end of addendum #2

PURCHASING DEPARTMENT

The bid listed below has had addenda issued. Documents are available over the Internet at http://www.norwalkct.org Adobe Acrobat reader is required to view this document. If you do not have this software you may down load it for free from Adobe. The document number to request will be the same as the project number indicated below

Project # Addendum # # of pages Original Issue Date

3530 2 23 March 31, 2015

Date

April 17, 2015

Project Number

3530 .

Addenda Number

2

Deadline

2:00 PM

April 23, 2015 Project Title

Dome Roof & Window Replacement – Norwalk City Hall

This Addendum is a contract document modifying previously issued documents, which remain in full force except as specifically modified below. Quotations appearing on the Proposal are to reflect the provisions of this Addendum. Failure to acknowledge receipt of this Addendum in the space provided on the response sheet may subject candidate to disqualification. New Specifications: Section 073116, WEATHER BARRIERS has been added and is attached as part of this addendum. Changes to the Specifications: • DELETE Section 061600, SHEATHING in its entirety. • ADD revised Section 061600, SHEATHING, attached as part of this addendum (Changes in bold). • DELETE Section 071326, SELF-ADHERING SHEET WATERPROOFING in its entirety. • ADD Section 071326, SELF-ADHERING SHEET WATERPROOFING, attached as part of this addendum (Changes in bold). • DELETE Section 073116, METAL SHINGLES in its entirety. • ADD Section 073116, METAL SHINGLES, attached as part of this addendum (Changes in bold). Changes to the Drawings: • DELETE Drawing A1 “Dome Plans and Details”. • ADD Drawing A1 “Dome Plans and Details - Revision 1”, dated April 16, 2015, attached as part of this addendum.

End of Addendum #2

ADDENDUM #2

City Hall Dome Roof Replacement – Norwalk Addendum #2-1

CITY OF NORWALK CITY HALL DOME ROOF REPLACEMENT 125 EAST AVENUE NORWALK, CT CITY OF NORWALK PROJECT NO. 3530 S/P+A PROJECT NO. 13.244 DATE: April 16, 2015 The following changes to the Drawings and Project Specifications shall become a part of the Drawings and Project Specifications; superseding previously issued Drawings and Project Specifications to the extent modified by Addendum No. 2. New Specifications: • Section 073116, WEATHER BARRIERS has been added and is attached as part of this addendum. Changes to the Specifications:

• DELETE Section 061600, SHEATHING in its entirety. • ADD revised Section 061600, SHEATHING, attached as part of this addendum (Changes in bold). • DELETE Section 071326, SELF-ADHERING SHEET WATERPROOFING in its entirety. • ADD Section 071326, SELF-ADHERING SHEET WATERPROOFING, attached as part of this

addendum (Changes in bold). • DELETE Section 073116, METAL SHINGLES in its entirety. • ADD Section 073116, METAL SHINGLES, attached as part of this addendum (Changes in bold). Changes to the Drawings:

• DELETE Drawing A1 “Dome Plans and Details”. • ADD Drawing A1 “Dome Plans and Details - Revision 1”, dated April 16, 2015, attached as

part of this addendum.

The bid due dates are unchanged by this addendum. The addendum consists of one (1) page of 8½” x 11” text, and one (1) page of 24” x 36” drawing. End of Addendum #2

SHEATHING

Replacement/Repair of City Hall Dome Roof – Norwalk 061600-1

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes: 1. Roof sheathing.

B. Related Requirements:

1. Section 071326 "Self Adhered Sheet Waterproofing Membrane" for application of waterproofing membrane over roof sheathing.

2. Section 073116 “Metal Shingles” for installation of copper shingles.

1.3 ACTION SUBMITTALS

A. Product Data: For each type of process and factory-fabricated product. Indicate component materials and dimensions and include construction and application details.

1. Include data for wood-preservative treatment from chemical treatment manufacturer and certification by treating plant that treated plywood complies with requirements. Indicate type of preservative used and net amount of preservative retained.

2. For products receiving waterborne treatment, include statement that moisture content of treated materials was reduced to levels specified before shipment to Project site.

1.4 INFORMATIONAL SUBMITTALS

A. Evaluation Reports: For the following, from ICC-ES:

1. Wood-preservative-treated plywood.

SHEATHING


1.5 QUALITY ASSURANCE

A. Testing Agency Qualifications: For testing agency providing classification marking for fire-retardant-treated material, an inspection agency acceptable to authorities having jurisdiction that periodically performs inspections to verify that the material bearing the classification marking is representative of the material tested.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Stack panels flat with spacers beneath and between each bundle to provide air circulation. Protect sheathing from weather by covering with waterproof sheeting, securely anchored. Provide for air circulation around stacks and under coverings.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Fire-Resistance Ratings: As tested according to ASTM E 119; testing by a qualified testing agency. Identify products with appropriate markings of applicable testing agency.

1. Fire-Resistance Ratings: Indicated by design designations from UL's "Fire Resistance Directory" or from the listings of another qualified testing agency.

2.2 WOOD PANEL PRODUCTS

A. Emissions: Products shall meet the testing and product requirements of the California Department of Public Health's "Standard Method for the Testing and Evaluation of Volatile Organic Chemical Emissions from Indoor Sources Using Environmental Chambers."

B. Thickness: As needed to comply with requirements specified, but not less than thickness indicated.

C. Factory mark panels to indicate compliance with applicable standard.

2.3 PRESERVATIVE-TREATED PLYWOOD

A. Preservative Treatment by Pressure Process: AWPA U1; Use Category UC2.

1. Preservative Chemicals: Acceptable to authorities having jurisdiction and containing no arsenic or chromium.

SHEATHING


B. Mark plywood with appropriate classification marking of an inspection agency acceptable to authorities having jurisdiction.

C. Application: Treat all plywood unless otherwise indicated and plywood in contact with masonry or concrete or used with roofing, flashing, vapor barriers, and waterproofing.

2.4 ROOF SHEATHING

A. Plywood Sheathing: Either DOC PS 1 or DOC PS 2, Exterior, Structural I sheathing.

1. Span Rating: Not less than 16/0. 2. Nominal Thickness: Not less than (2) layers of 1/4 inch.

2.5 FASTENERS

A. General: Provide fasteners of size and type indicated that comply with requirements specified in this article for material and manufacture.

1. For roof sheathing, provide fasteners with hot-dip zinc coating complying with ASTM A 153/A 153M.

B. Nails, Brads, and Staples: ASTM F 1667.

C. Power-Driven Fasteners: Fastener systems with an evaluation report acceptable to authorities having jurisdiction, based on ICC-ES AC70.

D. Screws for Fastening Sheathing to Wood Framing: ASTM C 1002.

PART 3 - EXECUTION

3.1 INSTALLATION, GENERAL

A. Do not use materials with defects that impair quality of sheathing or pieces that are too small to use with minimum number of joints or optimum joint arrangement. Arrange joints so that pieces do not span between fewer than three support members.

B. Cut panels at penetrations, edges, and other obstructions of work; fit tightly against abutting construction unless otherwise indicated.

C. Securely attach to substrate by fastening as indicated, complying with the following:

1. Table 2304.9.1, "Fastening Schedule," in the ICC's International Building Code. 2. ICC-ES evaluation report for fastener.

SHEATHING


D. Use Series 300 stainless steel wood screws unless otherwise indicated. Select fasteners of size that will not fully penetrate members where opposite side will be exposed to view or will receive finish materials. Make tight connections. Install fasteners without splitting wood.

E. Coordinate roof sheathing installation with flashing and joint-sealant installation so these materials are installed in sequence and manner that prevent exterior moisture from passing through completed assembly.

F. Do not bridge building expansion joints; cut and space edges of panels to match spacing of structural support elements.

G. Coordinate sheathing installation with installation of materials installed over sheathing so sheathing is not exposed to precipitation or left exposed at end of the workday when rain is forecast.

3.2 WOOD STRUCTURAL PANEL INSTALLATION

A. General: Comply with applicable recommendations in APA Form No. E30, "Engineered Wood Construction Guide," for types of structural-use panels and applications indicated.

B. Fastening Methods: Fasten panels as indicated below:

1. Roof Sheathing:

a. Screw to existing plywood sheathing and wood framing, minimum 1-1/2 inches embedment into wood framing, with Series 300 stainless steel wood screws. Apply a continuous bead of adhesive at edges of roof sheathing panels.

b. Stagger joints between new and existing sheathing layer and between new sheathing layers.

c. Space panels 1/8 inch (3 mm) apart at edges and ends.

END OF SECTION 061600

SELF-ADHERING SHEET WATERPROOFIONG


PART 1 - GENERAL



1.2 SUMMARY

A. Section Includes:

1. Modified bituminous sheet waterproofing.


1. Section 061600 "Sheathing" for plywood roof sheathing that interfaces with waterproofing.

1.3 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site.

1. Review waterproofing requirements including surface preparation, substrate condition and pretreatment, minimum curing period, forecasted weather conditions, special details and sheet flashings, installation procedures, testing and inspection procedures, and protection and repairs.


A. Product Data: For each type of product.

1. Include construction details, material descriptions, and tested physical and performance properties of waterproofing.

2. Include manufacturer's written instructions for evaluating, preparing, and treating substrate.

B. Shop Drawings: Show locations and extent of waterproofing and details of substrate joints and cracks, sheet flashings, penetrations, inside and outside corners, tie-ins with adjoining waterproofing, and other termination conditions.

C. Samples: For each exposed product and for each color and texture specified, including the following products:



1. 8-by-8-inch (200-by-200-mm) square of waterproofing and flashing sheet. 2. 8-by-8-inch (200-by-200-mm) square of insulation. 3. 4-by-4-inch (100-by-100-mm) square of drainage panel. 4. Plaza-deck paver, 4-by-4-inch (100-by-100-mm) square, in each color and texture

required. 5. Paver pedestal assembly.


A. Qualification Data: For Installer.

B. Field quality-control reports.

C. Sample Warranties: For special warranties.


A. Installer Qualifications: An entity that employs installers and supervisors who are trained and approved by waterproofing manufacturer.

B. Mockups: Build mockups to verify selections made under Sample submittals and to set quality standards for installation.

1. Build for each typical waterproofing installation including accessories to demonstrate surface preparation, crack and joint treatment, corner treatment, and protection.

a. Size: 100 sq. ft. (9.3 sq. m) in area. b. Description: Each type of deck installation.

2. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Architect specifically approves such deviations in writing.

3. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

1.7 FIELD CONDITIONS

A. Environmental Limitations: Apply waterproofing within the range of ambient and substrate temperatures recommended by waterproofing manufacturer. Do not apply waterproofing to a damp or wet substrate.

1. Do not apply waterproofing in snow, rain, fog, or mist.



B. Maintain adequate ventilation during preparation and application of waterproofing materials.

1.8 WARRANTY

A. Manufacturer's Warranty: Manufacturer's standard materials-only warranty in which manufacturer agrees to furnish replacement waterproofing material for waterproofing that does not comply with requirements or that fails to remain watertight within specified warranty period.

1. Warranty Period: Five years from date of Substantial Completion.

B. Installer's Special Warranty: Specified form, signed by Installer, covering Work of this Section, for warranty period of two years.

1. Warranty includes removing and reinstalling protection board, drainage panels, insulation, and pedestals.

PART 2 - PRODUCTS

2.1 MATERIALS, GENERAL

A. Source Limitations for Waterproofing System: Obtain waterproofing materials from single source from single manufacturer.

2.2 MODIFIED BITUMINOUS SHEET WATERPROOFING

A. Modified Bituminous Sheet: Minimum 60-mil (1.5-mm) nominal thickness, self-adhering sheet consisting of 56 mils (1.4 mm) of rubberized asphalt laminated on one side to a 4-mil- (0.10-mm-) thick, polyethylene-film reinforcement, and with release liner on adhesive side.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following: a. Grace Construction Products; W.R. Grace & Co.; Ice and Water

Shield HT (High Temperature) – BASIS OF DESIGN.

b. Carlisle Coatings & Waterproofing Inc. c. W.R. Meadows, Inc.

2. Physical Properties:

a. Tensile Strength, Membrane: 250 psi (1.7 MPa) minimum; ASTM D 412, Die C, modified.

http://www.specagent.com/Lookup?ulid=1608

http://www.specagent.com/Lookup?uid=123456967759






b. Ultimate Elongation: 300 percent minimum; ASTM D 412, Die C, modified.

c. Low-Temperature Flexibility: Pass at minus 20 deg F (minus 29 deg C); ASTM D 1970.

d. High-Temperature Resistance: Up to 260 degrees Farenheit. e. Crack Cycling: Unaffected after 100 cycles of 1/8-inch (3-mm) movement;

ASTM C 836. f. Puncture Resistance: 40 lbf (180 N) minimum; ASTM E 154. g. Water Absorption: 0.2 percent weight-gain maximum after 48-hour

immersion at 70 deg F (21 deg C); ASTM D 570. h. Water Vapor Permeance: 0.05 perms (2.9 ng/Pa x s x sq. m) maximum;

ASTM E 96/E 96M, Water Method. i. Hydrostatic-Head Resistance: 200 feet (60 m) minimum; ASTM D 5385.

3. Sheet Strips: Self-adhering, rubberized-asphalt strips of same material and thickness as sheet waterproofing.

2.3 AUXILIARY MATERIALS

A. General: Furnish auxiliary materials recommended by waterproofing manufacturer for intended use and compatible with sheet waterproofing.

1. Furnish liquid-type auxiliary materials that comply with VOC limits of authorities having jurisdiction.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements and other conditions affecting performance of the waterproofing. 1. Verify that substrate is visibly dry and within the moisture limits recommended in

writing by manufacturer. Test for capillary moisture by plastic sheet method according to ASTM D 4263.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 SURFACE PREPARATION

A. Clean, prepare, and treat substrates according to manufacturer's written instructions. Provide clean, dust-free, and dry substrates for waterproofing application.

B. Mask off adjoining surfaces not receiving waterproofing to prevent spillage and overspray affecting other construction.



C. Remove grease, oil, bitumen, form-release agents, paints, curing compounds, and other penetrating contaminants or film-forming coatings from concrete.

D. Prepare, fill, prime, and treat joints and cracks in substrates. Remove dust and dirt from joints and cracks according to ASTM D 4258.

1. Install sheet strips of width according to manufacturer's written instructions and center over treated construction and contraction joints and cracks exceeding a width of 1/16 inch (1.6 mm).

E. Bridge and cover roof deck joints with overlapping sheet strips of widths according to manufacturer's written instructions.

1. Invert and loosely lay first sheet strip over center of joint. Firmly adhere second sheet strip to first and overlap to substrate.

F. Corners: Prepare, prime, and treat inside and outside corners according to ASTM D 6135.

G. Prepare, treat, and seal vertical and horizontal surfaces at terminations and penetrations through waterproofing and at drains and protrusions according to ASTM D 6135.

3.3 MODIFIED BITUMINOUS SHEET-WATERPROOFING APPLICATION

A. Install modified bituminous sheets according to waterproofing manufacturer's written instructions and recommendations in ASTM D 6135.

B. Apply and firmly adhere sheets over area to receive waterproofing. Accurately align sheets and maintain uniform 2-1/2-inch- (64-mm-) minimum lap widths and end laps. Overlap and seal seams, and stagger end laps to ensure watertight installation.

1. When ambient and substrate temperatures range between 25 and 40 deg F (minus 4 and plus 5 deg C), install self-adhering, modified bituminous sheets produced for low-temperature application. Do not use low-temperature sheets if ambient or substrate temperature is higher than 60 deg F (16 deg C).

C. Horizontal Application: Apply sheets from low to high points of decks to ensure that laps shed water.

D. Apply continuous sheets over already-installed sheet strips, bridging substrate cracks, construction, and contraction joints.

E. Seal edges of sheet-waterproofing terminations with mastic.

F. Install sheet-waterproofing and auxiliary materials to tie into adjacent waterproofing.



G. Repair tears, voids, and lapped seams in waterproofing not complying with requirements. Slit and flatten fishmouths and blisters. Patch with sheet waterproofing extending 6 inches (150 mm) beyond repaired areas in all directions.

3.4 FIELD QUALITY CONTROL

A. Engage a site representative qualified by waterproofing membrane manufacturer to inspect substrate conditions, surface preparation, membrane application, flashings, protection, and drainage components, and to furnish daily reports to Architect.

B. Flood Testing: Flood test each deck area for leaks, according to recommendations in ASTM D 5957, after completing waterproofing but before overlying construction is placed. Install temporary containment assemblies, plug or dam drains, and flood with potable water.

1. Flood to an average depth of 2-1/2 inches (64 mm) with a minimum depth of 1 inch (25 mm) and not exceeding a depth of 4 inches (100 mm). Maintain 2 inches (51 mm) of clearance from top of sheet flashings.

2. Flood each area for 24 hours. 3. After flood testing, repair leaks, repeat flood tests, and make further repairs until

waterproofing installation is watertight.

C. Engage an independent testing agency to observe flood testing and examine underside of decks and terminations for evidence of leaks during flood testing.

D. Prepare test and inspection reports.

3.5 PROTECTION, REPAIR, AND CLEANING

A. Do not permit foot or vehicular traffic on unprotected membrane.

B. Protect waterproofing from damage and wear during remainder of construction period.

C. Correct deficiencies in or remove waterproofing that does not comply with requirements; repair substrates, reapply waterproofing, and repair sheet flashings.

D. Clean spillage and soiling from adjacent construction using cleaning agents and procedures recommended by manufacturer of affected construction.


WEATHER BARRIERS


PART 1 - GENERAL



1.2 SUMMARY

A. Section Includes:

1. Building paper.



B. Shop Drawings: Show details of building paper at terminations, openings, and penetrations. Show details of flexible flashing applications.


A. Evaluation Reports: For water-resistive barrier, from ICC-ES.

PART 2 - PRODUCTS

2.1 WATER-RESISTIVE BARRIER

A. Building Paper: ASTM D 226, Type 1 (No. 15 asphalt-saturated organic felt), unperforated.

B. Building Paper: Red Rosin, 11.5 mils thick.

PART 3 - EXECUTION

3.1 WATER-RESISTIVE BARRIER INSTALLATION

A. Cover exposed exterior surface of sheathing with water-resistive barrier securely fastened to framing immediately after sheathing is installed.

B. Cover sheathing with water-resistive barrier as follows:

WEATHER BARRIERS


1. Cut back barrier 1/2 inch (13 mm) on each side of the break in supporting members at expansion- or control-joint locations.

2. Apply barrier to cover vertical flashing with a minimum 4-inch (100-mm) overlap unless otherwise indicated.

C. Building Paper (No. 15 asphalt-saturated organic felt): Apply horizontally with a 2-inch (50-mm) overlap and a 6-inch (150-mm) end lap over high temperature self-adhering sheet waterproofing as indicated on Drawings; fasten to sheathing with brass or stainless steel staples, or brass or stainless steel roofing nails.

D. Building Paper (Red Rosin): Apply horizontally with a 2-inch (50-mm) overlap and a 6-inch (150-mm) end lap over No. 15 asphalt-saturated organic felt as indicated on Drawings; fasten to sheathing with brass or stainless steel staples, or brass or stainless steel roofing nails.


METAL SHINGLES


PART 1 - GENERAL



1.2 SUMMARY

A. Section Includes: 1. Individual metal shingles. 2. Accessory metal flashing and trim.


1. Section 061600 "Sheathing" for sheathing.

2. Section 072500 “Weather Barriers” for building paper and rosin paper for thermal protection of self-adhering sheet waterproofing.

3. Section 073126 “Self-Adhering Sheet Waterproofing Membrane” for underlayment requirements.

1.3 DEFINITIONS

A. Roofing Terminology: See ASTM D 1079 and glossary in NRCA's "The NRCA Roofing Manual: Steep-Slope Roof Systems" for definitions of terms related to roofing work in this Section.

1.4 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site.



1. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes for each manufactured product and accessory.

METAL SHINGLES


B. Shop Drawings: For metal shingles. Include roof plans; sections at hips, gables, ridges, valleys, and eaves; details of metal shingles, flashing, trim, and accessories; and attachments to other work.

C. Samples for Initial Selection: For each type of metal shingle and accessory indicated with factory-applied color finishes.

D. Samples for Verification: Full-size components of each type of metal shingle and exposed finish indicated, including visible accessories.


A. Coordination Drawings: Roof plans, drawn to scale, on which the following items are shown and coordinated with each other, using input from installers of the items involved:

1. Metal shingles, joint pattern, and attachments. 2. Details for penetrations.

B. Product Test Reports: For metal shingles, for tests performed by a qualified testing agency.

C. Sample Warranty: For manufacturer's special warranties.

1.7 MAINTENANCE MATERIAL SUBMITTALS

A. Furnish extra materials, from the same production run, that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Metal Shingles: 30 sq. ft. (3 sq. m) of exposed area, in each type and color, in unbroken bundles.


A. Mockups: Build mockups to verify selections made under Sample submittals and to demonstrate aesthetic effects.

1. Build mockups of metal shingles, including related roofing materials.

a. Size: 48 inches (1200 mm) long by 96 inches (2400 mm) wide. b. Include metal drip edge complying with requirements in Section 076200

"Sheet Metal Flashing and Trim."

METAL SHINGLES


2. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Architect specifically approves such deviations in writing.

3. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

1.9 DELIVERY, STORAGE, AND HANDLING

A. Do not store metal-shingle materials in contact with other materials that might cause staining, denting, or other surface damage. Store metal-shingle materials away from uncured concrete and masonry.

B. Retain strippable protective covering on metal shingles during installation.

1.10 FIELD CONDITIONS

A. Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit roofing to be performed according to manufacturer's written instructions and warranty requirements.

1.11 WARRANTY

A. Special Warranty: Manufacturer agrees to repair or replace metal shingles and accessories that fail in workmanship and/or materials within specified warranty period.

1. Failures include, but are not limited to, the following: a. Deterioration of metals, metal finishes, and other materials beyond

normal weathering.

2. Special Warranty Period: Minimum 20 years from date of Substantial Completion, non-prorated and no dollar limit.

3. Special warranty includes metal roofing shingle material.

B. Contractor Warranty: Contractor agrees to repair or replace metal shingles and accessories that fail in fabrication and/or installation within specified warranty period.

1. Failures include, but are not limited to, the following:

a. Structural failures. b. Water penetration and hail perforation.

METAL SHINGLES


2. Contractor Warranty Period: 2 years from date of Substantial Completion, non-prorated and no dollar limit.

3. Contractor Warranty includes roofing, base flashings, roof insulation, fasteners, cover boards, substrate board, roofing accessories, and all other components of roofing system.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. General Performance: Metal shingles shall withstand exposure to weather and resist thermally induced movement without failure, rattling, leaking, or fastener disengagement due to defective manufacture, fabrication, installation, or other defects in construction.

B. Fire-Test Exposure Rating: Class A as acceptable to authorities having jurisdiction.

C. Impact Resistance: Class 3 when tested according to UL 2218.

D. Solar Reflectance Index: Not less than 29 when calculated according to ASTM E 1980, based on testing identical products by a qualified testing agency.

E. Energy Performance, ENERGY STAR: Provide roofing system that is listed on the DOE's "ENERGY STAR Roof Product List" for steep-slope roof products.

2.2 METAL SHINGLES

A. Copper Shingles: Field-formed, interlocking individual shingles.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following: a. Revere Copper Products, Inc., Rome, N.Y.; (800).448.1776, (BASIS OF

DESIGN). b. Architectural Products by Outwater LLC, Woodridge, N.J. (800.631.8375). c. Cheney Flashing Company; Trenton, N.J. (800.322.2873). d. Substitutions: Under provisions of Section 016000.

2. Source Limitations: Obtain copper shingles from single source from single

manufacturer.

3. Individual Shingles: Rectangular shingle units, including cleats.

a. Material at Flat Locked and Soldered Areas: Copper sheet, 20 oz./sq. ft. (0.027 inch thick).

METAL SHINGLES


b. Material at Loose Locked Areas: Copper sheet, 16 oz./sq. ft. (0.55 mm-thick).

c. Exposure: Varies – see contract Drawings. d. Finish: Mill.

2.3 SHEET METAL MATERIALS

A. Recycled Content of Sheet Metal Materials: Postconsumer recycled content plus one-half of preconsumer recycled content not less than 10 percent by weight.

B. Copper Sheet: ASTM B 370; Temper H00, cold rolled unless Temper 060 is required for forming.

1. Mill Finish: Nonpatinated and exposed.

2.4 ACCESSORIES

A. General: Provide materials and types of fasteners, protective coatings, separators, sealants, and other accessory items as required for a complete roofing system and as recommended by metal-shingle manufacturer unless otherwise indicated.

B. Sheet Metal Flashing and Trim: Metal-shingle manufacturer's flashing and trim components matching shingle material, color, and finish unless otherwise indicated or recommended in writing by metal-shingle manufacturer. Fabricate to sizes and configurations shown or required. Unless otherwise indicated, fabricate sheet metal flashing and trim to comply with recommendations that apply to design, dimensions, metal, and other characteristics of the item in SMACNA's "Architectural Sheet Metal Manual."

C. Bituminous Coating: Cold-applied asphalt emulsion complying with ASTM D 1187D 1187M.

D. Asphalt Roofing Cement: ASTM D 4586, Type II, asbestos free.

E. Sealant: ASTM C 920, one-part elastomeric polymer joint sealant as recommended by metal-shingle manufacturer for installation indicated; of Type, Grade, Class, and Use classifications required to seal joints in metal shingles and remain watertight. Where sealant is exposed, provide in color matching shingle.

F. Sheet Metal Fasteners: Noncorrosive screws, nails, and anchors designed to withstand design loads as recommended in writing by metal-shingle manufacturer.

1. Exposed Fasteners: Heads matching color of metal shingles using plastic caps or factory-applied coating. Provide metal-backed EPDM or PVC washers under heads of exposed fasteners bearing on weather side of shingles.

METAL SHINGLES


2. Fasteners for Flashing and Trim: Blind fasteners or self-drilling screws, gasketed, with hex-washer head.

3. Blind Fasteners: High-strength aluminum or stainless-steel rivets suitable for metal being fastened.

4. Fasteners for Copper Sheet: Series 300 stainless steel.

2.5 GENERAL FINISH REQUIREMENTS

A. Protect mechanical and painted finishes on exposed surfaces from damage by applying a strippable, temporary protective covering before shipping.

B. Appearance of Finished Work: Noticeable variations in same piece are unacceptable. Variations in appearance of adjoining components are acceptable if they are within the range of approved Samples and are assembled or installed to minimize contrast.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of the Work.

1. Examine roof sheathing to verify that sheathing joints are supported by framing and blocking, that tops of fasteners are flush with surface, and that installation is within flatness tolerances.

2. Verify that substrate is sound, dry to the maximum moisture content recommended by metal-shingle manufacturer, smooth, clean, sloped for drainage, and completely anchored and that provision has been made for flashings and penetrations through metal shingles.

3. Verify that vent stacks and other penetrations through metal shingles have been installed and are securely fastened.

B. Prepare written report, endorsed by Installer, listing conditions detrimental to performance of the Work.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 METAL-SHINGLE INSTALLATION

A. General: Install underlayment and metal shingles according to manufacturer's written instructions applicable to products and applications indicated; install level, plumb, and true to line.

METAL SHINGLES


B. Maintain uniform exposure and coursing of metal shingles throughout roof.

C. Apply sealant between shingles, flashing, trim, and exposed fasteners to achieve a weathertight system.

D. Interlock and overlap shingles, and stagger end joints from shingle courses above and below as indicated on Drawings.

E. Metal Protection: Where dissimilar metals contact each other, protect against galvanic action by painting contact surfaces with bituminous coating, by applying self-adhering sheet underlayment to each contact surface, or by other permanent separation as recommended by manufacturer of metal shingles or of the metals in contact.

1. Do not use graphite pencils to mark metal surfaces.

3.3 ACCESSORY INSTALLATION

A. General: Install accessories according to manufacturers' written instructions unless more stringent requirements are indicated.

B. Metal Flashings and Trim: Install metal flashings and trim according to recommendations in NRCA's "The NRCA Roofing Manual: Steep-Slope Roof Systems" unless more stringent requirements are indicated.

C. Metal Protection: Where dissimilar metals contact each other, protect against galvanic action by painting contact surfaces with bituminous coating, by applying self-adhering sheet underlayment to each contact surface, or by other permanent separation as recommended by manufacturer of metal shingles or of the metals in contact.

3.4 ERECTION TOLERANCES

A. Installation Tolerances: Shim and align metal shingles within installed tolerance of 1/4 inch in 20 feet (6 mm in 6 m) on slope and location lines as indicated and within 1/8-inch (3-mm) offset of adjoining faces and of alignment of matching profiles.

3.5 ADJUSTING

A. Remove and replace damaged or deformed metal shingles and metal shingles that do not comply with specified requirements. Replace shingles with damaged or deteriorated finishes and other components of the Work that cannot be successfully repaired by finish touchup or similar minor repair procedures.

B. Remove temporary protective coverings and strippable films as metal shingles are installed unless otherwise indicated in manufacturer's written installation instructions.

METAL SHINGLES


C. On completion of installation, clean exposed surfaces of metal shingles and touch up minor nicks and abrasions in finish, according to manufacturer's written instructions. Remove excess sealants.


Tel. 203 230 9007 Fax. 203 230 82473190 Whitney Avenue, Hamden, CT 06518-2340

SILVER / PETRUCELLI + ASSOCIATES

Norwalk City Hall Dome Repairs

Norwalk, Connecticut

City of Norwalk

125 East AvenueA1

Dome Plans & Details

PURCHASING DEPARTMENT

The bid listed below has had addenda issued. Documents are available over the Internet at http://www.norwalkct.org Adobe Acrobat reader is required to view this document. If you do not have this software you may down load it for free from Adobe. The document number to request will be the same as the project number indicated below

Project # Addendum # # of pages Original Issue Date

3530 1 2 March 31, 2015

Date

April 14, 2015

Project Number

3530 .

Addenda Number

1

Deadline

2:00 PM

April 23, 2015 Project Title

Dome Roof & Window Replacement – Norwalk City Hall

This Addendum is a contract document modifying previously issued documents, which remain in full force except as specifically modified below. Quotations appearing on the Proposal are to reflect the provisions of this Addendum. Failure to acknowledge receipt of this Addendum in the space provided on the response sheet may subject candidate to disqualification. New Information

1. A pre-bid conference for this project was held 10:00 a.m., Wednesday, April 8, 2015, at

Norwalk City Hall, Room 101, 125 East Avenue, Norwalk, CT 06851. A copy of the sign-in sheet from that pre-bid conference is attached to this addendum [One (1) page].

2. To schedule an additional visit to the view the project area, please contact the City’s

Building Management Department. The point of contact in the Building Management Department for this project is Mr. Michael Sgobbo. Mr. Sgobbo can be reached via telephone at 203.854.7709 or via e-mail at [email protected]

End of Addendum #1