SECTION_07_61_00_-_SHEET_METAL_ROOFING_-_Updated_0005.pdf

CAHA - 213068 and 319351 07 61 00 - 1

SHEET METAL ROOFING

SECTION 07 61 00 - SHEET METAL ROOFING

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. Work for this Project involves the restoration and rehabilitation of a historic landmark. Treat the building and site respectfully. Carefully respect existing conditions and treat existing materials as irreplaceable. Do not remove, alter or disfigure any existing materials, elements or finishes unless indicated on the Drawings or in the Specifications. If any work impacts existing materials or finishes to remain, notify Contracting Officer in writing at least ten days in advance of the start of the work, and obtain written response prior to proceeding with the work.

B. Section Includes:

1. Custom-fabricated, standing-seam sheet metal roofing.

C. Related Requirements:

1. Section 02 42 96 "Historic Removal and Dismantling" for removal of roofing, and of certain adjoining materials and reuse.

2. 05 03 83 "Historic Cast Iron Repair" for the repair of existing roof supporting cast iron and steel components.

3. Section 07 92 00 "Joint Sealants" for field-applied sealants adjoining sheet metal roofing and not otherwise specified in this Section.

1.3 COORDINATION

A. It is intended to accurately recreate the appearance of the original sheet metal roof, unless otherwise indicated in the Construction Documents.

B. Thoroughly measure and document the raised features on the existing copper roof panels and recreate them on the new replacement panels.

C. Coordinate sheet metal roofing panel layout and seams with the locations of the existing support structure below.

D. Coordinate sheet metal roofing installation with rain drainage work, flashing, trim, and construction of roofing substrate, parapets, walls, and other adjoining work to provide leakproof, secure, and noncorrosive installation.

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1.4 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site .

1. Review construction schedule. Verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.

2. Review special roofing details and condition of other construction that affect sheet metal roofing.

3. Review requirements for insurance and certificates if applicable.

4. Review roof observation and repair procedures after sheet metal roofing installation.

1.5 ACTION SUBMITTALS

A. Product Data: For each of the following:

1. Roofing sheet metal.

2. Dissimilar metals separation materials.

3. Underlayment materials.

4. Fasteners.

5. Elastomeric sealant.

6. Butyl sealant.

B. Shop Drawings:

1. Include plans, elevations, sections, and attachment details. Accurately show adjoining existing and new construction, including existing underlying structure and reinstallation of the existing ventilator cap at the peak.

2. Detail fabrication and panel installation layouts and keyed details. Distinguish between shop- and field-assembled Work.

3. Include details for forming, including seams and dimensions.

4. Include details for joining and securing, including layout and spacing of fasteners, cleats, and other attachments. Include pattern of seams.

5. Include details of roof penetrations.

6. Include details of edge conditions, including eaves and ridges.

7. Include details of special conditions.

8. Include details of connections to adjoining work.

C. Samples: For each exposed product and for each color and texture specified, 12 inches square.

1.6 INFORMATIONAL SUBMITTALS

A. Qualification Data: For Installer and fabricator.

1. Include listing of completed projects of comparable scale of this Project, including name, address, telephone, and contact person for Architect, and name, address, telephone number, and contact person for building Owner.

2. Certification Testing results for any roofing installer and fabricator soldering assemblies to be part of the roofing.

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a. Conduct solder joint testing at least 30 days in advance of start of sheet metal fabrication and installation activities for all roofing workers performing soldering work.

b. Submit 3 samples of each type of solder joint to be performed on this project from each installer/fabricator for review by the Contracting Officer for acceptable quality and appearance of work.

1) Linear joint samples shall be at least 12" long. Include rivets or pins where called for in the joint type by the Construction Documents.

B. Sample Warranties: For special warranties.

1.7 CLOSEOUT SUBMITTALS

A. Maintenance Data: For roofing sheet metals and accessories to include in maintenance manuals.

B. Special warranties.

1.8 QUALITY ASSURANCE

A. Sheet Metal Roofing Fabricator Qualifications: Employs skilled workers who custom fabricate sheet metal roofing similar to that required for this Project and whose products have a record of successful in-service performance.

1. Fabricator must have at least 10 years of successful experience with copper sheet metal roof fabrication.

B. Mockups: Build mockups to verify selections made under Sample submittals, to demonstrate aesthetic effects, and to set quality standards for fabrication and installation.

1. Build mockup of typical roof area and eave as shown on Drawings, including separation materials between dissimilar metals, attachments, and accessories.

a. Size: Typical roof panel .

b. Include each type of exposed seam and seam termination fascia pressed raised surface pattern and eave and ridge termination.

2. Approval of mockups does not constitute approval of deviations from the Contract

Documents contained in mockups unless Contracting Officer 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 sheet metal roofing materials in contact with other materials that might cause staining, denting, or other surface damage.

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1. Store sheet metal roofing materials away from uncured concrete and masonry.

2. Protect stored sheet metal roofing materials from contact with water.

B. Protect strippable protective covering on sheet metal roofing from exposure to sunlight and high humidity, except to extent necessary for period of sheet metal roofing installation.

1.10 WARRANTY

A. Special Warranty: Warranty form at end of this Section in which Installer agrees to repair or replace components of sheet metal roofing that fail in materials or workmanship within specified warranty period.

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

a. Structural failures, including, but not limited to, rupturing, cracking, or puncturing.

b. Wrinkling or buckling.

c. Loose parts.

d. Failure to remain weathertight, including uncontrolled water leakage.

e. Deterioration of metals, metal finishes, and other materials beyond normal weathering, including nonuniformity of color or finish.

f. Galvanic action between sheet metal roofing and dissimilar materials.

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

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. General Performance: Sheet metal roofing system, including, but not limited to, metal roof panels, cleats, anchors and fasteners, sheet metal flashing integral with sheet metal roofing, fascia panels, trim, separating materials between dissimilar metals, and accessories, shall comply with requirements without failure due to defective manufacture, fabrication, or installation, or due to other defects in construction. Sheet metal roofing shall remain watertight.

B. Copper Roofing Standard: Comply with CDA's "Copper in Architecture Handbook." Conform to dimensions and profiles shown unless more stringent requirements are specified or indicated on

Drawings.

C. Thermal Movements: Allow for thermal movements from ambient and surface temperature changes to prevent buckling, opening of joints, overstressing of components, failure of joint sealants, failure of connections, and other detrimental effects.

1. Temperature Change: 120 deg F , ambient; 180 deg F , material surfaces .

2.2 ROOFING SHEET METALS

A. Protect mechanical and other finishes on exposed surfaces from damage by applying strippable, temporary protective film before shipping.

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B. Copper Sheet: ASTM B370 cold-rolled copper sheet, H00 temper.

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

a. Hussey Copper Ltd.

b. Revere Copper Products, Inc.

2. Weight (Thickness): 88 oz./sq. ft. (1/8" thick) 24 oz./sq. ft. [AMENDMENT NO. 3] unless otherwise indicated.

3. Prepatinated Copper-Sheet Finish: Dark brown , prepatinated according to

ASTM B882. Painted Finish: PTS-4A (Black). Refer to Section 09 96 00 High-

Performance Coatings [AMENDMENT NO. 3]

2.3 UNDERLAYMENT MATERIALS

A. Self-Adhering, High-Temperature Sheet Underlayment: Minimum 30 mils thick, consisting of a slip-resistant polyethylene- or polypropylene-film top surface laminated to a layer of butyl- or

SBS-modified asphalt adhesive, with release-paper backing; specifically designed to withstand high metal temperatures beneath metal roofing. Provide primer according to written recommendations of underlayment manufacturer.

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

a. GCP Applied Technologies Inc.

b. Henry Company.

c. Owens Corning.

2. Thermal Stability: ASTM D1970/D1970M; stable after testing at 240 deg F or higher.

3. Low-Temperature Flexibility: ASTM D1970/D1970M; passes after testing at minus 20 deg F or lower.

B. Slip Sheet: Rosin-sized building paper, 3 lb/100 sq. ft. minimum.

2.4 MISCELLANEOUS MATERIALS

A. Provide materials and types of fasteners, solder, protective coatings, sealants, and other miscellaneous items as required for complete roofing system and as recommended by primary sheet metal manufacturer unless otherwise indicated.

B. Fasteners: Screws, self-locking rivets and bolts, and other suitable fasteners designed to withstand design loads.

1. General:

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

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b. Fasteners for Flashing and Trim: Blind fasteners or self-drilling screws, gasketed;

with hex-washer head.

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

2. Fasteners for Copper Sheet: Copper, hardware bronze, or passivated Type 316 stainless steel.

a. Rivets in copper sheet shall be copper. Do not use pop rivets.

C. Solder:

1. For Copper : ASTM B32, Grade Sn50, 50 percent tin and 50 percent lead .

2. Separation materials for dissimilar metals:

a. Self-Adhering, High-Temperature Sheet: Minimum 30 mils thick, consisting of a polyethylene- or polypropylene-film top surface laminated to a layer of butyl- or

SBS-modified asphalt adhesive, with release-paper backing; specifically designed to withstand high metal temperatures beneath metal roofing. Provide primer according to written recommendations of underlayment manufacturer.

1) Thermal Stability: ASTM D 1970; stable after testing at 240 deg F or higher.

2) Low-Temperature Flexibility: ASTM D 1970; passes after testing at minus

20 deg F or lower.

b. High-Temperature EPDM Sheet: Minimum 30 mils thick.

1) Thermal Stability: Stable after testing at 240 deg F or higher.

2) Bituminous Coating: Cold-applied asphalt emulsion according to ASTM

D1187.

D. Sealant Tape: Pressure-sensitive, 100 percent solids, polyisobutylene compound sealant tape with release-paper backing. Provide permanently elastic, nonsag, nontoxic, nonstaining tape 1/2 inch wide and 1/8 inch thick.

E. Elastomeric Sealant: ASTM C920, elastomeric polyurethane polymer sealant; of type, grade, class, and use classifications required to seal joints in sheet metal roofing and remain watertight.

F. Butyl Sealant: ASTM C1311, single-component, solvent-release butyl rubber sealant;

polyisobutylene plasticized; heavy bodied for hooked-type expansion joints with limited movement.

G. Bituminous Coating: Cold-applied asphalt emulsion according to ASTM D1187.

2.5 ACCESSORIES

A. Sheet Metal Accessories: Provide components required for complete sheet metal roofing assembly, including trim, fasciae, corner units, clips, flashings, sealants, gaskets, fillers, metal closures, closure strips, and similar items. Match material and finish of sheet metal roofing unless otherwise indicated.

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1. Cleats: Intermittent and continuous attachment devices for mechanically seaming into joints and formed from the following materials and thicknesses unless otherwise indicated:

a. Copper Roofing: 24- oz./sq. ft. copper sheet.

2. Roofing Attachment Clip Angles and Screws: Intermittent bent copper attachment angles (to be replace existing clip angles screwed to sides of rafters at underside of sheet metal roofing):

a. Clip Angles: Copper, minimum 1/8" thick, match or exceed dimensions of existing clip angles.

b. Screws to Rafters: Type 316 stainless steel. Match size of existing screws to thread into existing holes on sides of rafters.

[AMENDMENT NO. 3]

3. Backing Plates: Plates at roofing splices, fabricated from material recommended by

SMACNA's "Architectural Sheet Metal Manual."

4. Closure Strips: Closed-cell, expanded, cellular, rubber or crosslinked, polyolefin foam or closed-cell laminated polyethylene; minimum 1-inch- thick, flexible-closure strips; cut or premolded to match sheet metal roofing profile. Provide closure strips where necessary to ensure weathertight construction.

5. Flashing and Trim: Formed from same material and with same finish as sheet metal roofing, minimum 0.018 inch thick.

2.6 FABRICATION

A. Field measure every existing roofing panel and underlying roofing support and framing member to provide complete information for accurately fabricating and recreating the copper roof.

1. Refer to the Drawings for variations from the existing roofing.

B. Custom fabricate sheet metal roofing to match original appearance of the existing roofing and to comply with details shown and recommendations in Copper Development Association's "Copper in Architecture Design Handbook" that apply to design, dimensions (panel width and seam height), geometry, metal thickness, and other characteristics of installation. Fabricate sheet metal roofing and accessories in shop to greatest extent possible.

1. Standing-Seam Roofing: Form standing-seam panels with finished seam height to match height of existing standing seam, but not less than 1" .

C. Fabrication Tolerances: Fabricate sheet metal roofing that is capable of installation to a tolerance of 1/4 inch in 20 feet on slope and location lines indicated on Drawings and within 1/8-inch offset of adjoining faces and of alignment of matching profiles.

D. Form exposed sheet metal work to fit support system with little oil canning; free of buckling and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.

1. Each plane of the roof shall be a panel fabricated from a single sheet of copper. intermediate seams are not allowed.

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2. Fold and cleat eaves in shop.

3. Form and fabricate sheets, seams, strips, edge treatments, integral flashings, and other components of metal roofing to profiles, patterns, and drainage arrangements indicated on

Drawings and as required for leakproof construction.

E. Expansion Provisions: Fabricate sheet metal roofing to allow for expansion in running work sufficient to prevent leakage, damage, and deterioration of the Work.

1. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with butyl sealant concealed within joints.

2. Use lapped expansion joints only where indicated on Drawings.

F. Sealant Joints: Where movable, nonexpansion-type joints are required, form metal to provide for proper installation of elastomeric sealant according to Copper Development Association's

"Copper in Architecture Design Handbook"

G. Sheet Metal Accessories: Custom fabricate flashings and trim to comply with recommendations in Copper Development Association's "Copper in Architecture Design Handbook" that apply to design, dimensions, metal, and other characteristics of item required. Obtain field measurements for accurate fit before shop fabrication.

1. Form exposed sheet metal accessories without excessive oil canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.

2. Seams: Fabricate nonmoving seams with flat-lock seams. Tin edges to be seamed, form seams, and solder.

3. Conceal fasteners and expansion provisions where possible. Do not use exposed fasteners on faces of accessories exposed to view.

4. Fabricate cleats and attachment devices of sizes recommended by Copper Development

Association's "Copper in Architecture Design Handbook" for application, but not less than thickness of metal being secured.

H. Label roofing pieces in shop to assure accurate final placement.

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

PART 3 - EXECUTION

3.1 EXAMINATION

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

1. Verify that support structure is sound, smooth, clean, sloped for drainage, and completely anchored, and that provision has been made for attachments to and penetrations through sheet metal roofing.

B. Examine roughing-in for components and systems penetrating sheet metal roofing to verify actual locations of penetrations relative to seam locations of sheet metal roofing before installation.

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

Work.

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

3.2 PREPARATION

A. Lay out panel arrangement before installation of sheet metal roofing.

3.3 INSTALLATION OF UNDERLAYMENT

A. Self-Adhering High-Temperature Sheet Underlayment:

1. Install self-adhering high-temperature sheet underlayment, wrinkle free.

2. Prime substrate if recommended by underlayment manufacturer.

3. Comply with temperature restrictions of underlayment manufacturer for installation; use primer for installing underlayment at low temperatures.

4. Apply in shingle fashion to shed water, with end laps of not less than 6 inches staggered

24 inches between courses.

5. Overlap side edges not less than 3-1/2 inches.

6. Roll laps and edges with roller.

7. Cover underlayment within 14 days of installation.

8. Install self-adhering high-temperature underlayment at the following locations:

a. Over entire roof.

B. Install slip sheet, wrinkle free, over underlayment before installing sheet metal roofing and related flashing.

1. Install in shingle fashion to shed water, with lapped joints of not less than 4 inches.

C. Install membrane type separation materials at all locations needed to prevent direct contact between dissimilar metal components.

1. Locations include, but are not necessarily limited to:

a. Between iron support structure and underside of copper roofing.

b. Between sides of iron rafters and copper clip angles.

c. All other contact points between copper and iron or steel components.

2. Size, cut, and trim separation materials so that the face of the material is concealed by the metal components, and the edges of the material do not extend beyond the extent of the smaller metal component.

3.4 INSTALLATION OF SEPARATION MATERIALS

A. Install membrane type separation materials at all locations needed to prevent direct contact between dissimilar metal components.

1. Locations include, but are not necessarily limited to:

a. Between iron support structure and underside of copper roofing.

b. Between sides of iron rafters and copper clip angles.

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c. All other contact points between copper and iron or steel components.

2. Size, cut and trim separation materials so that the face of the material is concealed by the metal components, and the edges of the material do not extend beyond the extent of the smaller metal component.

3.5 INSTALLATION, GENERAL

A. Install sheet metal roofing to comply with details shown and recommendations in Copper

Development Association's "Copper in Architecture Design Handbook" that apply to installation characteristics required unless otherwise indicated on Drawings.

1. Install fasteners , solder, protective coatings, separators, sealants, and other miscellaneous items as required for complete roofing system.

2. Install sheet metal roofing true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of solder and rivet.

3. Anchor sheet metal roofing and other components of the Work securely in place, with provisions for thermal and structural movement.

4. Do not field cut sheet metal roofing by torch.

5. Provide metal closures at peaks and eaves.

6. Flash and seal sheet metal roofing with closure strips at eaves, rakes, and perimeter of all openings. Fasten with self-tapping screws.

7. Locate and space fastenings in uniform vertical and horizontal alignment. Predrill panels for fasteners.

8. Lap metal flashing over sheet metal roofing to direct moisture to run over and off roofing.

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

B. Fasteners: Use fastener sizes that penetrate wood blocking or sheathing not less than 1-1/4 inches for nails and not less than 3/4 inch for wood screws .

C. Roofing Attachment to Rafters: Braze each copper clip angle (attached to the rafters) to the underside of the copper roofing.

D. Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating, by applying self-adhering sheet underlayment to each contact surface, or by other permanent separation as recommended in Copper Development

Association's "Copper in Architecture Design Handbook"

E. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation.

F. Fasciae:

1. Align bottom of sheet metal roofing and fasten with blind rivets, bolts, or self-tapping screws.

2. Flash and seal sheet metal roofing with closure strips where fasciae meet soffits, along lower panel edges, and at perimeter of all openings.

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3.6 INSTALLATION OF CUSTOM-FABRICATED SHEET METAL ROOFING

A. Install sheet metal roofing system with lines and corners of exposed units true and accurate.

1. Form exposed faces flat and free of buckles, excessive waves, and avoidable tool marks, considering metal temper and reflectivity.

2. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant.

3. Fold back sheet metal to form hem on concealed side of exposed edges unless otherwise indicated.

4.

B. Attach sheet metal roofing panels to structural support system.

1. Attach copper roof attachment clip angles to sides of rafters with stainless steel screws in existing holes in rafters; minimum 6 per each side of rafter, evenly spaced.

a.

2. Braze the sheet metal roofing panels to each copper clip angle at the underside of the roofing panels.

C. Install cleats to hold sheet metal roofing panels in position.

1. Attach each cleat with at least two fasteners to prevent rotation.

2. Space cleats not more than 12 inches o.c.

3. Bend tabs over fastener head.

4. Provide expansion-type cleats for roof panels that exceed 30 feet in length.

D. Soldered Joints: Clean surfaces to be soldered, removing oils and foreign matter.

1. Pre-tin edges of sheets with solder to a width of 1-1/2 inches; however, reduce pre-tinning where pre-tinned surface would show in completed Work.

a. Pre-tin as close to time of soldering as practical. Remove all oxidation immediately prior to soldering.

2. Do not pre-tin zinc-tin alloy-coated copper.

3. Do not use torches for soldering. Torch heated irons are allowed.

4. Heat surfaces to receive solder, and flow solder into joint.

a. Fill joint completely.

b. Completely remove flux and spatter from exposed surfaces.

5. Copper Soldering: Tin edges of uncoated sheets, using solder for copper.

6. Standing seam joints are to be fully soldered along their entire length.

E. Standing-Seam Roofing:

1. Attach sheet metal roofing panels to structural support system.

a. Attach copper roof attachment clip angles to sides of rafters with stainless steel screws in existing holes in rafters; minimum 6 per each side of rafter, evenly spaced.

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1) Provide separation material between copper clip angles and rafters to prevent contact between dissimilar metals.

b. Braze the sheet metal roofing panels to each copper clip angle at the underside of the roofing panels.

2. Attach standing-seam metal panels to substrate with double-fastened cleats spaced at 12 inches o.c.

3. Install panels reaching from eave to peak before moving to adjacent panels.

4. Form standing seam by folding a vertical leg, the height of the standing seam, on the edge of one panel. On the adjacent panel, fold the adjoining edge up along the vertical leg of the first panel then fold 180 degrees back down along the opposite side of the first panel's vertical leg.

a. Install (1) 3/16" diameter rivet in the vertical standing seam at the center and at each of the first and last 1/6 points along the length of the seam (3 rivets per standing seam) prior to soldering the standing seam. Rivets shall be of the same material as the sheet metal roofing.

b. Fully solder standing seams along their entire length and fully solder over the rivets.

5. Leave seams upright after locking at ridges and hips.

3.7 INSTALLATION OF ACCESSORIES

A. Install accessories with positive anchorage to building and weathertight mounting, and provide for thermal expansion.

1. Coordinate installation with flashings and other components.

2. Install components required for complete sheet metal roofing assembly, including trim, seam covers, flashings, sealants, gaskets, fillers, metal closures, closure strips, and similar items.

3. Install accessories integral to sheet metal roofing that are specified in Section 07 62 00

"Sheet Metal Flashing and Trim" to comply with that Section's requirements.

B. Flashing and Trim: Comply with performance requirements and Copper Development

Association's "Copper in Architecture Design Handbook".

1. Provide concealed fasteners where possible, and install units true to line, levels, and slopes.

2. Install work with laps, joints, and seams that are permanently watertight and weather resistant.

3. Install flashing and trim as required to seal against weather and to provide finished appearance, including, but are not limited to, eaves, corners, peaks, fasciae, and fillers.

4. Install continuous strip of self-adhering underlayment at edge of continuous flashing overlapping self-adhering underlayment, where "continuous seal strip" is indicated in

SMACNA's "Architectural Sheet Metal Manual" and on Drawings.

5. Install exposed flashing and trim without excessive oil canning, buckling, and tool marks;

true to line, levels, and slopes; and with exposed edges folded back to form hems.

6. Install sheet metal flashing and trim to fit substrates, and to result in waterproof and weather-resistant performance.

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3.8 INSTALLATION TOLERANCES

A. Installation Tolerances: Shim and align sheet metal roofing within installed tolerance of 1/4 inch in 20 feet on slope and location lines indicated on Drawings and within 1/8-inch offset of adjoining faces and of alignment of matching profiles.

3.9 CLEANING

A. Clean exposed metal surfaces of substances that interfere with uniform oxidation and weathering.

B. On completion of sheet metal roofing installation, clean finished surfaces as recommended by sheet metal roofing manufacturer.

C. Clean and neutralize flux materials. Clean off excess solder.

D. Clean off excess sealants.

3.10 PROTECTION

A. Remove temporary protective coverings and strippable films as sheet metal roofing is installed unless otherwise indicated in manufacturer's written installation instructions.

B. Prohibit traffic of any kind on installed sheet metal roofing.

C. Maintain sheet metal roofing in clean condition during construction.

D. Replace sheet metal roofing components that have been damaged or have deteriorated beyond successful repair by finish touchup or similar minor repair procedures, as determined by

Contracting Officer.

3.11 ROOFING INSTALLER'S WARRANTY

A. WHEREAS <Insert name> of <Insert address>, herein called the "Roofing Installer," has performed roofing and associated work ("work") on the following project:

1. Owner: National Park Service .

2. Owner's Address: .

3. Building Name/Type: Cape Hatteras Lighthouse .

4. Building's Address: 46379 Lighthouse Road, Buxton, North Carolina .

5. Area of Work: <Insert information>.

6. Acceptance Date: <Insert date>.

7. Warranty Period: <Insert time>.

8. Expiration Date: <Insert date>.

B. AND WHEREAS Roofing Installer has contracted (either directly with Owner or indirectly as a subcontractor) to warrant said work against leaks and faulty or defective materials and workmanship for designated Warranty Period, CAHA - 213068 and 319351 07 61 00 - 14

C. NOW THEREFORE Roofing Installer hereby warrants, subject to terms and conditions herein set forth, that during Warranty Period Roofing Installer will, at Roofing Installer's own cost and expense, make or cause to be made such repairs to or replacements of said work as are necessary to correct faulty and defective work and as are necessary to maintain said work in a watertight condition.

D. This Warranty is made subject to the following terms and conditions:

1. Specifically excluded from this Warranty are damages to work and other parts of the building, and to building contents, caused by:

a. Lightning;

b. Peak gust wind speed exceeding <Insert mph>;

c. Fire;

d. Failure of roofing system substrate, including cracking, settlement, excessive deflection, deterioration, and decomposition;

e. Faulty construction of parapet walls, chimneys, skylights, vents, equipment supports, and other edge conditions and penetrations of the work;

f. Vapor condensation on bottom of roofing; and

g. Activity on roofing by others, including construction contractors, maintenance personnel, other persons, and animals, whether authorized or unauthorized by

Owner.

2. When work has been damaged by any of foregoing causes, Warranty shall be null and void until such damage has been repaired by Roofing Installer and until cost and expense thereof have been paid by Owner or by another responsible party so designated.

3. Roofing Installer is responsible for damage to work covered by this Warranty but is not liable for consequential damages to building or building contents resulting from leaks or faults or defects of work.

4. During Warranty Period, if Owner allows alteration of work by anyone other than Roofing

Installer, including cutting, patching, and maintenance in connection with penetrations, attachment of other work, and positioning of anything on roof, this Warranty shall become null and void on date of said alterations, but only to the extent said alterations affect work covered by this Warranty. If Owner engages Roofing Installer to perform said alterations, Warranty shall not become null and void unless Roofing Installer, before starting said work, shall have notified Owner in writing, showing reasonable cause for claim, that said alterations would likely damage or deteriorate work, thereby reasonably justifying a limitation or termination of this Warranty.

5. During Warranty Period, if original use of roof is changed and it becomes used for, but was not originally specified for, a promenade, work deck, spray-cooled surface, flooded basin, or other use or service more severe than originally specified, this Warranty shall become null and void on date of said change, but only to the extent said change affects work covered by this Warranty.

6. Owner shall promptly notify Roofing Installer of observed, known, or suspected leaks, defects, or deterioration and shall afford reasonable opportunity for Roofing Installer to inspect work and to examine evidence of such leaks, defects, or deterioration.

7. This Warranty is recognized to be the only warranty of Roofing Installer on said work and shall not operate to restrict or cut off Owner from other remedies and resources lawfully available to Owner in cases of roofing failure. Specifically, this Warranty shall not operate to relieve Roofing Installer of responsibility for performance of original work according to requirements of the Contract Documents, regardless of whether Contract was a contract directly with Owner or a subcontract with Owner's General Contractor.

CAHA - 213068 and 319351 07 61 00 - 15

E. IN WITNESS THEREOF, this instrument has been duly executed this <Insert day> day of

<Insert month> , <Insert year>.

1. Authorized Signature: <Insert signature>.

2. Name: <Insert name>.

3. Title: <Insert title>.

END OF SECTION 07 61 00