C04a_SOW_Specifications_1240LT26Q0125.pdf

SECTION C – SPECIFICATIONS 1 OF 19

Description/Specifications/Statement of Work

GENERAL SPECIFICATIONS

Carson District Office Roof Replacement

April, 2025

1.1 SCOPE OF CONTRACT

A. This project includes all requirement and necessary construction to replace asphalt roof shingles, self-adhering water underlayment, flashing, and necessary decking on the center part of the Carson District Office. All existing roofing materials shall be removed from the project site. Warranty of the new installation is to be included in the Project.

Demolition and Construction sequencing shall be as follows: Roof shall be stripped down to the existing roof sheathing to ensure it is in good condition. Any sheathing repair up to six 4’x8’ sheets shall be considered incidental to the lump sum roof quantity in the schedule of items. Remove and replace all existing flashings, drip edge. Remove existing shingles. Install self-adhering ice and water shield along eaves and in the valleys. Install one layer of self-adhering waterproofing underlayment applied over the entire roof section. Ensure match from new roofing and older roofing is a smooth transition. Replace shingles with architectural grade asphalt shingles as described in the specification. Replace metal drip edge, flashing, and vent covers. Preserve gutters and downspouts. Damaged gutters and appurtenances shall be replaced by the contractor at no additional cost to the government.

1.2 PROJECT LOCATION

The project is located at the Carson Ranger District of the Humboldt-Toiyabe National Forest. The District office is located at 1536 South Carson Street, Carson City, Nevada.

From Reno, NV, head South on I-580 to Carson City (for approximately 25 miles). At Exit 38/Fairview Drive, head west on Fairview Drive. Thurn North (Right) onto S Carson Street. Turn left onto West 10th Street. Take first left onto S Curry Street.

Continue for approximately ½ mile. The ranger district will be on your left.

1.3 SITE INFORMATION AND LIMITATIONS

A. The following site conditions are considered incidental to the contract and the contractor will not be paid directly for any of the following items:

1. Construction sites will be open to the public during construction. The Contractor will be responsible for signing and limiting access to the work area.

2. The office will be occupied during construction. The contractor shall take necessary precautions to keep the facility weathertight and to avoid damage to the interior of the facility.

3. Water and electricity are available at the site for construction purposes.

SECTION C – SPECIFICATIONS 2 OF 19

4. The Contractor shall provide temporary toilet facilities (porta-potty) at the site during all construction work. Placement of the port-a-potty shall be approved by the Contracting Officer and shall not take up a parking space.

1.4 TRAFFIC CONTROL AND CONSTRUCTION SIGNING

A. Coordinate all parking with the Contracting Officer. The office parking lot is fully utilized and a minimal number of parking spots for materials and trailers will be available.

B. Used construction materials shall be disposed of in an appropriate landfill or waste processing facility. The contractor shall provide and maintain appropriate waste disposal containers or bins at the project site for the duration of the project construction. Waste disposal containers shall be emptied on a weekly basis unless more frequent emptying is needed. Construction materials and debris shall not be allowed to become airborne or migrate into adjacent properties. Verify with the Contracting Office for placement of disposal containers and bins on the project site. Burning or burying of construction waste material on site will not be permitted.

1.5 WORK CAMPS, STAGING AND STORAGE AREAS

A. Areas for staging operations and storage of materials shall be approved by the CO. The Contractor must request in writing for approval from the CO to stage trailers on site.

B. No overnight camping will be allowed on site.

1.6 INSPECTION OF WORKSITE

A. The contractor acknowledges they have taken the necessary steps to ascertain the nature and location of work, and have investigated and satisfied themselves as to the general and local conditions that can affect the work or its cost. Any failure of the contractor to take the actions described and acknowledged in this paragraph will not relieve the Contractor from the responsibility of estimating properly the difficulty and cost of successfully performing the work, or for proceeding to successfully perform the work without additional expenses to the government.

1.7 CONTRACT TIME

A. Base Bid: Commence work 14 days following issuance of Notice to Proceed, work ready for use not later than 31 October 2026

1.8 SPECIFICATIONS

A. The following specifications are attached. Some sections in the schedule of items refer to other sections not listed and are subsidiary to, or are included in payment for other pay items in this contract. These items are considered incidental and no additional compensation will be made.

SECTION 013300 - SUBMITTAL PROCEDURES

SECTION 061600 - SHEATHING

SECTION 073110 - ASPHALT SHINGLES

SECTION C – SPECIFICATIONS 3 OF 19

END OF SECTION C

July 2026

SECTION C – SPECIFICATIONS 4 OF 19

USDA FOREST SERVICE, R4

Carson District Roof Replacement

SECTION 013300 - SUBMITTAL PROCEDURES

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes administrative and procedural requirements for submitting Shop Drawings, Product Data, Samples, and other miscellaneous submittals. See Table 013300-1 for a summary of required submittals.

B. See other specification section within this package for additional requirements on submittal.

1.2 SUBMITTAL PROCEDURES

A. Processing Time: Allow enough time for submittal review, including time for re-submittals, as follows. Time for review shall commence on CO's receipt of submittal.

1. Initial Review: Allow 14 days for initial review of each submittal. Allow additional time if processing must be delayed to permit coordination with subsequent submittals. CO will advise Contractor when a submittal being processed must be delayed for coordination.

2. If intermediate submittal is necessary, process it in same manner as initial submittal.

3. Allow 14 days for processing each re-submittal.

4. No extension of the Contract Time will be authorized because of failure to transmit submittals enough in advance of the Work to permit processing.

1.3 MEASUREMENT AND PAYMENT

A. No separate measurement and/or payment will be made for this section. Payment shall be included with work shown in the schedule of items.

PART 2 - PRODUCTS

2.1 ACTION SUBMITTALS – (Submittals requiring CO approval)

A. Product Data: Collect information into a single submittal for each element of construction and type of product or equipment.

1. If information must be specially prepared for submittal because standard printed data are not suitable for use, submit as Shop Drawings, not as Product Data.

2. Mark each copy of each submittal to show which products and options are applicable.

3. Include the following information for: as applicable:

a. Manufacturer's written recommendations.

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b. Manufacturer's product specifications.

c. Manufacturer's installation instructions.

d. Manufacturer's catalog cuts.

e. Wiring diagrams showing factory-installed wiring.

f. Compliance with recognized trade association standards.

g. Compliance with recognized testing agency standards.

B. Contractor's Construction Schedule: The contractor shall submit a Construction Schedule, for approval by CO, in accordance with the contract provisions within 15 day of commencement of work.

C. Samples: Prepare physical units of materials or products, including the following:

1. Samples for Initial Selection: Submit manufacturer's color charts consisting of units or sections of units showing the full range of colors, textures, and patterns available.

PART 3 - EXECUTION

SUBMITTAL SCHEDULE – Submittals shall be made as required by and called for in the drawings and specifications. The following table is a summary of the required submittals for the project - the table is to assist the Contractor and may not be all inclusive – additional submittals may be required by specific specifications:

A.

TABLE 013000-1

Spec.

Section Section Title Subse ction Required Submittal

013300 Submittal Procedures 3.1B Construction Schedule 061600 Sheathing 1.2.A Product Data 061600 Self-Adhering Underlayment 073110 Asphalt Shingles 1.3.A-

C Product Data, Maintenance Data, and Warranties

END OF SECTION 013300

July 2026

SECTION C – SPECIFICATIONS 6 OF 19

USDA FOREST SERVICE, R-4

SECTION 061600 - SHEATHING

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Roof sheathing.

2. Fasteners

3. Self Adhering Sheet Waterproofing (Ice and Water Shield)

4. Flexible flashing at openings in sheathing.

B. Related Sections include the following:

1. Division 06 Section "Rough Carpentry" for exterior plywood sheathing and interior plywood backing panels.

1.2 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 a waterborne treatment, include statement that moisture content of treated materials was reduced to levels specified before shipment to Project site.

3. Include copies of warranties from chemical treatment manufacturers for each type of treatment.

4. For waterproofing membrane, include data on air-/moisture-infiltration protection based on testing according to referenced standards.

a. Installer Qualifications: A qualified installer who is authorized, approved, of licensed by water proofing manufacturer to install manufacturer’s products.

b. Product Data: Include manufacturer's written instructions for evaluating, preparing, and treating substrate.

5. Compliance with Buy American Act

6. Product Data: For installation adhesives, indicating VOC content. Include manufacturer’s instructions written instructions for installation technical data, and tested physical and performance properties.

7. Asphalt Composition Shingles:

http://www.arcomnet.com/sustainable_design.aspx?topic=134

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a. Manufacturer’s written instructions for installations, technical data, tested physical and performance properties

b. Warranty data

c. Color Chart demonstrating match to existing roof.

8. Laboratory Test Reports: For installation adhesives, indicating compliance with requirements for low-emitting materials.

B. Research/Evaluation Reports: For the following, showing compliance with building code in effect for Project:

1. Preservative-treated plywood.

2. Waterproofing.

1.3 DELIVERY, STORAGE, AND HANDLING

A. Stack plywood and other panels flat with spacers between each bundle to provide air circulation. Provide for air circulation around stacks and under coverings.

1.4 MEASUREMENT AND PAYMENT

A. There will be no separate measurement or payment for work in this section. Payment will be included in the contract unit price for items shown in the schedule of items.

PART 2 - PRODUCTS

2.1 WOOD PANEL PRODUCTS, GENERAL

A. Plywood: Either DOC PS 1 or DOC PS 2, unless otherwise indicated.

B. Oriented Strand Board: DOC PS 2.

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

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

2.2 ROOF SHEATHING

A. Plywood Roof Sheathing: APA Rated Sheathing, Exposure 1, Exterior sheathing.

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

2. Nominal Thickness: as indicated in the structural drawings.

B. Oriented-Strand-Board Roof Sheathing: Exposure 1, Structural I sheathing.

1. Span Rating: Not less than 24/16.

2. Nominal Thickness: as indicated in the structural drawings.

3. Oriented strand board shall not be used over or within 12 inches of exposed overhangs.

2.3 FASTENERS

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

B. Power-Driven Fasteners: NES NER-272.

C. Screws for Fastening Gypsum Sheathing to Cold-Formed Metal Framing: Steel drill screws, in length recommended by sheathing manufacturer for thickness of sheathing board to be attached, with organic-polymer or other corrosion-protective coating having a salt-spray resistance of more than 800 hours according to ASTM B 117.

1. For steel framing less than 0.0329 inch thick, attach sheathing to comply with

ASTM C 1002.

2. For steel framing from 0.033 to 0.112 inch thick, attach sheathing to comply with

ASTM C 954.

2.4 PEEL AND STICK MEMBRANE

A. Self-Adhering, High-Temperature Sheet: 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. Grace Construction Products; W.R. Grace & Co. -- Conn.

b. Owens Corning.

c. Protecto Wrap Company.

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

3. Low-Temperature Flexibility: ASTM D 1970; passes after testing at minus 20 deg F or lower.

4. Waterproofness: Install self-adhering waterproof underlayment (ice and water shield) within 24” of edge of roof for full roof perimeter and to line valleys per manufacturer’s recommendations.

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.

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:

http://www.specagent.com/Lookup?ulid=5148 http://www.specagent.com/Lookup?uid=123457006067 http://www.specagent.com/Lookup?uid=123457006065 http://www.specagent.com/Lookup?uid=123457006072

SECTION C – SPECIFICATIONS 9 OF 19

1. NES NER-272 for power-driven fasteners.

2. Table 2304.9.1, "Fastening Schedule," in ICC's "International Building Code."

D. Coordinate wall and 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.

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

F. 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. E30S, "Engineered Wood Construction Guide," for types of structural-use panels and applications indicated.

B. Fastening Methods: Fasten panels as indicated below:

1. Wall and Roof Sheathing:

a. Nail to wood framing as indicated on Drawings.

b. Space panels 1/8 inch apart at edges and ends.

3.3 WEATHER-RESISTANT SHEATHING-PAPER INSTALLATION

A. General: Cover sheathing with weather-resistant sheathing paper as follows:

1. Cut back barrier 1/2 inch 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 overlap, unless otherwise indicated.

B. Building Paper: Apply horizontally with a 2-inch overlap and a 6-inch end lap; fasten to sheathing with galvanized staples or roofing nails.

C. Building Wrap: Comply with manufacturer's written instructions.

1. Seal seams, edges, fasteners, and penetrations with tape.

2. Extend into jambs of openings and seal corners with tape.

3.4 FLEXIBLE FLASHING INSTALLATION

A. Apply flexible flashing where indicated to comply with manufacturers written instructions.

1. Prime substrates as recommended by flashing manufacturer.

2. Lap seams and junctures with other materials at least 4 inches, except that at flashing flanges of other construction, laps need not exceed flange width.

SECTION C – SPECIFICATIONS 10 OF 19

3. Lap flashing over weather-resistant building paper at bottom and sides of openings.

4. Lap weather-resistant building paper over flashing at heads of openings.

5. After flashing has been applied, roll surfaces with a hard rubber or metal roller to ensure that flashing is completely adhered to substrates.

END OF SECTION 061600

FEBRUARY 2022

SECTION C – SPECIFICATIONS 11 OF 19

USDA FOREST SERVICE, R-4

SECTION 073110 - ASPHALT SHINGLES

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Asphalt shingles.

2. Self-adhering sheet underlayment.

3. Ridge vents.

B. Related Sections include the following:

1. Section 061600 "Sheathing" for roof deck.

1.2 DEFINITIONS

A. Roofing Terminology: Refer to ASTM D 1079 and glossary of NRCA's "The NRCA Roofing and Waterproofing Manual" for definitions of terms related to roofing work in this Section.

1.3 SUBMITTALS

A. Product Data: For each type of product indicated.

B. Maintenance Data: For asphalt shingles to include in maintenance manuals.

C. Warranties: Special warranties specified in this Section.

1.4 QUALITY ASSURANCE

A. Installer Qualifications: A firm or individual that is approved, authorized, or licensed by asphalt shingle roofing system manufacturer to install roofing system indicated.

B. Source Limitations: Obtain ridge and hip cap shingles through one source from a single asphalt shingle manufacturer.

C. Fire-Test-Response Characteristics: Provide asphalt shingle and related roofing materials with the fire-test-response characteristics indicated, as determined by testing identical products per test method below by UL or another testing and inspecting agency acceptable to authorities having jurisdiction. Identify materials with appropriate markings of applicable testing and inspecting agency.

1. Exterior Fire-Test Exposure: Class A; ASTM E 108 or UL 790, for application and roof slopes indicated.

1.5 DELIVERY, STORAGE, AND HANDLING

SECTION C – SPECIFICATIONS 12 OF 19

A. Store roofing materials in a dry, well-ventilated, weathertight location according to asphalt shingle manufacturer's written instructions. Store underlayment rolls on end on pallets or other raised surfaces. Do not double-stack rolls.

1. Handle, store, and place roofing materials in a manner to avoid significant or permanent damage to roof deck or structural supporting members.

B. Protect unused underlayment from weather, sunlight, and moisture when left overnight or when roofing work is not in progress.

1.6 PROJECT CONDITIONS

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

1. Install self-adhering sheet underlayment within the range of ambient and substrate temperatures recommended by manufacturer.

1.7 WARRANTY

A. Special Warranty: Manufacturer's standard form in which manufacturer agrees to repair or replace asphalt shingles that fail in materials within specified warranty period.

Materials failures include manufacturing defects and failure of asphalt shingles to self-seal after a reasonable time.

1. Material Warranty Period: 25 years from date of Substantial Completion, prorated, with first 3 years non-prorated.

2. Wind-Speed Warranty Period: Asphalt shingles will resist blow-off or damage caused by wind speeds up to 80 mph for 5 years from date of Substantial Completion.

3. Workmanship Warranty Period: 10 years from date of Substantial Completion.

B. Special Project Warranty: Roofing Installer's warranty, on warranty form at end of this Section, signed by roofing Installer, covering Work of this Section, in which roofing Installer agrees to repair or replace components of asphalt shingle roofing that fail in materials or workmanship within the following warranty period:

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

1.8 MEASUREMENT AND PAYMENT

A. There will be no separate measurement or payment for work in this section. Payment will be included at the contract unit price as shown on the Schedule of Items for the building.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

SECTION C – SPECIFICATIONS 13 OF 19

A. In other Part 2 articles where titles below introduce lists, the following requirements apply to product selection:

1. Available Products: Subject to compliance with requirements, products that may be incorporated into the Work include, but are not limited to, products specified.

2.2 GLASS-FIBER-REINFORCED ASPHALT SHINGLES

A. Laminated-Strip Asphalt Shingles: ASTM D 3462, laminated, multi-ply overlay construction, glass-fiber reinforced, mineral-granule surfaced, and self-sealing.

1. Available Products include, but are not limited to:

a. CertainTeed Corporation; Landmark TL

b. GAF Materials Corporation; Timberline HDZ

c. Owens Corning; Duration Designer

d. TAMKO Roofing Products, Inc.; Titan XT

2. Butt Edge: Straight cut.

3. Strip Size: Manufacturer's standard.

4. Color and Blends: As indicated by manufacturer's designations.

B. Hip and Ridge Shingles: Manufacturer's standard units to match asphalt shingles.

2.3 UNDERLAYMENT MATERIALS

A. Self-Adhering Sheet Underlayment, Polyethylene Faced: ASTM D 1970, minimum of 40-mil- thick, slip-resisting, polyethylene-film-reinforced top surface laminated to SBS-modified asphalt adhesive, with release paper backing; cold applied, for installation on roof slopes of 5 in 12 maximum..

1. Available Products:

a. Carlisle Coatings & Waterproofing, Div. of Carlisle Companies Inc.; Dri- Start "A."

b. Grace, W. R. & Co.; Grace Ice and Water Shield.

c. Henry Company; Perma-Seal PE.

d. Johns Manville International, Inc.; Roof Defender.

e. NEI Advanced Composite Technology; AC Poly Ice and StormSeal.

f. Owens Corning; WeatherLock M.

g. Polyguard Products, Inc.; Polyguard Deck Guard.

h. Protecto Wrap Company; Rainproof TM.

i. SafSeal Innovations; SafSeal 7740.

2.4 RIDGE VENTS

A. Rigid Ridge Vent: Manufacturer's standard rigid section high-density polypropylene or other UV-stabilized plastic ridge vent with nonwoven geotextile filter strips and with external deflector baffles; for use under ridge shingles.

1. Available Products:

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a. Air Vent Inc., a CertainTeed Company; ShingleVent II.

b. GAF Materials Corporation; Cobra Rigid Vent II.

c. Lomanco, Inc.; OR-4.

d. Mid-America Building Products; RidgeMaster Plus.

e. Obdyke, Benjamin Incorporated; Xtractor Vent X18.

f. Owens Corning; VentSure Ridge Vent.

g. Solar Group, Inc. (The), a Gibraltar Company; PRV4.

2.5 ACCESSORIES

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

B. Roofing Nails: ASTM F 1667; aluminum, stainless-steel, copper, or hot-dip galvanized steel wire shingle nails, minimum 0.120-inch- diameter, smooth shank, sharp-pointed, with a minimum 3/8-inch- diameter flat head and of sufficient length to penetrate 3/4 inch into solid wood decking or extend at least 1/8 inch through OSB or plywood sheathing.

1. Where nails are in contact with metal flashing, use nails made from same metal as flashing.

2.6 METAL FLASHING AND TRIM

A. Sheet Metal Flashing and Trim: Comply with requirements in Section 07620"Sheet Metal Flashing and Trim."

1. Sheet Metal: Coil-coated aluminum or Zinc-coated (galvanized) steel.

B. Fabricate sheet metal flashing and trim to comply with recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions, metal, and other characteristics of item.

1. Flashings: Fabricate with concealed flange extending a minimum of 18 inches beneath upslope asphalt shingles and 6 inches above the roof plane.

2. Open Valley Flashings: Fabricate in lengths not exceeding 10 feet with 1-inch-high inverted-V profile at center of valley and equal flange widths of 18 inches.

3. Drip Edges: Fabricate in lengths not exceeding 10 feet with 6-inch roof deck flange and 1-1/2-inch fascia flange with 1/2-inch drip at lower edge unless full metal fascia is required.

C. Vent Pipe Flashings: ASTM B 749, Type L51121, at least 1/16 inch thick. Provide lead sleeve sized to slip over and turn down into pipe, soldered to skirt at slope of roof and extending at least 4 inches from pipe onto roof.

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 work.

SECTION C – SPECIFICATIONS 15 OF 19

1. Examine roof sheathing to verify that sheathing joints are supported by framing and blocking or metal clips and that installation is within flatness tolerances.

2. Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and completely anchored; and that provision has been made for flashings and penetrations through asphalt shingles.

3. For the record, prepare written report, endorsed by Installer, listing conditions detrimental to performance of work.

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

3.2 UNDERLAYMENT INSTALLATION

A. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle free, on roof deck. Comply with low-temperature installation restrictions of underlayment manufacturer if applicable. Install at locations indicated below, lapped in direction to shed water. Lap sides not less than 3-1/2 inches . Lap ends not less than 6 inches staggered 24 inches between courses. Roll laps with roller. Cover underlayment within seven days.

1. Eaves: Extend from edges of eaves 72 inches beyond interior face of exterior wall.

2. Rakes: Extend from edges of rake 36 inches beyond interior face of exterior wall.

3. Valleys: Extend from lowest to highest point 36 inches on each side.

4. Hips: Extend 36 inches on each side.

5. Ridges: Extend 36 inches on each side without obstructing continuous ridge vent slot.

6. Sidewalls: Extend beyond sidewall 36 inches and return vertically against sidewall not less than 18 inches

7. Dormers, Chimneys, Skylights, and other Roof-Penetrating Elements: Extend beyond penetrating element 18 inches and return vertically against penetrating element not less than 12 inches

8. Roof Slope Transitions: Extend 36 inches on each roof slope.

B. Metal-Flashed Open Valley Underlayment: Install two layers of 36-inch- wide felt underlayment centered in valley. Stagger end laps between layers at least 72 inches. Lap ends of each layer at least 12 inches in direction to shed water, and seal with asphalt roofing cement. Fasten each layer to roof deck with roofing nails.

1. Lap roof deck felt underlayment over first layer of valley felt underlayment at least 6 inches .

3.3 METAL FLASHING INSTALLATION

A. General: Install metal flashings and other sheet metal to comply with requirements in Section 07620 "Sheet Metal Flashing and Trim."

1. Install metal flashings according to recommendations in ARMA's "Residential Asphalt Roofing Manual" and asphalt shingle recommendations in NRCA's "The NRCA Roofing and Waterproofing Manual."

SECTION C – SPECIFICATIONS 16 OF 19

B. Flashings: Install against the roof-penetrating element extending concealed flange beneath upslope asphalt shingles and beyond each side.

C. Open Valley Flashings: Install centrally in valleys, lapping ends at least 8 inches in direction to shed water. Fasten upper end of each length to roof deck beneath overlap.

1. Secure hemmed flange edges into metal cleats spaced 12 inches apart and fastened to roof deck.

2. Adhere 9-inch- wide strip of self-adhering sheet to metal flanges and to self-adhering sheet underlayment.

D. Rake Drip Edges: Install rake drip edge flashings over underlayment and fasten to roof deck.

E. Eave Drip Edges: Install eave drip edge flashings below underlayment and fasten to roof sheathing.

F. Pipe Flashings: Form flashing around pipe penetrations and asphalt shingles. Fasten and seal to asphalt shingles as recommended by manufacturer.

3.4 ASPHALT SHINGLE INSTALLATION

A. Install asphalt shingles according to manufacturer's written instructions, recommendations in ARMA's "Residential Asphalt Roofing Manual," and asphalt shingle recommendations in NRCA's "The NRCA Roofing and Waterproofing Manual."

B. Install starter strip along lowest roof edge, consisting of an asphalt shingle strip at least 7 inches wide with self-sealing strip face up at roof edge.

1. Extend asphalt shingles 3/4 inch over fascia at eaves and rakes.

2. Install starter strip along rake edge.

C. Install first and remaining courses of asphalt shingles stair-stepping diagonally across roof deck with 5-inch manufacturer's recommended offset pattern at succeeding courses, maintaining uniform exposure.

D. Install first and remaining courses of asphalt shingles stair-stepping diagonally across roof deck with manufacturer's recommended offset pattern at succeeding courses, maintaining uniform exposure.

E. Install asphalt shingles by single-strip column or racking method, maintaining uniform exposure. Install full length first course followed by cut second course, repeating alternating pattern in succeeding courses.

F. Fasten asphalt shingle strips with a minimum of five roofing nails located according to manufacturer's written instructions.

1. Where roof slope exceeds 20:12, seal asphalt shingles with asphalt roofing cement spots after fastening with additional roofing nails.

2. Where roof slope is less than 4:12, seal asphalt shingles with asphalt roofing cement spots.

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3. When ambient temperature during installation is below 50 deg F seal asphalt shingles with asphalt roofing cement spots.

G. Open Valleys: Cut and fit asphalt shingles at open valleys, trimming upper concealed corners of shingle strips. Maintain uniform width of exposed open valley from highest to lowest point.

1. Set valley edge of asphalt shingles in a 3-inch- wide bed of asphalt roofing cement.

2. Do not nail asphalt shingles to metal open valley flashings.

H. Ridge Vents: Install continuous ridge vents over asphalt shingles according to manufacturer's written instructions. Fasten with roofing nails of sufficient length to penetrate sheathing.

I. Ridge Cap Shingles: Maintain same exposure of cap shingles as roofing shingle exposure. Lap cap shingles at ridges to shed water away from direction of prevailing winds. Fasten with roofing nails of sufficient length to penetrate sheathing.

1. Fasten ridge cap asphalt shingles to cover ridge vent without obstructing airflow.

3.5 ROOFING INSTALLER'S WARRANTY: Contractor to fill in the missing information below.

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: USDA Forest Service, Humboldt-Toiyabe National Forest

2. Address: 1536 South Carson Street, Carson City, Nevada.

3. Acceptance Date: < .>

4. Warranty Period: < .>

5. Expiration 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, C. NOW THEREFORE Roofing Installer hereby warrants, subject to terms and conditions herein set forth, that during Warranty Period he will, at his 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 90 mph;

c. fire;

SECTION C – SPECIFICATIONS 18 OF 19

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

e. faulty construction of parapet walls, copings, 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, 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.

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.>

SECTION C – SPECIFICATIONS 19 OF 19

END OF SECTION 073110

FEBRUARY 2022