FS Roofing Specifications.docx

Helena-Lewis and Clark National Forest FOREST WIDE ROOF REPLACEMENTS Specifications

FOREST SERVICE

SPECIFICATIONS

FOREST WIDE ROOF REPLACEMENTS

HELENA-LEWIS AND CLARK NATIONAL FOREST

MONTANA

TABLE OF CONTENTS

SECTION 061600 – ROOF SHEATHING

PART 1 - GENERAL

1.1 SUMMARY

A. Make repairs to damaged or rotten roof sheathing as needed.

B. Section Includes:

1. Roof sheathing.

PART 2 - PRODUCTS

2.1 WOOD PANEL PRODUCTS

A. Sheathing type and thickness shall match existing roof sheathing to be repaired.

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

2.2 ROOF SHEATHING

A. Plywood Sheathing, Roofs: Exterior sheathing.

1. Span Rating: Not less than 24/0

2. Nominal Thickness: Not less than 15/32 inch (11.9 mm).

B. Oriented-Strand-Board Sheathing, Roofs:

1. Span Rating: Not less than 24/0.

2. Nominal Thickness: Not less than 15/32 inch (11.9 mm).

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 2304.10.1, "Fastening Schedule," in the ICC's International Building Code.

2. Table R602.3(1), "Fastener Schedule for Structural Members," and Table R602.3(2), "Alternate Attachments," in the ICC's International Residential Code for One- and Two-Family Dwellings.

3. ICC-ES evaluation report for fastener.

D. 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.

END OF SECTION 061600

SECTION 070150.19 - PREPARATION FOR REROOFING

1. GENERAL

SUMMARY

Full tear-off of entire roof.

Removal of flashings and counterflashings.

Repairs to sheathing.

FIELD CONDITIONS

Owner will occupy portions of building immediately below reroofing area.

EXECUTION

Full Roof Tear-off: Roofing and roofing system components down to roof deck removed.

Cover holes and replace damaged sheathing as necessary to provide a continuous roof deck.

END OF SECTION 070150.19

SECTION 073113 - ASPHALT SHINGLES

0. WARRANTY

Workmanship Warranty Period: 30 years minimum.

Roofing Installer's Warranty Period: 2 years minimum.

PERFORMANCE REQUIREMENTS

Comply with Section R905.2 of the 2021 International Residential Code.

Exterior Fire-Test Exposure: Class A.

Wind Resistance: ASTM D3161/D3161M, Class F, and with ASTM D7158/D7158M, Class H.

Maximum Winds Speed: 110 mph (49 m/s) Energy Performance: ENERGY STAR.

PRODUCTS

Glass-Fiber-Reinforced Asphalt Shingles: Impact-resistant, three-tab-strip type.

Hip and Ridge Shingles: Standard units.

Underlayment Materials: Organic felt, asphalt saturated; Glass-reinforced felt, asphalt saturated; Synthetic underlayment; Self-adhering, polymer-modified bitumen sheet.

Ridge Vents: Rigid, high-density plastic.

Metal Flashing and Trim: Zinc-tin alloy coated copper; Anodized aluminum; Aluminum, mill finished, or other approved corrosion resistant material.

EXECUTION

INSTALLATION

Underlayment: Single layer.

Water and Ice-Dam Membrane: Self-adhering, polymer-modified bitumen sheet.

Ice Barrier shall extend from the lowest edges of all roof surfaces to a point not less than 24 inches inside the exterior wall line of the building.

Valleys: Woven; Closed cut; Metal flashed, open.

END OF SECTION 073113

SECTION 074113 - STANDING-SEAM METAL ROOF PANELS

0. QUALITY ASSURANCE

Manufacturer Qualifications:

Company specializing in manufacturing products specified in this section, with not less than three (3) years of documented experience.

Installer Qualifications:

Company trained and authorized by roofing system manufacturer.

WARRANTY

Finishes: 20 years.

Weathertightness: 20 years.

PERFORMANCE REQUIREMENTS

Comply with Section R905.10 of the 2021 International Residential Code.

Wind Speed: 110 (49 m/s) Energy Performance: ENERGY STAR Minimum Thickness: 26 Gauge

PRODUCTS

ARCHITECTURAL METAL ROOF PANELS

Provide complete engineered system complying with specified requirements and capable of remaining weathertight while withstanding anticipated movement of substrate and thermally induced movement of roofing system.

Metal Panels: Factory-Formed panels with Factory-Applied finish.

Minimum 26 gauge thick, precoated steel sheet Standing Seam Striated Profile, with 1-1/2” seam height.

Panel Widths: 16 inches Floating Concealed Clip System Roof Panels to be Continuous single panels, unspliced on each side of the edge.

Color: To be chosen from Manufacturer's full range of color

ATTACHMENT SYSTEM

Floating Concealed System: Provide manufacturer’s standard stainless steel or nylon-coated aluminum concealed anchor clips designed for specific roofing system and engineered to meet performance requirements, including anticipated thermal movement.

ACCESSORIES

Miscellaneous Sheet Metal Items:

Provide flashings, gutters, downspouts, trim, moldings, closure strips, preformed crickets, caps and equipment curbs of the same material, thickness, and finish as used for the roofing panels.

Rib and Ridge Closures:

Provide prefabricated, close-fitting components of steel with corrosion resistant finish or combination steel and closed-cell foam.

Sealants:

Exposed: Elastomeric; silicone, polyurethane, or silyl-terminated polyether/polyurethane.

Concealed: Non-curing butyl sealant or tape sealant.

Underlayment: High-Temperature sheet underlayment Coated Woven Synthetic.

Ice and Water Shield.

Ridge Vent Type recommended by metal roof manufacturer.

EXECUTION

INSTALLATION

Install roofing system in accordance with manufacturer’s instructions and recommendations, as applicable to specific project conditions. Anchor all components of roofing system securely in place while allowing for thermal and structural movement.

Watertight Installation: Sealant or tape at joints.

Underlayment: Single layer.

END OF SECTION 074113.16

SECTION 077123 – GUTTERS AND DOWNSPOUTS

SUMMARY

Section Includes:

Pre-Finished Aluminum Gutters and Downspouts.

PRODUCTS

MATERIALS

Pre-Finished Aluminum Sheet: ASTM B209 (ASTM B209M).

Gutters: 5” K-Style Downspouts: 3”x4” minimum Finish: Shop pre-coated with modified silicone coating Gauge: 26 gauge minimum Color: As selected from manufacturer’s full range of colors.

COMPONENTS

Anchors and Supports: Profiled to suit gutters and downspouts.

Gutter Supports: Brackets Downspout Supports: Brackets Fasteners Galvanized steel, with soft neoprene washers.

ACCESSORIES

Splash Pads Precast concrete; minimum 3000 psi at 28 days, with minimum 5% air entrainment.

EXECUTION

EXAMINATION

Verify that substrate is sound, dry, smooth, clean, sloped for drainage where applicable, and securely anchored.

Proceed with installation only after unsatisfactory conditions have been corrected.

PREPARATION

Paint concealed metal surfaces and surfaces in contact with dissimilar metals with protective backing paint to a minimum dry film thickness of 15 mil.

INSTALLATION

Install gutters, downspouts, and accessories in accordance with manufacturer’s instructions.

Sheet Metal: Join lengths with formed seams sealed watertight. Flash and seal gutters to downspout and accessories.

Slope gutters 1/8 inch per foot.

Set splash pans under downspouts.

END OF SECTION 077123

SECTION 075323 - ETHYLENE-PROPYLENE-DIENE-MONOMER (EPDM) ROOFING

0. WARRANTY

Manufacturer's Materials and Workmanship Warranty: 20 years minimum.

Installer's Warranty: 2 years.

PERFORMANCE REQUIREMENTS

SPRI's Directory of Roof Assemblies Wind Uplift Load Capacity Listing: 105 psf.

Exterior Fire-Test Exposure: Class A.

PRODUCTS

MATERIALS

Low-emitting adhesives and sealants.

EPDM Roofing: ASTM D4637/D4637M, reinforced, 75 mils (1.9 mm) thick.

Sheet Flashing: 60-mil- (1.5-mm-) thick EPDM.

Protection sheet.

Liquid Coating: Acrylic emulsion or Chlorosulfonated polyethylene (comply with EPDM Manufacturers installation instructions).

Vapor Retarder: Comply with EPDM Manufacturers installation instructions.

EXECUTION

INSTALLATION

Roof Insulation: Mechanically fastened and adhered.

Cover Board: Mechanically fastened and adhered.

Roofing Membrane: Fully Adhered.

Seams: Adhesive, Tape, or Factory-applied seam tape.

END OF SECTION 075323

SECTION 077253 - SNOW GUARDS

0. SUMMARY

Install snow guards along lower third of Standing-Seam metal roofing system.

1. PRODUCTS

0. SNOW GUARDS

Seam-Mounted, Rail-Type Snow Guards One rail with color-matching inserts of material and finish used for metal roofing.

Provide manufacturer’s standard stainless steel or nylon-coated aluminum concealed anchor clips designed for specific roofing system and engineered to meet performance requirements, including anticipated thermal movement.

1. EXECUTION

0. INSTALLATION

Clean surfaces thoroughly prior to installation.

Prepare Surfaces using methods recommended by manufacturer for achieving acceptable results for applicable substrate under project conditions.

Install in accordance with manufacturer’s instructions, in manner that maintains roofing system weather-tight integrity.

END OF SECTION 077253

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