general buildingl specs.docrev1

7/31/2019 General Buildingl Specs.docrev1

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SPECIFICATIONS


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NATIONAL IRRIGATION COMMISSION

Port Royal Fishing Village

Civil Works ConstructionContract #

SPECIFICATIONS

1. PRELIMINARIES

General 1.01 The Works to be executed under this contract shall be in accordance with the

Description General Conditions of Contract, this Specification and Drawings or details as may be

Of Work furnished or approved in writing by the Engineer and shall include the construction of a

fishing village including gear and mending sheds and sanitary facilities.

Contract 1.02 The Drawings forming the Contract Drawings are:

Drawings - Drawings issued by the Engineer from time to time as the work proceeds in

accordance with the Conditions of Contract.

- The Contractors Drawings approved by the Engineer in accordance with the Conditions

of Contract.

Position 1.03 The structures and other works are as may be shown on

Of Works the Drawings but the precise positions, lines and directions of the works are not necessarily

indicated and will be determined by the Engineer or Engineers Representative as the

Contract proceeds.

Site 1.04 The Site as defined in Clause 1 (I) of the General Conditions shall

mean the minimum extent of such private and public lands as in the opinion of the Engineer

is necessary or practicable for the construction of the Works. The Contractor shall make a

record to be agreed by the Engineers Representative of the condition of the surface of the

Site immediately before entering them for the purpose of constructing the Works. The

Contractor shall use the Site only for the construction of the Works.

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Site 1.05 The Employer will serve the necessary notices to permit the Contractor to erect

In Private the works in private land in accordance with the approved Contractorsprogramme and

Land the Contractor shall not enter on those lands until given permission in writing by the Engineers

Representative. The Contractor, if directed by the Engineer or Engineers

Representative, shall temporarily fence the site where the Works are to be constructed to

the satisfaction of the Engineer and the Contractor shall confine all works, plant, labour,

materials and transport within the site so fenced.

Site 1.06 Information regarding the nature of the ground and sub-soil at the site and the

position of pipelines and services may be indicated on the drawings or obtained from the

Engineer or Engineers Representative. The accuracy and completeness of such

information cannot be guaranteed and does not relieve the Contractor of his obligationsunder Clause 11 and 12 of the General Conditions.

Traffic 1.07 The Contractor shall provide traffic control and warning notices and lights as

Control& may be required by the Police and the Authority having charge of road surfaces

Warning across, alongside or adjacent to which the Works are to be constructed.

Notices

Roads to be 1.08 The Contractor shall ensure that all roads used by him are kept free of dirt

KeptClean resulting from his operations. Where roads become thus dirtied the Contractor shall take

all necessary steps to clean them.

Sanitary 1.09 The Contractor shall provide, erect, move when necessary and remove on the

Huts completion of the Works, suitable sanitary accommodation for the use of all persons employed on

the Works. Such accommodation shall be provided as and when the Engineer may direct,

and shall comprise enclosed pail privies and urinals of the Elsan type, which shall be

regularly cleaned out and disinfected together with the ground around them. They shall

be maintained in a proper and sanitary condition during the period of use and the ground

around them, together with that which they have occupied, shall be made good when they

are removed.

All sanitary conveniences provided, their maintenance and the disposal of material from

them, shall comply with the requirements of the local Parish Council. Similar facilities

shall be provided by the Contractor for the exclusive use of the Engineers Representative.

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Water for 1.10 The Contractor shall make all necessary arrangements to provide water formixing

Use inthe concrete and mortar and for any other purpose of the Contract.

Works

Loading of 1.11 No load of any kind shall be applied to any structures until the concrete has

Structures matured for at least 14 days except where otherwise approved by the Engineer.

Protection 1.12 The Contractor shall take every care to prevent damage to the Works and shall

Of Finishes ensure that adequate protection is given to all works from the activities of following trades

and nominated sub-contractors. Vulnerable parts of the Work particularly liable to damage

shall be protected as may be reasonably required by the Engineers Representative.

Electricity 1.13 The Contractor shall make his own arrangements for the supply of electricity to the

Supply for the purpose of the Contract.

Maintaining 1.14 The Contractor shall be responsible for maintaining all surface water ditches and

and drains, water pipes, electricity and telephone services and structures encountered during

Supporting construction of the works and for any remedial measures necessary to make good any

Other damage arising out of the construction of the Works. He shall temporarily support or divert

Services and subsequently reinstate all such services and structures to the satisfaction of the Engineer and

the appropriate authority. When permanent diversion of services is necessitated by the

construction of the Works, the Contractor shall obtain estimates for the carrying out of this

work by the appropriate authority and he shall be responsible for payment of all bills

presented by the Authority for this work. The Contractor will be entitled to recover these

sums from the Employer and an item has been included in the Bill of Quantities to cover

these payments.

Additional 1.15 In the event of the Contractor making use of additional Accommodation

Accommo- including wayleaves and tips for the disposal of surplus materials as set out in Clause 42

dation of the General Conditions he shall obtain and forward to the Engineer a copy of the

written consent of the owner occupier or Authority having charge of the land in which

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such accommodation, wayleaves or tips are situated and shall make a record to be agreed by

the Engineers Representative of the condition of the surfaces of the land before entering

thereon. The Contractor will not be permitted to occupy the space in public roads or

thoroughfares except with the written consent of the Engineer which consent will not be

given unless the Contractor shall have first obtained the consent of the Highway Authority.

Marginal 1.16 Marginal Headings in the Specification shall not be deemed to limit the working

Headings contained therein to any section of the Works and shall not be taken into consideration in

the interpretation of the Contract Documents.

Offices 1.17 Where ordered by the Engineer, the Contractor shall provide one

(1) portable Inspectors cabin for the exclusive use of the Engineers Inspector having not less

than 100 square feet of floor space and shall for the duration of the Contract maintain,

cleanse and light the same. The cabin shall be provided with a wash hand basin and stand,

supply of water and clean towels, a writing table, chairs, drawing bench. The cabin shall be

located where directed by the Engineer and shall be moved by the Contractor to new

locations as and when directed.

Hutments 1.18 The Contractor shall provide and maintain at the site suitable and sufficient shelters

For and mess rooms for his workmen and supervisory staff as are customary and necessary.

Workmen

First aid 1.19 The Contractor shall provide and maintain in easily accessible positions of the works

Outfits adequate first aid outfits for the duration of the Contract.

Assistance 1.20 The Contractor shall place at the disposal of the Engineers Representative one

to the competent chainman at any and all times to assist him in checking, setting out, leveling and

Engineer measuring up work together with all necessary pegs, ranging rods and all other apparatus.

Should additional assistance be required from time to time in the carrying out of the above

duties by the Engineers Representative the Contractor is to provide this assistance as and

when requested by the Engineers Representative.

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Instruments 1.21 The Contractor shall make available to the Engineers

for the Representative, as part of this Contract such other instruments and

Engineers personnel as may be required from time to time by the Engineers

Rep. Representative. All instruments shall be of modern type in first class condition and to the approval

of the Engineer and shall be maintained and insured by the Contractor.

Materials 1.22 Schedule No. 4 contains details of materials to be supplied by the

Supplied Employer at Stores/Warehouses/Storeyards situated in

by (not/applicable).

Employer These materials will be issued to the Contractor at the commencement of the work and he

will be required to take delivery in full within two weeks after the official starting date of

the Contract and make his own arrangement for storage. The Contractor shall comply with

any regulations issued by the Employer to ensure the safe and orderly working of the

warehouse/storeyard. The Contractor shall examine the materials in the

warehouse/storeyard before accepting responsibility for and loading them and any damaged or

defective materials shall be rejected and will be replaced by the Employer. Any damage to

the internal or external protective coatings shall be agreed with the Engineer before taking

responsibility for and loading the materials. Any damaged materials discovered thereafter

will be the Contractors responsibility and shall be repaired or replaced at his expense asdirected by the Engineer.

Datum 1.23 All levels are to Survey Department Datum, unless otherwise advised.Where

Level directed by the Engineer, the Contractor shall be required to establish sufficient approved

temporary bench marks for use during construction. The Contractor shall be responsible for

maintaining these temporary bench marks during the course of construction.

Wayleaves 1.24 Where the Employer has obtained wayleaves for the purpose of constructing

pipelines these will in general include a 10 wide permanent wayleave and an additional 20

temporary wayleaves for construction purposes.

Any temporary access tracks constructed along wayleaves are to be carefully designed and

maintained to avoid the concentration of stormwater run-off and adequate provision must

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be made for the safe disposal of any stormwater run-off. Before any temporary access

tracks are removed the Engineer must be consulted as the Employer may wish to negotiate

the retention of these tracks with the Landowners.

Precautions 1.25 The Contractor shall at all times makes measures to avoid contamination of

Against existing water coursed and drains by petrol, oil or other harmful materials. The Contractor

Contamination shall be responsible for making all arrangements for the disposal of wastewater, including

the disposal of water from the testing of mains and water retaining structures.

Contractor 1.26 The Contractor shall keep the Engineers Representative informed, in advance, of the

tokeep times and places at which he intends to work in order that inspection may be provided,

Engineer and that necessary measurements for record and payment may be made with the minimum

informed of inconvenience to the Engineers Representative or of delay to the Contractor (See the

Conditions of Contract with respect to night and Sunday work).

2. MATERIALS

Materials 2.01 Any materials supplied by the Employer will be to the Specifications

Supplied contained in the relevant materials list, or to specifications which are at least

bythe equal.

Employer

Any other materials not supplied by the Employer but necessary to complete the Works

shall be furnished and installed by the Contractor.

Materials 2.02 All materials supplied by the Contractor for use in the execution of the Works shall

Supplied comply with the appropriate British or American Standard and the particular requirements

By the set out in the Specification and in the Bill of Quantities or as instructed by the Engineer.

Contractor Whenever required by the Engineer, the Contractor shall deposit free of charge at the

Engineers Office or an approved materials testing laboratory in Kingston samples of the

materials that he proposes to incorporate in the Works. The approval of the Engineer to the

sample submitted shall be obtained before any such materials are brought to the site and the

whole of the materials delivered to the site for use in the Works shall be equal in every

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respect to the approved deposit samples. Samples of materials to be used as aggregate shall

be taken and tested in accordance with the provisions of B. S. 812, 1975.

No materials of which samples are required shall be used until such samples have been

approved, in writing, by the Engineer.

Portland 2.03 All cement used on the Works shall be ordinary Portland Cement froman

Cement approved source, and shall comply with the requirements of B. S. 12, 1958, or to ASTM Standards

if imported.

Unless approval is given for the handling of cement in bulk all cement shall be delivered in

sound and properly secured bags, and shall be stored in a dry weatherproof shed with a

raised wooden floor, or other building approved by the Engineer.

Cement shall be delivered in quantities sufficient to ensure that there is no suspension or

interruption of the work of concreting at any time and each consignment shall be keptseparate and distinct. Cement shall be used as soon as possible after delivery and shall be

so stored that it can be used in the order in which it is delivered. Any cement which shall

have become injuriously affected by damp, or other causes, shall at once be removed from

the site immediately. Any packages in which there are hardened lumps or cakes of cement

shall be rejected.

The Contractor shall furnish as directed by the Engineer, test certificates relating to the

cement used on the Work. Each certificate shall indicate that the sample has been tested

and analysed by an approved firm and that it complies in all respects with the requirements

of the appropriate Specification for the particular type of cement.

Coarse 2.04 Coarse aggregate for concrete shall consist of nonporous crushed stone or gravel and

Aggregate shall comply with, and be graded in accordance with B. S.882, 1965. Limestone aggregate

will only be acceptable if of a hard crystalline variety with absorption of less than 4% when

tested in accordance with B. S. 812, 1975. Coarse aggregate for all grades shall be in

accordance with Table 1 of B S. 882, 1 -3/16, -3/16 graded aggregate.

Aggregate shall be delivered to the site in two separate graded ranges, unless otherwise

authorised by the Engineer.

Fine 2.05 The fine aggregate (sand) shall be natural sand complying with B. S. 882, 1965

Aggregate for fine aggregate Class A Table 2 Grading Zones 2 or 3.

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Storage of 2.06 All aggregates brought upon the site shall be kept free from contact with deleterious

Aggregate matter and shall be stored in free-draining concrete hardstandings or in bins. Aggregate of

different sizes shall be stored in different piles or bins.

All aggregate which do not comply with B. S. 882, 1965, shall be removed immediately

from the site.

Water for 2.07 Water to be used with cement must be from an approved source and shall be free

Works from salt, oil, alkali, organic matter and other deleterious substances.

Steel 2.08 The mild steel reinforcement shall consist of deformed mild steel reinforcement bars

Reinforce- complying with ASTM A615, Intermediate Gradeor equivalent. Reinforcement shall be

ment stored under cover and supported clear of the ground in such manner as to make identification

easy, to avoid distortion, and to prevent contamination and corrosion.

Cement 2.09 Cement mortar shall consist of one part by volume of Portland Cement and two,

Mortar three or six parts by volume (as specified elsewhere) or natural sand or crushed natural stone or a

combination of both as specified in B. S. 1200, 1955. The constituent materials shall be

accurately gauged and mixed in an approved manner.

Cement mortar shall be made in small quantities only as and when required and any mortar

which has begun to set or which has been mixed for a period of more than thirty minutes shall be

rejected.

Hollow 2.10 Hollow concrete blocks shall be of Portland Cement and suitable aggregate

Concrete manufactured to the requirements of Jamaica Standard No. 35, 1975 (Class A) or equivalent

standard.

Blocks

Manhole 2.11 All manhole covers and frames shall conform to B. S.497, 1967, and shall be Grade

Covers & A(heavy duty) unless otherwise stated. Clear openings shall be as indicated on the

Frames drawings.Two sets of manhole keys shall be provided.

Timber 2.12 All timber on the Works shall conform to B. S. 1186 and shall be wolmanised.

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3. CONCRETE WORKS

General 3.01 The standard of materials and of workmanship for the construction of all concrete

structures in the Works shall meet the requirements of the Engineer.

No material shall be used in the Works until prior approval for its use has been given by the

Engineer; neither shall any change in the nature, quantity, kind, type source of supply or

manufacture be made without the Engineers permission.

Water 3.02 The Contractor shall supply all water, make all arrangements and pay all charges

in respect of such supply. Where water can be obtained from a public water supply it shall

be used.

Concrete 3.03 No concrete additives shall be used in the Works unless prior approval is given by

Admixtures the Engineer.

Shuttering 3.04 The term Shuttering shall be taken to include centering, formwork strutting,

bracing and the like.

All shuttering shall be sufficiently tight without plugging, to prevent loss of grout during

vibration of the concrete. Shuttering, which as a result of prolonged use or general

deterioration does not, in the opinion of the Engineer, conform to the particular

requirements set out in this Clause, shall not be used.

Boxes for forming holes shall be constructed so as to be easily removable without damaging the

concrete on removal.

Type of shuttering shall, unless otherwise specified, fall into the following categories:-

Sawn Shuttering Sawn shuttering shall produce an ordinary standard of finish consistent with

normal good practice for use where the face of the finished concrete will not be

exposed. The facing in contact with the concrete shall consist of sawn timber

boards sheet metal or other approved materials.

Wrought shuttering shall produce a high standard of finish consistent with the best

practice for use where the face of the finished concrete is to be exposed. The

facing in contact with the concrete shall consist of wrought and thicknessed boards

tongued and grooved of not less than 1 finished thickness, framed plywood or

metal panels or other approved materials.

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Where timber is used for shuttering it shall be properly cured; free from warp,

straight, clean and free from loose knots.

Where metal forms are used for shuttering they shall be of the type strengthened

by intermediate ribs or cross bracing.

Holes 3.05 Holes, etc., shall be accurately marked and boxed-out for before concreting

Cavities & operations commence and without the Engineers prior approval, no such holes, etc.,

Fixtures shall be formed after the concrete has set.

Wherever possible, the Contractor shall build in all pipework, which passes through walls

and floors, and the pipework, shall first be thoroughly cleaned and freed from any

deleterious matter, and every care shall be taken to ensure that it is thoroughly encased in

concrete.

Cutting, 3.06 The Contractor shall provide on site facilities for cutting Placing and bending

And reinforcement. Reinforcement shall be wire brushed and cleaned at the Contractors

Bending, expense, before and/or after it is placed in position, if required by the Engineer.

Placing & The bars shall be cold bent in strict accordance with the bending schedule and the

Fixing of Contractor shall be responsible for the accuracy of the bending.

Reinforce- Any discrepancy or inaccuracy found in the bending schedule shall be notified to the

Ment Engineer immediately.

Before assembling or placing the reinforcement the dimensions to which it has been bent

shall be checked with the bending schedules by the Contractor.

The reinforcement shall be fixed in strict accordance with the drawings are regards cover,

spacing and position, and suitable precautions shall be taken by the Contractor to prevent

the displacement of reinforcement during the placing and compaction of concrete.

A lap of not less than forty diameter of the smaller bars shall be provided at the junction of

two bars for which the lap is not specifically detailed on the drawings.

All intersections of bars in walls and slabs shall be tied with soft iron wire ties or with

fixing clips, which shall not be allowed to make contact with the shuttering or to project

materially into the specified cover.

Unless permitted by the Engineer, welding of bar reinforcement at intersections or for the

jointing of bars is prohibited.

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Composition 3.07 The finished concrete shall be dense, durable impervious, free from cracks

& and honeycombing, resistant to wear and mild chemical attack.

Manufacture

Grade

of Concrete All concrete must be mixed in the following proportions for various grades of concrete

shown on the drawings or described in the Specifications and must produce minimum

compressive strengths stated for each grade:

Grade

Mix

Minimum Compressive Strength

of Cubes at Age 28 days p.s.i.

A

B

C

D

1:1 1/2:3

1:2:4

1:3:6

1:4:8

3600

3000

2000

--

The water content of all classes of concrete shall be rigidly controlled and shall be kept to a

minimum having regard to the nature of the work to be executed. In general the slump, as

measured by the standard consistency test, shall not exceed 50mm unless exceptional

conditions so demand and approval is given by the Engineers Representative.

Batching and Mixing

Aggregate and cement shall be proportioned by weight-batching and water shall be

proportioned by volume unless otherwise agreed with the Engineers Representative.

Unless otherwise specified by the Engineer, concrete used in the Works shall be batch

mixed with suitable equipment but may for small volumes be hand mixed. In such cases,

the cement content for all mixes shall be increased by 10% and the Contractor shall allow

for this in his rates and prices. Where concrete is mixed by hand, the find aggregate and the

cement shall be thoroughly mixed first, and the coarse aggregate added. Mixing in the dry

shall be carried out at least twice and then water shall be added and the concrete again

thoroughly mixed.

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Concrete Tests

Concrete tests shall consist of consistency tests and cubes tests as detailed in B. S. 1881,

and as further detailed hereinafter.

When required by the Engineers Representative the Contractor shall prepare two sets of

not less than three 6 inches test cubes of concrete taken from the normal place of deposit of

the concrete which is being incorporated in the permanent work. The preparation of these

cubes shall be in accordance with B. S. 1881 and the entire operation shall be supervised by

the Engineers Representative and the Contractors foreman.

For each sample cube taken the Contractor shall record the information called for in B. S.

1881, Part 3, and a copy shall be submitted to the Engineers Representative. The cubes

shall then be cured as specified in B. S. 1881 and after 7 days and 28 days respectively, the

two sets shall be tested for crushing strength by an independent Testing laboratory in

accordance with B. S. 1881. It is particularly important that a consistency test be made on

the concrete used for test cubes and the result thereof sent, with the test cubes, to the testinglaboratory.

When the Engineers Representative requires the laboratory shall be instructed to report on

the density of the concrete and additional cubes shall be prepared for this purpose if

necessary.

Minimum Compressive Strengths shall not be less than those specified above.

The Contractor shall be responsible for conveying the cubes to an approved testing

laboratory and the Employer shall be responsible for the fees for testing.

All tests prepared or carried out on the site of the Works shall be supervised by the

Engineers Representative and the Contractor shall provide the necessary facilities labour

and materials for all tests and include them in his prices for concrete.

The Contractor shall provide and maintain sufficient standards moulds for 150 mm test

cubes, sieves, scales, slump cones, puddling rods, approved apparatus for

ascertaining quickly the water content of fine aggregate, and any other apparatus required

for the performance of the tests as hereinbefore specified.

All accuracy of all such apparatus shall be proved to the satisfaction of the Engineers

Representative before the commencement of the Works and at intervals thereafter as

required.

Transport 3.08 Concrete shall be transported as soon as possible after mixing, by approved methods

Of concrete which will prevent the segregation, loss or contamination of the ingredients.

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Placing 3.09 No concrete shall be placed until the Contractor has obtained approved to do so

And from the Engineers Representative. When the Contractor intends to place concrete he

Compaction shall inform the engineers Representative in sufficient time to enable him to inspect

Of concrete the reinforcement, shuttering and surface on which the concrete is to be placed and the

Contractor shall provide all facilities for such inspection.

Concrete shall be placed within 30 minutes of mixing in such manner as to avoid

segregation and shall be compacted by means of approved vibrators to form a dense

material free from honeycombing and other blemishes. Compaction by hand may be used

only with the prior approval of the Engineer.

Concrete shall only be place on surfaces prepared to received it. Reinforced concrete shall

only be placed on formwork or on 1:3:6 concrete laid on the ground as blinding 75mm

thick or as shown on the drawings.

Protection 3.10 Newly-placed concrete shall be protected by approved means from rain, drying

and Curing winds, sun and contact with substances which can adversely affect it.

of concrete No traffic or constructional loads shall be permitted on new-placed concrete until it has

hardened sufficiently to take such traffic or load without surface damage or deformation.

Striking and 3.11 Unless otherwise specified by the Engineer, the striking of time of all shuttering

Removal of shall be 7 days. Any other information regarding striking and removal of shuttering shall

Shuttering be obtained by the Contractor from the Engineer.

Finishes 3.12 All exposed faces of concrete unless otherwise specified shall be hard, smooth and

To free from honeycombing, air and water holes and other blemishes.

Concrete Honeycombing or damaged surfaces of concrete, which in the opinion of the Engineer, are

not such as to warrant the cutting out and replacement of the concrete, shall be made good

as soon as possible after removal of the shuttering as follows:

1:11/2 Portland Cement and sand mixture shall be worked into the pores over the whole

surface with a fine carborundum float in such a manner that no more materials is left on the

concrete face than is necessary completely to fill the pores so that a uniformly smooth and

dense surface of uniform colour is finally presented.

Removal and 3.13 The Contractor shall on the Engineers instructions to do so, cut

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Replacement out and replace any concrete in any part of the structure if in the Engineers

opinion:

Of (a) The concrete does not conform to the Specification, or

Unsatisfactory (b) Deleterious materials or materials which are likely to produce harmful

Concrete effects have been included in the concrete, or

(a) The honeycombing or damaged surfaces are too extensive, or

(b) The finished concrete sizes are not in accordance with the

Drawings within permissible tolerances, or

(c) The setting-out is incorrect, or

(d) The steel cover has not been maintained, or

(e) The protection, including curing, of the concrete during the

construction was inadequate, resulting in damage, or

(f) The work of making good or other remedial measures the

Engineer may indicate are not carried out to his satisfaction, or(g) Undue deformation of or damage to the Works has taken place

due to inadequate shuttering, or to premature traffic and

loading, or

(h) Any combination of the above points has taken place resulting

in unsatisfactory work.

Ready- 3.14 Ready-mixed concrete shall only be used with the prior approval of the Engineer.

MixedThe Contractor shall not be relieved of his obligation to provide concrete to the standard

Concrete laid down in this Specification, by virture of any approval given for the use of concrete

supplied by others, and the Engineer reserves the right to withdraw his approval at any time

consequent on any deterioration in the quality of the concrete, or unsatisfactory delivery of

any other reason he considers detrimental to the Works.

Precast 3.15 Precast concrete units shall be of approval manufacture or shall be

Concrete obtainedfrom an approved manufacturer and shall be true to dimensions and

Units shape, with true arrises and with perfectly smooth exposed faces free from

surface blemishes, air holes, crazing and other defects, whether developed before

or after building-in.

Cement 3.16 The cement mortar shall consist of cement and graded sand as specified,

Mortar gauged by volume in wrought boxed in the proportions stated hereafter:

Cement Mortar shall consist of:

Proportions by Volume

Portland Cement Sand

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Mortar No. 1 1 3

Mortar No. 2 1 2

Mortar No. 3 1 1

The cement and sand shall be mixed together dry on a clean wooden stage until the mix is

perfectly homogeneous in colour. Water shall then be added through a hose in quantity

sufficiently to give no more than a stiff workability and the mixture shall then be turned

until perfectly even consistency is obtained.

Mortar shall be used within 15 minutes of being mixed and shall not be re-mixed or worked

up again after it has stiffened by initial set. Any mortar that has commenced to set shall be

removed from the Works.

Cement 3.17 Any cement rendering shall be laid in two or more coats, each coatconsisting of

Rendering Cement Mortar No. 1. The total thickness of rendering shall be as shown onDrawings or as specified. The number of undercoats and the thickness of undercoats and

finishing coast shall be as approved by the Engineers Representative subject to a minimum

thickness for any coat of a quarter of an inch.

The surface of the work to be rendered shall be thoroughly prepared before the undercoat is

applied by hacking the surface of the concrete or raking out joints in the blockwork to a

depth of three-quarters of an inch to form an efficient key for the rendering, by thoroughly

brushing down the surfaces to clean off all dust and loose material and finally by

thoroughly soaking the surface with water for at least 24 hours prior to rendering and the

cost of this preparation shall be included in the price for rendering.

Each coat shall be thoroughly rubbed down with a trowel whilst still in a plastic condition

well scored to form a key and soaked with water for 24 hours prior to laying on a

subsequent coat.

The finishing coat shall be float finished to true planes and regular curves and to a polished

surface. All arrises shall be rounded and lineable and a hollow fillet shall be run at all

angles.

The subsequent coat shall be applied as soon as practicable while the previous coat is still

green and in no case shall more than three days elapse between application of one coat and

its being covered up with another coat.

The finished rendering shall be watered at frequent intervals, covered with hessian, and

kept thoroughly damp for a period of at least fourteen days after completion.

Any rendering found to be hollow or in any other way defective shall be taken down and

made good at the Contractors expense, all to the approval of the Engineer.

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Cement 3.18 All cement grout used for filling holes and pockets for fixing bolts, bedding

Grout penstocks, etc., shall consists of cement Mortar No. 3 and shall be thoroughly mixed with

just sufficient water to give the mixture the necessary fluidity to enable it to be poured into

position and to completely fill the cavities concerned.

Concrete 3.19 The blocks shall be precast hollow blocks of concrete B obtained

Blockwork from an approved manufacturer. The gross size of the blocks shall be 16 x 8 x 7 .

The sizes of the blocks shall be such as will provide a good key for plastering or rendering.

The mortar to be used for bedding the blocks shall be composed of Portland Cement and

sand 1:3 (Mortar No. 1).

The blocks shall be laid in stretcher bond with longitudinal half Bond preserved throughout.

Joints shall not exceed . The blocks shall be set so as to rise 2 feet in three courses. The

blocks shall be well wetted before laying and the cavities filled with concrete B.

Vertical reinforcement of one diameter rod shall be provided at 16 centres with the rods

carried through into roofs or beams where such are shown on the drawings. Horizontal

reinforcement of two diameter rods shall also be provided to alternate courses. The

horizontal reinforcement shall wherever possible be extended to bond together at corners

and junctions. The rates for block laying shall include for reinforcement forming all

openings reveals and angles as shown on the drawings, all necessary cutting and building in

of brackets, etc., making good and all other matters, any trade custom to the contrary

notwithstanding.

4. EARTHWORKS

(A) EXCAVATIONS

Stripping 4.01 Before commencing any excavation where directed by the

Surface Engineer, the surface material and foundation thereto shall be

Materials carefully excavated including breaking out as necessary to construct the works

and set aside for re-use as specified therein or as directed by the engineer. In

cutting or breaking up street or other surfacing, the Contractor shall not use

equipment which damage the adjacent pavement. All asphalt surfaces shall be

scored to a minimum depth of 4 with asphalt sawing equipment of a type

meeting the approval of the Engineer or by other approved means.

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Excavation 4.02 The Contractors rates for excavation will be deemed to include for

Generally excavation in any materials and for keeping the excavation free of water, unless

otherwise stated in the Bill of Quantities.

Any excavated material stored temporarily on site for any purpose shall be

deposited in such a manner that no damage and as little inconvenience to the

public as possible is caused.

Any surplus material resulting from excavating is to be disposed of either on

site as indicated from time to time by the Engineers Representative or in tips

to be provided by the Contractor off site.

No peat is to be used as back fill, and all peat and peat contaminated material is

to be treated as surplus materials.

If any additional back fill material is required, this material is to

be imported to the site, and is to be used for the top layers or

filling.

All excavation shall be in open cut, unless other methods are specified

or have prior approval of the Engineer.

The Contractor shall provide, place and maintain all supports and shoring that

are necessary for the safety of the excavation and the workmen and shall

provide, install and maintain all necessary pumps, ditches, etc, which are

required to remove or exclude water from the excavation in accordance with

the Specification.

The Contractor shall draw the attention of the Engineers Representative to any

patches of soft ground in the bottom of excavations and shall excavate to such

extra depth as the Engineer may direct and refill with 1:4:8 concrete or

compacted selected granular fill to the approval of the Engineer.

Excavation 4.03 The Contractor shall plan and carry out his operations such that all

In Roads roads, junctions and entrances are kept open at all times.

Construction equipment shall not be parked, or in case of breakdown shall not be

allowed to remain, in such a position as to hinder the free flow of traffic.

Excavation 4.06 Rock shall be defined as hard material that cannot be dug, be backhoe or

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in Rock cannot be ripped by a D6, or lighter with a single ripper.

Payment for excavation in rock will only be made when the Engineers

Representative is satisfied that excavation was carried in rock, respectively,

regardless of the method of excavation used.

Where excavation is billed as in any material no payment will be made for rock

and the Contractor will be deemed to have included such allowance for rock

excavation as he considers necessary.

Blasting 4.07 Explosive shall not be used on the construction of any portion of the works

unless the permission of the Engineer has been obtained in writing. Such

permission shall not be unreasonably withheld. Blasting will not be permitted near

buildings, bridges or culverts.

Where permission to use explosives has been given, the Contractor shall be

responsible for obtaining information as to any restrictions or objections to

blasting. The Contractor shall also obtain all necessary licences and shall provide

a properly secured store for the explosives in accordance with the statutory

requirements and to the approval of the police and he shall give facilities to any

authorized person to inspect the store from time to time.

Blasting operations shall be carried out under the supervision of a skilled foreman

and watchman provided with red flags shall be employed at sufficient distance and

in such directions as may be necessary to warn persons and traffic that such

operations are being carried out. The Contractor shall give due warning of the time

blasting is to be carried out to all persons liable to be affected and where blasting

is to be carried out in the public highway the police are to be so informed.

The Contractor shall carry out blasting operations in such a manner as not

to cause injury or damage to any person, animal or property and he shall

provide and ensure the use at all times of sufficient shields, screens or

matting to prevent rock, stones, earth, debris, or other materials from

being blown from the excavation.

The Engineers permission for blasting will only be granted if evidence of adequate blasting

insurance is produced for inspection.

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Support of 4.09 The Contractor shall provide the necessary support or excavations. If in

Excavation the opinion of the Engineer, the support proposed by the Contractor is

insufficient, then the Engineer will order the provision of stronger support,and in this event, the Contractor shall modify his proposals to the

Engineers satisfaction at no extra charge.

The Contractor shall not remove temporary works supporting the

excavations until in the opinion of the Engineers Representative the

permanent work is sufficiently advanced to permit such removal,

which shall be carried out under the personal supervision of competent

foreman.

Any device, permission, approval or instruction given by the Engineer or Engineers

Representative relative to such support or removal thereof shall not relieve the

Contractor from his responsibility under the Contract.

Other Methods 4.10 The Contractor shall, where shown on the drawings detailed in the

Of Excavation specification or instructed by the Engineer on the site, make excavation

by tunneling, boring, or any other methods so detailed or instructed.

Prior to carrying out any excavation by any other method than open-

cut the Contractor shall submit to the engineer detailed drawings and

descriptions as to how such excavation is to be carried out and no such

excavation shall be carried out until the method has been approved by

the Engineer.

The Contractor shall keep correct lines and grade while excavating by any

tunneling or boring method, shall provide adequate timber, concreteor metal

supports for protection of workmen and in all matters regarding the safety of

the excavation be governed by both the regulations of the Authorities having

jurisdiction and the requirements of Engineer.

Excavation 4.11The Contractor shall keep all excavations free from water and sewage so

to be Kept that the works shall be constructed in dry conditions, and shall continue

Freeof water to keep the level of water or sewage at a level lower than the bottom of

the permanent work for such a period as the Engineers Representative

shall direct.

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Should the Contractor require drainage channels or sub- drains, the

Engineer will permit the construction of these below the level of and

within the width limits of the permanent work provided detail of the

Contractors proposals have first obtained his approval.

Any sub-drainage constructed by the Contractor below permanent works shall

if left in place be made to provide support at least equal to that of the original

foundation. Ballast filled sub-drains under permanent in situ concrete shall be

covered with a waterproof membrane.

No sub-drainage pipes shall be left in unless they are filled with 1:4:8 concrete

or other approved filling.

No water shall be discharged into any water course or sewer including sewers

and drains laid under the Contract unless the Contractor has first obtained allnecessary consents and permission in writing from the Engineer. Such

permission will not be granted unless the Contractor shall have provided to the

satisfaction of the Engineers Representative an effective settling basin or sand

trap through which all water shall be passed before discharge to water courses

or sewers.

Existing 4.12 Existing surface or underground utilities, such as power lines, overhead

Utilities wires, cables, pipelines, etc., are expected to be within the construction

are of the works. The Contractor is directed to carefully examine the

location of utility and other structures in the area, and avoid damage or

interference of these during construction of the works or any Temporary

Works.

All existing underground utilities which are encountered during excavation

operations must be protected from damage maintained in accordance with the

Specification during excavation and backfill operations.

At utility crossings, the Contractor shall excavate and remove all material from

within one foot of the intersecting utility. The Contractor shall then rebed in the

existing utility with approved granular material compacted in four inch layers in

such a way as to provide a uniform and continuous bearing for boththe existing

utility and the new pipe over the whole length of the disturbance.

The quantities of excavation, filling and ramming, wheeling, spreading and

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levelling surplus excavated material are calculated from the net measurements

before excavating and the Contractor shall make allowances, in his rates for

increases in bulk.

The rates for excavation shall include for excavating in whatever nature of

ground may be found to exist, removing stones boulders, tree roots up 150mm

(6) diameter and any other obstructions encountered.

The rates for filling and ramming, for wheeling, spreading and levelling or

grading and for disposal of surplus excavated materials shall include for any

double handling required.

Whenever excavations are carried to greater depths than are shown on the

drawings (including uneven bottoms or soft spots) they shall be filled to the

proper level with broken stone or gravel for non-bearing lightweightstructures or with concrete under load bearing footing carrying concentrated

loads.

The rates for excavation shall include for ramming all bottoms before any

concrete is placed. the bottom and sides of excavations for foundations

including tie beams shall be carefully cut so that when foundation

reinforcement is placed the correct concrete cover is allowed to the bars.

The sides of the excavation if necessary shall be timbered and shored in such

a way as to be sufficient to secure them from falling in, and the timbers shall

be maintained as long as necessary. Prices shall include for any necessary

timbering and shoring of excavations.

EXCAVATIONS 4.13 The whole of the excavations shall allow in his prices for

TO BE KEPT providing allpumping, baling, temporary drains and cuts

FREE FROM required for this purpose.

WATER

BACKFILLING 4.14 In filling around foundations and to make up levels, approved

AND FILLING material arising from the excavations may be used, (providing

TO LEVELS it is free from vegetable matter) and to the approval of the

Engineer.

No backfilling shall be done until all formwork, bracing, etc., has been

removed and the work inspected and approved by the Engineer.

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Material softer than the adjoining soil shall not be used for backfill. All

backfill shall be applied in layers not exceeding six inches and properly

tamped and compacted including watering.

SURPLUS 4.15 All surplus excavated material is to be deposited, spread andEXCAVATED levelled where directed or removed from the Site. The rates for

MATERIAL removing surplus excavated material from the Site shall include

for carting and depositing for a tip to be found by the Contractor, and

for any fees and charges in connection therewith.

FILL

Rock chips removed during the excavation may be re-used as fill

provided they form clean, sound and hard material of varying sizes

capable of being compacted by rolling .

All fill brought to the Site must be clean, sharp, river sand or broken

stone of varying dimensions.

All fill shall be placed in layers on greater than inches in depth.

APPROVAL 4.16 The Contractor shall inform the Engineer when excavations are

OF ready to receive concrete. No concrete shall be placed in

EXCAVATIONS foundations until the excavation has been inspected and

approved by the Engineer.

HARDCORE 4.17 The hardcore is to be composed of approved hard bricks, old cement

concrete hard tile stone, stone ballast or other hard substances of

approved quality all to be broken to suitable sizes and well rammed and

consolidated and where laid to receive concrete to be blinded with approved

hard, clean, fine material, free from earth or vegetable matter.

PRE-CONSTRUCTION 4.18 The material to be applied is to contain 42.8%

SUBTERRANEAN Chlorpyrifos and water at 1% finished emulsion i.e. 2

TERMITE gallons concentrate to 98 gallons of water (or equivalent

TREATMENT pesticide). Application to produce a vertical barrier should be at a rate 4

gallons per ten (10) linear feet (ft)per foot (ft) of depth (10) square feet

(ft). For hollow block foundations apply at a rate of two gallon of

emulsion per ten (10) linear feet (ft). The solution must be applied

strictly on accordance with manufacturers instructions. The solution

must be evenly applied and all surfaces completely covered.

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Application shall not be made when the surfaces, compacted hardcore,

marl, gravel, etc. or earth is excessively wet nor shall it be applied

immediately after heavy rain.

The Contractor will be required to provide a guarantee for a period of

three (3) years with prompt retreatment within ten (10) days should

there be signs of infestation after the building is constructed.

5 WALLING AND MASONARY

HOLLOW 5.1 The hollow concrete blocks shall comply in all respects with J.S. and

CONCRETE shall be Class A unless otherwise described.

BLOCKS

MORTAR 5.2 The mortar used for block laying shall be cement and sand (1:4).

All mortar shall be properly mixed upon a clean platform and shall be

used as mixed. No mortar which has been allowed to set shall be used in

the work.

LAYING 5.3 All blockwork shall be laid in stretcher bond, bedded, jointed, flushed up

inmortar and carried up regularly around the building. All blocks shall

bethoroughly watered before laying.

All reinforcement cavities above ground and all cavities blow ground

level shall be filled in solid with 1:3:6 concrete placed consolidated in

sections not exceeding 1200mm in height.

All concrete block units shall be wet immediately before being laid and

the effective shells and webs shall rest and align one over the other.

All work shall be frequently checked with levelling instruments, and all

angles reveals, etc. strictly true, square and plumb.

Reinforcement steel shall be placed as shown on structural drawings.

Where horizontal and vertical reinforcing bars cross they shall be wired as

described in 3.06 here to before. The horizontal joints shall be filled with mortar

to the full flushed extent of the bearing area of the units and the vertical joints

shall be thoroughly flushed with mortar. Minimum splice of all reinforcing.

The rates for concrete blockwalling shall include for special size blocks and

plumbing and bonding at all angles and intersections, cutting at all jambs and

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sills, cutting and fitting up top to concrete soffits, and for sealing tops and ends

of wall to receive concrete or render.

Where block walls are described as being built fair and flush pointed, prices

shall include for pointing as described on the Drawings or in the Bills of

Quantities and in the case of window and door jambs, for standard or special

sized blocks with fair ends.

All courses shall be laid perfectly level with joints of equal thickness and all

adjacent exposed faces laid flush with each other.

All courses shall be laid perfectly level with joints of equal thickness and all

adjacent exposed faces laid flush with each other.

LINTELS 5.4 All normal builders lintels shall be the same thickness as the wall andnotless than 200mm deep with not less than 200mm bearings at each end

andshall be reinforced with steel bars hooked at each and placed 25mm

abovetheir soffits as follow.

100mm Wide and under: 1No. 12mm diameter bar for clear spans up to

1200mm.

For lintels over 100mm wide and up to 200mm wide; 2 No. 12mm diameter bars

for clear spans up to 1200mm; 2No. 16mm diameter bars or 3 No. 12mm

diameter bars for clear spans up to 2100mm.

The Contractor shall refer to the drawings for reinforcement details of all

other lintels.

ENDS 5.5 All free vertical ends of walls such as window and door jambs to opening

shall be reinforcement with a rod of at least 10mm diameter placed not more

than 100mm from the edge.

FAIR FACE 5.6 Fair faced block walls shall be built from approved quality selected block

ofuniform colour and textures to comply in all respects with J.S. 35 and

shall beClass A unless otherwise described.

All courses shall be laid perfectly level with joints equal thickness and all

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adjacent exposed faces laid flush with each other. Properly calibrated courses

rods or templates shall set up at the ends of every panel of walling to facilitate

correct alignment of the block courses.

Unless otherwise described all pointing shall be carried out as the works

proceeds shall be slightly recessed, and finished to give half round

concave joints (bucket handle).

All excess mortar must be cleaned off before setting.

All external angles, reveals and jambs must be built perfectly square and

vertical.

Specially manufactured blocks with fair ends shall be used in these locations.

All sills must be built perfectly square and horizontal. Specially manufactured

6. CARPENTRY AND JOINERY

All Joiners work is to be wrot finished with clean smooth surfaces, clean

mirtes prepared in accordance with detailed Drawings and properly scribed

and fixed to position in the building. The joinery is to be framed and put

together as soon as possible after the commencement of the Contact, but not

glued and wedged up until the joinery is prepared in readiness for immediate

fixing. All framing is to be put together with well fittings mortice and tension

joints wedged up solid. all mouldings are to properly mitred at angles. the

glue is of the best and strongest quality and for external work shall be marine

glue.

All screw and bolt heads or nuts are to countersunk, and exposed nail heads

are to be driven home.

All glued joints are to be cross or feather tongued.

The prices for all items of carpentry and jointery shall include for all

notchings and halvings and for all necessary nails, screw, plugs, straps

anchors other fastenings to adequately secure the work subject to the approval

of the Architect. Fastenings in locations subject to wetting or high humidity

shall be of an approved corrosion resisting material.

The rates for jointers work shall include for rounded arrises as required. The

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rates for softwood skirtings, stop, architraves, fillets and brearer not exceeding

150mm in sectional area shall include for mitres, fitted ends, housings,

returned ends, notching and other sundry labours of a like nature.

Where wrot softwood is described as planted-in, nails are to be punched and

the holes stopped.

SIZES 6.1 All timber sizes, except where otherwise described are before planning,

3mmwill be allowed for each wrought surfaces from all specified

thickness.

FRAMES 6.2 Window, transome and door frames are to made up in accordance with

detaildrawings.They shall, unless otherwise shown, be fixed to jambs with hold

fasts located within 150mm of head and foot and at .090mm maximum centres

between.

Heads of frames exceeding 0.90mm in width shall in addition be screw fixed to

plugs at 0.90mm maximum centres, and the rates for frames shall allow for this.

DOORS 6.3 Flush doors unless otherwise detailed or described, shall comply with

J.S.72with four edges lipped and of internal or external quality

according tolocation. They shall be finished on both sides with plywood

of internal orexternal quality for painting or polishing as required and in

accordance withthe door schedule.

Doors shall be stored under protective cover away from dumped surfaces or

locations.

Doors shall be fixed by experienced workman and shall be fitted and

Hung with a clearance of 3mm at the bottom and 1.5mm at the top and

sides except where otherwise directed. Doors 45mm thick shall have the

lock edged bevelled 3mm.

FITTINGS 6.4 Rates shall include for all framed bearers, scribing, fitting and screw

fixing towalls (including rawl-plugged).

All wrot timber shall be rubbed down with three varying grades of sandpaper.

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All nail holes shall be stopped and the work left clean to receiving painting or

polishing.

PREPARATION 6.5 The rates for all wood work to be painted shall included for priming

beforefixing in position.

7. HARDWARE AND METALWORK

STRUCTURAL 7.1 N.B. The term the Contractor where used under this heading means the

STEELWORK steelwork Contractor.

STANDARD OF 7.2 The whole of the materials and whole workmanship to be employed on

MATERIALS the works shall be the best of their respective kinds obtainable locally

AND unless otherwise specified. The terms approved or selected shall

WORKMANSHIP mean approved of or selected by the Engineer.

STANDARD 7.3 All structural steel shall be type A36 new, conforming to the least edition

SPECIFICATIONS of the ASTM Standard Specifications or shall be mild steel conforming to BSS

4360 - latest edition.

High Strength both shall be to ASTM A325-61T and installed in

accordance with Specification for Structural Joints using ASTM A325-61T.

Fabrication shall be carried out in accordance with the best engineering

practice and shall comply with the latest relevant specifications of the AISC and

with BSS 449 (1959).

All welding electrodes shall comply with BSS 639 (1952) and welding shall be

carried out in accordance with B.S.5135.

All the Standard Specifications mentioned in this specification shall be

deemed to be part of it.

HANDLING 7.4 The Contractor shall be responsible for handling, unloading, sorting and

AT SITE stacking of his materials on site. He shall not stack materials where they

are likely to obstruct free access on the site or the work of others.

SUBSTITUTION 7.5 If materials specified on the drawings are not available, all alternative

OF materials must be approved by the Engineer.

MATERIALS

FABRICATION 7.6 Fabrication shall be carried out in accordance with the drawings

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and the specification listed above. In particular:

(a) BOLT HOLES

Provide bolt holes as may be required to secure window and /or

door frames and any special bolt holes as shown on the drawings.

(b) SHOP CONNECTIONS

Shop connections shall be welded, unless shown otherwise, and in such

a manner as to develop the full strength of the section. But welds will

be subject to approval by the Engineer, who shall have the option to

order at the Contractors expense, splice plates to be used in addition if

he fells that there is some doubt about the adequacy of the butt weld.

(c) WELDINGAll welds shall be neat and uniform in size. All welds shall be left in

their original condition after chipping for examination by the Engineer

who shall have the option to order, at the Contractors expense the

grinding down to uniform size of all rough or unsightly welds. All shop

welds shall be chipped prior to priming.

PAINTING 7.7 All structural steel except holding down bolts and the contract

surfaces ofbearing plates shall be wire-brushed and painted with one

coat of best qualityZing Chromate primer or approved equal.

Bolts, welding spots and all abrasions to shop coat shall be made good

with the same primer as above, prior to final paint.

ERECTION 7.8 (a) Erection programme shall co-ordinate with that of the main

and other contractors so as to expedite construction and prevent

delay to other work.

(b) All erection shall be carried out in accordance with standard

specification listed above.

(c) The method employed for erection shall be at the option of the

Contractor provide that this should not interfere with or damage work

by others and provide it is acceptable to the main contractor.

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(d) It is the responsibility of the Contractor to ensure stability of the

structure at all times during erection. He shall provide all temporary

bracing and remove same off the site after completion.

(e) Main frame site connection shall be with high tensile bolts using

bearing type connection, in accordance with the standard

specifications listed above. The Contractor shall provide necessary

impact wrenches, include air supply, etc. required to comply with the

specification.

(f) All other connections shall be with black bolts unless shown

otherwise.

(g) Drifting done during assembly or erection shall not distort the metalor enlarge the holes; drifting to enlarge holes will NOT be permitted.

Holes that must be enlarged to admit bolts shall be brought to the

attention of the Engineer, who may at his discretion, allow reaming.

Poor matching of holes shall be cause for rejection of the member.

(h) All members shall be installed and maintained plumb and level

and/or at the specified inclination. This shall be complied with as the

erection progresses.

(i) The requirement for welding are as per shop welding

(j) No oxy-acetylene cutting or burning shall be done without the

Engineers permission.

SHEETING 7.9 Aluminium sheeting shall comply with J.S.85 Fasteners to steelwork

shall be stainless steel self-tapping screws with Neoprene washers fused

to stainless steel washers. Side lap fasteners shall be stainless steel sheet metal

screws.

Closure strip, sills flashing, corner sheets, etc., are all to be compatible with

main sheeting.

Translucent sheeting shall be Milite or approved equal and shall be

compatible with the main sheeting. It shall be installed in accordance with

manufacturers recommendations.

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The entire installation is to be complete and in accord with good engineering

practice and strictly in compliance with B.S.C.P. 143 Part I and sheeting

manufacturers recommendations and these specifications.

Top and bottom sheets are to maintain even horizontal lines. Closure strips shall

be used at head and still of all sections and to close all openings.

The Contractor shall furnish and install with roof and siding all necessary

flashings closure strips, fasteners, tape, mastic or other type of sealing

accessories to make the installation completely shall provide everything

necessary to ensure strict compliance with this clause as no relief from its

provision is possible.

8. GENERAL METALWORK

RUST 8.1 All steel and ironwork shall have rust and scale removed by scraping and steel

wire brushing immediately before painting, and all shop prefabricated work to

be primed with one coat of approved anti-corrosive paint before fixing or

delivery to Site.

DRAWINGS 8.2 The Contractor shall supply shop drawings of all fabricated metalwork

items for the approval of the Architect.

WELDINGS 8.3 All welding shall be neatly cleaned off, and units shall be prefabricated

in the shop whenever possible. Only the minimum of site welding shall be

employed. All screwed work shall have full internal and external threads and all

holes shall have burrs cleaned off. Counter-sinkings, where required, must be

concentric.

SCREWS 8.4 All screwed work shall project at leasttwo threads through nuts and all

Bolts passings through timber shall have washers under heads or nuts bearing on

timber. Splayed washers shall be fitted where necessary to give level bearing at

sloped flanges, etc.

PRICES8.5 The rates for all metalwork shall include for all fixing unless otherwise

described at the rates for welding shall include for all labour, materials and

appliance.

DELIVERY 8.6 The Contractor shall be responsible for the prompt ordering, clearing,

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receiving storage, etc., of all items. Upon receipt from the suppliers, all items

shall be immediately checked for quantities and operation so that

replacements may be obtained if necessary without causing delay.

HARDWARE 8.7 All hardware shall be clearly marked to indicate item and location and

shall be carefully protected until completion of the Works. Finish items which

can easily be removed, such as door knobs and pulls shall be removed and

stored until painting work is completed. Other items shall be kept covered or

protected in an approved manner. Any items which do not operate properly, or

with damaged construction or finish, shall be replaced without additional charge.

Keys shall be stamped with their corresponding lock numbers by the factory or

supplier and shall be tagged for location immediately upon receipt from the

supplier. They shall hen be immediately checked for operation and handed overto the Employer.

All operating hardware shall be lubricated and adjusted as required and left in

perfect working order before handing over. Only powdered graphite or other

approved lock lubricant shall be used in locks. Operating shall be smooth, easy

and free of rattles squeaks and other unacceptable noises and defects.

Samples as required by the Architect, shall be submitted for approval and no

furniture shall be fixed with screws of the same metal and finish as the fittings

and the screw shall be provided by the supplier of the fittings.

The prices for fixing iron mongery are to include for all sinkings, notchings

morticing and other labour required to fit and fix the respective items in the best

manner and the taking off for painting and subsequent re-fitting.

Schedules of door furniture to be supplied and fixed will be furnished by the

Architect. Where items are not specifically noted by manufacturers name and

catalogue number, samples are to be submitted to the Architect for approval at

least two weeks before fixing is due to commence.

Door furniture for cupboards and fittings will be shown on detail drawings.

WINDOWS 8.8 The prices for fixing metal windows in masonry or timber framed

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openings shall include for sealing and pointing all round, external and internal

with an approved non-hardening neutral coloured tropical mastic.

9. RENDERING, PAVING AND TILING

MATERIALS 9.1 Sound shall be clean silica equal to the sample submitted to and

approved by the Architect. It shall be protected from dirt or soil during storage

and is to be free from salt, alkali, loam, clay and other deleterious matter, and

entirely suitable for plaster work.

Cement shall be as described under 2.03. It must be protected from damp, and it

must be suitably cured for plaster work.

APPLICATION 9.2 Rendering shall not be lees that 12mm finished thickness executed in twocoats and finished with a wood float.

The first rendering coat shall be cement and sand 1:4, the sand passing a No. 16

gauge sieve.

The finishing rendering coat to exterior surfaces shall be cement and sand 1:4.

the sand passing a No. 24 gauge sieve.

The finishing rendering coat to interior surfaces shall be cement and sand 1:4,

the sand passing a No. 32 gauge sieve.

Particular care shall be taken to plumb all angles and to run all junctions

between surfaces perfectly true, straight and square. Plastering mixes shall be

used up within one hour of mixing with water and all remaining after this period

shall be discarded.

PRICES9.3 The rates for rendering shall include for raking out joints of blockwalling

or roughening concrete by an approved means to form a key, for working behind

pipe and similar obstructions and for all temporary rules.

INTERNAL 9.4 All internal wall tiling shall be best quality glazed tiles. All external

WALL TILING angels and exposed edges shall be made with round edge tiles. The tiling shall

be fixed by an inorganic adhesive (Richafix or equal) used strictly in

accordance with the manufacturers instruction. Alternatively, subject to the

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Architects approval, the tiling may be set in a cement and sand (1:3) bed

properly keyed to the receiving surface.

CONCRETE 9.5 Where concrete floors and platforms are specified the surface of the slab

FLOORS while still green shall be sprinkled with a dry cement sand mix (1:3) and

AND worked up with a steel trowel or wood float to an even and regular finish

PLATFORMS and to falls as noted on the Drawings.

The construction of the slab, if necessary for the future protection of the

paving, shall wherever possible be delayed until such time as the heavy trades

are off the site.

Where the topping coat of concrete floors is required to be hardened by the

application of a hardening agent in accordance with the manufacturersinstructions, the hardener shall be Lithurin Concrete Hardener as supplied by

Mastermix Limited Kingston, unless otherwise specified or approved.

EXTERNAL 9.6 The external pebble dash rendering is to be in two coats to a minimum

PEBBLE thickness of 16mm. The initial coat shall be a scratch coat of cement and

DASH sand (1:4) the sand passing a No. 16 gauge sieve. the finishing coat shall

RENDERING consist of limestone pebbles mixed with stone dust fines to provide a

colour finish and texture to the approval of the Architect.

CONCRETE 9.7 Concrete and terrazzo floor tiles shall comply with J.S. 50.

AND Terrazzo tiles shall be of the size and grade stated in the Bills of

TERRAZZO Quantities and of approved colour and pattern, bedded in cement mortar,

FLOOR TILES ground in the colour as the of the tile and ground, neutralised, sealed and

polished unless otherwise described.

Terrazzo floor tiles must not be laid until all trades other than decorators are not

of the tiling area, and after laying, the floors shall be immediately

protected with thin polythene or by some other approved method.

Floor tiles shall be set out with the centre line of the area concerned in both

direction so that edge tiles shall be of equal width.

The rates for paving and skirting shall for all temporary rules.

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BEDS 9.8 Cement screeds shall be composed of cement/sand (1:3) laid to the

AND SCREEDS thickness required to achieve the falls shown on the Drawings. They

shall at no point be less than 12mm thick unless otherwise specifically

permitted.

Before laying screeds, the concrete surfaces shall be chipped if necessary to

form a key and then thoroughly cleaned and well sprayed with water.

A coat of cement slurry shall be applied to the surface of the slab as the work

proceeds and the screed shall then be laid before setting of the slurry. The screed

shall be kept wet for at least seven days after laying.

MAKING 9.9 Protect rendering, screeding paving and tiling and make good damage

GOOD during progress and on completion of other trades, including hacking off

and replace all hollow or loose areas and leave all perfect and to thesatisfaction of the Architect.

10. PLUMBING

REGULATIONS 10.1 The whole of the plumbing work shall be executed strictly in accordance

with the regulations and bye-laws of the Public Health Authority and/or other

competent Authority.

MATERIALS 10.2 Materials shall be of the best quality of their respective kinds in

GENERALLY accordance with the Specification and Drawing supplied by the

Architect.

The pipes are measured net as fixed, measured over all bends, tees etc., and the

rates shall include for all short running lengths sockets, connectors and back

nuts all cutting and waste, and making good around pipe supports. The rates for

fittings are to include for all extra joints.

TUBING 10.3 Galvanised mild steel tubes be seamless and shall comply in all respects

with B.S. 1387 of the qualities specified. Fitting shall be galvanised malleable

iron to B.S. 1256. Joints shall be made with BSP taper threads of fine hemp and

proprietary jointing compound.

P.V.C. tubes and fittings shall comply with J.S. 39 equal and approved.

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Joints shall be made strictly in accordance with the manufacturers printed

instructions.

SOIL 10.4 Ventillation pipes shall be cast iron galvanised steel or P.V.C. tube of the

AND sizes noted on the Drawings. They shall terminate not less than 450mm

VENTILATION above roof level and finish with a stout wire balloon well secured.

PIPES

Cast iron soil and vent pipes and fittings are to comply with B.S. 416

Medium Grade. The pipes are to be fixed with cast iron holder bats built into

the walls. The joints are to be made with a gasket of hemp or yarn or metallic

lead properly cauless with caulking tools and made perfectly airtight.

The rates shall include for all sheet lengths and extra cutting and waste and extrajoints fittings.

WASTE PIPES 10.5 Pipes connecting waste fittings to main waste, soil or drain pipes or to

trapped gully basins shall be galvanised steel or P.V.C. tubes of the size

noted on the Drawing.

All junctions for waste services shall be made with swept fittings and every

waste branch shall have adequate means of rodding.

All waste fittings are to be properly trapped with sealed traps of suitable types

and sizes.

WORKMANSHIP 10.6 The work shall be executed by fully qualified tradesmen in

accordance with the Drawings and authorized modifications thereto, to

the satisfaction of and as directed by the Architect.

All taps and valves shall be dismantled and greased before fixing.

The full bore of the pipe work shall be maintained throughout and all internal

burrs shall be reamed out.

Vertical pipe work shall be installed perpendicularly.

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Where surface mounted galvanised mild steel tube shall be required to be

fixed clear of walls with malleable iron brackets of the built in holder bat

type, maximum spacing shall be as follows:-

Diameter of Pipe Horizontal Pipe Vertical Pipe

Up to 19mm 1.80m 2.40m

20mm and over 2.40m 3.00m

N.B.: For installation procedures for P.V.C. pipe, see 8.12 hereafter

SANITARY 10.7 All sanitary fittings, fixtures, stop valves, are to be carefully installed

FITTING strictly in accordance with the manufacturers printed instructions and

the Contractor will be responsible for obtaining accurate shop drawings settingout dimensions. Fittings and fixtures are to be installed with proper tools and to

be left in perfect working order and free from all tool marks and other damage.

WATER 10.8 The supply pipes are to be set out to provide for the isolation of each

SUPPLY fitting and for emptying down of the system.

Services shall be installed to ensure positive automatic clearance of air.

CHASING 10.9 Where pipes are described as in walls, floors, etc., prices of these pipes

are to include cutting horizontal or vertical chases in hollow concrete block

walling,concrete walls floors or ceilings, large enough to accommodate the full

diameter of the pipe and socket and making good with cement mortar (1:3) flush

with adjacent surfaces. All conduit and pipework to be fixed in chases shall be

installed before the final rendering coat is applied.

All pipes whether soil, waste, ventilation or service are to be concealed in pipe

ducts or in wall chases or ceiling or under unless otherwise particularly noted on

Drawings.

Access panel shall be formed wherever necessary to give access to cleaning eyes

and stopcocks.

TESTING 10.10 The Contractor shall allow in his rates for supplying all necessary

appliances and labour for testing the whole of the work at such time and

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as directed by the Architect.

Water services shall be tested under mains pressure or as otherwise directed.

Access plugs, caps and doors shall be removed, greased, refitted and made

sound prior to the final testing.

PROTECTION 11.11 The whole of the work, materials and fittings shall be adequately

Protected against damage and deterioration, any such damage or deterioration

shall be made good and the work handed over at completion in a sound and

clean condition and in perfect working order.

INSTALLATION 11.12 Cut pipe square without ragged edges so that pipe ends seat squarely in

the fitting socket. Insert pipe to the full depth of the socket.

Ensure all joining surfaces are free of dirt, grease and any foreign matter.

The surest method is to wipe with a cloth damped with methyl ethyl ketone. For

pipe of sizes above 50mm, the use of MEK is essential.

Apply solvent cement with a natural ristle brush. Apply a light thin coat of

solvent cement first to the fitting socket. Next apply a heavy coat of solvent

cement to the pipe for a length equal to the socket depth. Immediately force the

pipe and fittings together with a slight twisting motion, if possible, to ensure full

engagement of the pipe into the fitting socket. Remove excess solvent cement

from the exterior of the joint with a clean dry cloth. Reasonable handling of the

assembly is permissible within two minutes after joining. Do not attempt to

disturb the pipe-fitting joint after the cement has set; damage to the joint and

loss of fit may result. Should any delay develop in assembly, apply an additional

coat of cement immediately prior to joining.

In assembling P.V.C. pipe and fittings, exercise care to establish proper grade

and alignment before joining with solvent cement. Installation may not be

satisfactory if pipe and fittings are subject to strain by forced positioning to

obtain grade or alignment.

Except in the case of Schedule 80 and higher gauge pipe, P.V.C. pipe should not

be threaded. Use adaptor fittings when transition from pipe to threaded

construction is necessary. A wide range of fittings to adapt traditional pipe to

P.V.C are readily available.

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Normal construction site handling procedures can be followed. It is good to

practice to store pipe and fittings under suitable cover prior to installation.

Make connections or transitions to bell-and spigot or other pipe and fittings withapproved mechanical compression joints or caulked joints made in an approved

manner. In caulking, pack the joint with oakum or hemp and fill with molten

lead to a depth of not less than 25mm. Allow a period of 4 minutes for cooling,

following which caulk the lead at the inside and outside edges of the joint.

The Specifications referred to herein with regard to plumbing pipe work and

installation will apply equally to the pipe work and installation relating to the

Air-Conditioning Services.

12. GLAZING

GLASS 12.1 The whole of the glass shall be the best of its respective kind,

free from all speaks. waves, bubbles, scratches and other defects, and shall be of

the respective weights or thickness and types indicated on the Glass Distribution

Schedule below and on the Drawings.

All broken or cracked panes shall be replaced at completion of the Works and

the whole of the glazing left clean and perfect. Provide all necessary wash

leather or velvet glazing strips.

GLASS 12.2 All exterior and interior panes, except specifically noted otherwise on the

Drawings shall have maximum allowable size per pane as follows:-

3mm float2000 united millimetres



7/32(5.5mm) float 4.50 square metres

PUTTY 12.3 Putty for use in glazing to woodwork shall be composed of best

linseed oil and whiting and comply with B.S.

13. PAINTING

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MATERIALS 13.4 All painting materials, varnishes and colours shall be approved by the

Architect and shall be equal to the products of Berger Paints Jamaica Limited,

256 Spanish Town Road, Kingston 11, Jamaica or Sherwin Williams (W.I.) P.O.

Box 35, Kingston 11, Whitemarl, Spanish Town, Jamaica. All paints andpainting materials are to be strictly in accordance with the latest standard

manufacturers specifications.

SAMPLE 13.5 0.60 x 0.60mm Sample boards showing the colours and tints of the

PANELS various paints to be used shall be submitted to and approved by the

Architect prior to painting.

PREPARATION 13.6 All surfaces are to be prepared with the correct knotting, primers, sealers

And stopping as required by the manufacturers instructions for each

type of paint and surface, and shall be applied accordingly.

All paints and varnishes shall be thoroughly mixed or stirred before use.

They shall be so stored and sealed to minimise exposure to drying and exposure

to dry and extremes of temperature.

All defective plaster and/or rendering shall be cut out and made good in

approved fashion before painting. Slight cracks shall be made good with hard

stopping.

All paint or varnish on woodwork shall be rubbed down with fine glass paper

between each coat. Each coat shall be hard, dry and free from moisture or

condensation before the next coat is applied.

All woodwork specified as painted is to be primed before being fixed in

position.

All knots are to receive two coats of knotting applied thinly and well brushed in.

Loose knots shall be removed and the holes plugged with sound wood.

Large knots shall be cut back and made good with hard stopping.

In no case shall any paint or distemper be applied to concrete or rendered

surfaces until such surfaces are completely dried out and clear of efflorescent

tendencies.

No paint or distemper are not to be applied prematurely but only after all dirty

trades haves left the work.

Last coats of paint or distemper are not to be applied until immediately before

handing over the building.

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The proctection of the finished work and touching up shall be the Contactor,s

responsibility.

The term Prepare in these Bills of Quantities has meaning as follows:-

(i) If it refers to paint or varnish on wood it includes knotting, stopping

and filling.

(ii) If it refers to paint on metal it includes cleaning with wire brushes.

WORKMEN 13.7 Only skilled workmen are to be employed. A properly qualified painting

foremen is to be constantly on the job while the work is in

progress.

FITTINGS 13.8 All removable metal fittings are to be removed before the preparatoryprocesses are commenced and are to be re-fixed on completion.

IRON AND 13.9 All iron and steel work before painting is to be scraped and cleaned with

STEEL WORK wire brushes until all grease, scale, rust and loose substances are

removed. Each coat is to be carefully and evenly applied until the

previous coat is hard, dry and free from moisture.

PARTI- 12.10 The Contractor is to allow in his rates for executing the whole of the

COLOURS foregoing work in parti-colours as many be directed by the Architect. the