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FINAL DRAFT UGANDA

STANDARD

FDUS 895-2

First Edition 2011-mm-dd

Reference number FDUS 895-2: 2011

© UNBS 2011

Specification for expanded metal — Part 2: Building products

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ii © UNBS 2011 – All rights reserved

Compliance with this standard does not, of itself confer immunity from legal obligations

A Uganda Standard does not purport to include all necessary provisions of a contract. Users are responsible for its correct application

© UNBS 2011

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written permission from UNBS.

Requests for permission to reproduce this document should be addressed to

The Executive Director Uganda National Bureau of Standards P.O. Box 6329 Kampala Uganda Tel: 256 414 505 995 Fax: 256 414 286 123 E-mail: [email protected] Web: www.unbs.go.ug

mailto:[email protected]

FDUS 895-2:2011

© UNBS 2011 – All rights reserved iii

Foreword

Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Tourism, Trade and Industry established under Cap 327, of the Laws of Uganda. UNBS is mandated to co-ordinate the elaboration of standards and is

(a) a member of International Organisation for Standardisation (ISO) and

(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and

(c) the National Enquiry Point on TBT/SPS Agreements of the World Trade Organisation (WTO).

The work of preparing Uganda Standards is carried out through Technical Committees. A Technical Committee is established to deliberate on standards in a given field or area and consists of representatives of consumers, traders, academicians, manufacturers, government and other stakeholders.

Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the general public for comments. The committee reviews the comments before recommending the draft standards for approval and declaration as Uganda Standards by the National Standards Council.

Committee membership

The following organizations were represented on the Technical Committee for Building and civil engineering standards (UNBS/TC 3) during the development of this standard:

Makerere University

Department of Geological Mines& Surveys

Uganda Baati Ltd

Roofings Ltd

Kyambogo University

Uganda National Bureau of Standards

FINAL DRAFT UGANDA STANDARD FDUS 895-2: 2011

© UNBS 2011 – All rights reserved 1

Specification for expanded metal — Part 2: Building products

1 Scope

This part of the specification covers eight types of building product made from expanded metal and intended for use as a plaster base or as a reinforcing medium for brickwork.

NOTE 1 The requirements that should be specified by the purchaser and are listed in Annex A.

NOTE 2 Guidance on the verification of the quality of expanded metal building products produced to this part of the specification is given in Annex B.

NOTE 3 Notes on typical uses of expanded metal building products are given in Annex C.

2 Terms and definitions

For the purposes of this part standard the terms and definitions given in Part 1 of the specification and the following apply:

2.1 building product product in sheet or roll form that has been made from expanded metal and that is intended for use in certain specified building applications

2.2 Roll building product supplied in roll form

2.3 Size (of angle bead or corner mesh) combination of the width of each expanded wing or leg and the length of the product

2.4 Size (of plaster stop) combination of the width of the expanded wing and the length of the product

3 Requirements

3.1 Material

A building product shall be of mild steel or a pre-galvanized mild steel such that, when the product is tested in accordance with 5.3, the metal strands show no signs of cracking or fracture.

3.2 Type

A building product shall be of one of the types listed in Column 1 of Table 1.

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2 © UNBS 2011 – All rights reserved

3.3 Dimensions

The size of a building product shall be one of the combinations listed in column 2 of Table 1, appropriate to the product type, and the strand thickness shall be one of the values given in column 3 of Table 1, appropriate to the size of the product. No actual dimension of a product shall differ from the nominal value given in column 2 or 3 of Table 1 by more than the appropriate tolerance.

3.4 Squareness

Any out-of-squareness of a building product in sheet form shall be such that the difference between the lengths of the diagonals does not exceed 2 mm per 100 mm of the sheet length (SW).

3.5 Straightness, twist and warp

3.5.1 Angle bead and corner mesh

Any deviation from straightness of angle bead and corner mesh shall not exceed 6 mm per metre of the length and there shall be no twist in the length of the product.

3.5.2 Rib lath and strip mesh

When determined in accordance with 5.2 any warp (see Figure 2) in rib lath or strip mesh shall not exceed 6 mm per metre of the length.

3.5.3 Plaster stop

Any deviation from straightness of a plaster stop shall not exceed 6 mm per metre of the length and any twist shall not exceed 10º per metre of the length.

3.6 Workmanship

Sheets and rolls of building products shall be regular in shape, and the dimensions of the meshes and strands shall be uniform.

3.7 Freedom from defects

Except for sharp points caused by open meshes at the edges, sheets and rolls of building products shall be free from broken strands and from burrs, ragged edges, cracks, welds and other surface defects.

3.8 Protective coating

Building products not made from pre-galvanized mild steel shall have a protective coating of black bitumen paint.

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4 Packaging and marking

4.1 Packing

Unless otherwise agreed between the purchaser and the supplier, expanded metal sheets and plates shall be supplied loose or securely tied together in bundles, or packed in suitable containers. Only products of the same type and size shall be packed together in the same bundle or container.

4.2 Marking

The following information legibly and durably marked on a tag or label that is securely attached to the loose product, bundle or container, as relevant:

a) the manufacturer's name or trade name or trade mark;

b) the product type;

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c) when relevant, the quantity of building products in each bundle or container.

5 Inspection and methods of test

5.1 Inspection

Visually examine and measure each building product in the sample for compliance with all the requirements of clauses 3 and 4 for which tests to assess compliance are not given in 5.2 and 5.3 (see also Annex D regarding the accuracy of building products.

5.2 Determination of warp. (rib lathe and strip mesh)

Determine, as follows, the warp of each building product in the sample as follows (see also Figure 2):

Lay the building product (concave face downwards) on a plane surface, ensure that the corners at the ends of the side or end on which the warp is to be measured are in contact with the plane surface, and measure the maximum deviation between the surface and the side or end ( as relevant ) . Repeat the test on the remaining side or end, and determine the maximum warp in each case. Check for compliance with the requirement of 3.5.2

5.3 Formability test

5.3.1 Preparation of test specimens

From a sample building product, cut a test specimen of dimensions either,

a) in the case of products having a width equal to or exceeding 150 mm: 150 mm x 150 mm; or

b) in the case of products having a width of less than 150 mm: 150 mm in length, and of width equal to the maximum width of the flat expanded metal part of the product.

5.3.2 Procedure

Using a mandrel of radius 6 mm, bend the specimen through approximately 90º in either direction along the longer axis of symmetry of the specimen or, in the case of a square specimen, along either axis of symmetry. Examine the metal in the bend for compliance with the requirements of 3.1.

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Annex A (normative)

Notice to purchasers

The following requirements shall be specified in tender invitations and in each order or contract:

a) the type of building product (see 3.2); and

b) when relevant, the size of building product (see 3.3).

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Annex B (normative)

Quality evaluation of expanded metal building products produced to the

requirements laid down in this part of the specification

When a purchaser requires quality verification on an ongoing basis of expanded metal building products produced to this part of the specification, it is suggested that, rather than to evaluate the final product only, he also directs his attention to the quality management system applied by the manufacturer. In this connection it should be noted that this standard covers the provision of an integrated quality management system.

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Annex C (normative)

Typical uses of expanded metal building products

D.1 General

Building products are secured to a wall as a keying foundation for plaster surfaces or as a means of reinforcing brickwork [see D.2(c)]. Owing to the thin section of the material from which these products are manufactured, the product will tend to follow the form of the brickwork. Consequently, while it is necessary to lay down limits on the departure from straightness, or on the degree of twist or warp of a building product in the interests of quality control during and after manufacture, a building product that complies with these requirements could, after being secured to a wall, be so distorted as to no longer lie within the specified limits.

D.2 Typical uses

D.2.1 Angle bead

Expanded wing angle bead is used to provide a true straight edge for forming an arris on external corners in plasterwork, and to resist damage at this vulnerable point of the plaster rendering. The expanded wings of the angle bead anchor securely in the full depth of the plaster on both sides of the arris .

D.2.2 Base bead

Expanded wing base bead is used to provide a straight dividing strip between sections of plaster, different types of plaster, and between plaster and other non-compatible materials. When spaced at regular intervals base bead can be used as a depth guide for rendering a flat and level plaster surface to receive tiling, e t c.

D.2.3 Brick reinforcing

Brick reinforcing is used by embedding it in the horizontal mortar joints of brick and block work as a reinforcement to reduce the detrimental effects of vibration, changes of temperature and tensional stresses caused by ground settlement beneath the brick or block work.

D.2.4 Corner mesh

Corner mesh is used as reinforcement for internal corners in plasterwork to reduce the possibility of cracking of the plaster because of shrinkage.

D.2.5 Plaster lath

Plaster lath is used as a keying and an anti - cracking base for general plasterwork and is also used as a background for sprayed finishes on wall and suspended ceiling applications.

D.2.6 Plaster stop

Expanded wing plaster stop is used to provide a straight edge and finish for plasterwork at all openings and abutments. It can also be used where plaster butts against tiles, face bricks, skirtings, exposed steelwork and woodwork.

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D.2.7 Rib lath

Having stiffening ribs, rib lath is capable of larger spans than are possible with plain metal lath when used as a background for suspended ceilings and partitions. Rib lath is also used for external render and stucco work.

D.2.8 Strip mesh

Strip mesh is a general purpose reinforcing for plaster and is used along stress lines where cracking is likely to occur. Typical applications are at the corners of door frames and window frames, around air bricks, vents and arches. It is also used as a backing for plaster over narrow gaps such as service chases for water pipes and electrical conduits.

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Bibliography

US 895-1, Expanded metal Part I: Sheets and plates

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Certification marking

Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards (UNBS) Certification Mark shown in the figure below.

The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made thereunder. This mark can be used only by those licensed under the certification mark scheme operated by the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The presence of this mark on a product or in relation to a product is an assurance that the goods comply with the requirements of that standard under a system of supervision, control and testing in accordance with the certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are continually checked by UNBS for conformity to that standard.

Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda National Bureau of Standards.

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