A06_NIFC_102-SHP_Roof_Replacement_SPECS_21DEC2023.pdf

NIFC 102-SHOSHONE-PAIUTE (SHP) 07DEC2023

Roof Replacement

GENERAL

1.1 SUMMARY

A. This project is for the removal and replacement of the roof system as defined on the attached drawing, on building 102-Shoshone-Paiute (102-SHP). This building is located at 2362 W. Robinson Rd. on the National Interagency Fire Center (NIFC) campus in Boise, Idaho.

B. Known Conditions:

1. The building was built in 2009 using prefabricated modular sections.

2. The existing roof is 45 MIL fully adhered black EPDM with 1/4” DensDeck over

1/2” plywood decking. There is L-Metal over trim extended below J-Rail for gutter installation. EPDM is fastened to Mansard with J-Rail.

3. There are six roof mounted air handling units that will remain in place and require curb flashing. There are 3 condensing air units that will need to be disconnected by qualified contractor to replace roof.

4. The building has an existing gas pipeline system that is routed on roof on blocks that extends to roof top units.

5. The existing roof has no parapet.

6. Gutters are installed on both north and south sides of the roof’s edge and span the length of the building.

7. The pitch of the roof is 1/4:12 inch.

8. The existing R-30 insulation located below the roof deck between the joist cavities will remain in place.

C. Contractor shall have limited use of premises for construction operations as defined by the Contracting Officers Representative (COR).

D. GOVERNMENT OCCUPANCY: NIFC is a fully occupied and operational campus.

The Government will occupy 102-SHP building during the project.

E. SAFETY: NIFC is a fully occupied and operational campus. Contractor shall provide traffic ways, erect barriers, fences, guards, rails, and enclosures as necessary to protect personnel, roofs and structures, vehicles and utilities. Contractor is responsible for providing appropriate safety equipment for contractor personnel use.

F. SUMMARY: Work consists of the following:

1. Remove existing EPDM roofing system.

2. Install 2 ply Styrene Butadiene Styrene (SBS) Modified Bituminous Membrane roofing system.

3. Flash roof curbs, equipment supports, plumbing vents, and all other roof penetrating items.

4. Provide new wood blocking, nailers, and cant strips per these specifications.

5. Install new roof walking pads per drawing.

6. Install new roof pads for gas line supports and condensers per drawing.

1.2 REFERENCES

A. ASTM D 451 – Standard Test Method for Sieve Analysis of Granular Mineral Surfacing for Asphalt Roofing Products.

B. ASTM D 2822 Standard Specification for Asphalt Roof Cement.

C. ASTM D 6162 Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using a Combination of Polyester and Glass Fiber Reinforcements.

D. ASTM D 6163 Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using Glass Fiber Reinforcements.

E. ASTM D 6164 Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using Polyester Reinforcements.

F. ASTM E 108 Standard Test Methods for Fire Test of Roof Coverings.

G. National Roofing Contractors Association (NRCA): Roofing and Waterproofing Manual.

H. Sheet Metal and Air Conditioning Contractor National Association, Inc. (SMACNA):

Architectural Sheet Metal Manual.

I. Underwriters Laboratories, Inc. (UL): Fire Hazard Classifications.

J. Warnock Hersey (WH): Fire Hazard Classifications.

K. ASCE 7-05 Minimum Design Loads for Building and Other Structures.

L. UL Fire Resistance Directory.

1.3 SUBMITTALS

A. Contractor shall submit work schedule, safety plan, product data, samples, and calculations, in a complete package, to the Government for review. Allow 14 calendar days for review of each submittal.

B. Use for construction: Use only final submittals indicating “APPROVED” or “REVIEWED” marked by Government.

C. Product Data: Manufacturer’s data sheets on each product to be used, including

1. Preparation instructions and recommendations.

2. Storage and handling requirements and recommendations.

3. Installation instructions.

4. Manufacturer’s Certificates certifying products meet or exceed specified requirements.

D. Shop drawings: Contractor shall submit shop drawings including installation details of roofing, flashing, fastening, and vapor barrier, including notation of roof slopes and fastening patterns of base modified bitumen membrane.

E. Design Pressure Calculations: Contractor shall submit design pressure calculations for the roof area in accordance with ASCE 7-05 and local Building Code requirements.

Include a roof system attachment analysis report, certifying the system’s compliance with applicable wind load requirements.

F. Recycled or Bio-Based Materials: Contractor shall submit third party certifications through UL Environment of Roof System membranes containing recycled or bio based materials.

G. Verification Samples: Contractor shall submit two samples, 6 inch square, for each modified bituminous membrane ply product specified. Samples shall represent actual product, color, and patterns.

H. Closeout Submittals: Contractor shall provide manufacturer’s maintenance instructions that include recommendations for periodic inspection and maintenance of all completed roofing work. Provide product warranty executed by the manufacturer. Contractor shall assist Government in preparation and submittal of roof installation acceptance certification.

1.4 QUALITY ASSURANCE

A. Contractor shall perform work in accordance with the National Roofing Contractors Association (NRCA) Roofing and Waterproofing Manual.

B. Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacture’s limits.

C. Roofing manufacturer shall be a company specializing in manufacturing products specified in this specification with documented ISO 9001 certification and previous experience.

D. Roofing installer shall be a company specializing in roof installation work identified in this specification.

E. Roofing installer shall maintain a full-time supervisor/foreman on the job site during all phases of roofing work.

F. Provide manufacturer’s certification that materials are manufactured in the United States and conform to requirements specified and are chemically and physically compatible with each other and are suitable for inclusion in the total roof system defined.

G. All components of the roof system shall be obtained from a single manufacturer.

Secondary products that are required shall be as recommended and approved in writing by the roofing system manufacturer. Submit manufacturer’s written approval of secondary components in list form, signed by authorized agent of the manufacturer, to the Government.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Deliver and store products in manufacturer’s unopened packaging with labels intact until ready of installation.

B. Store all roofing materials in a dry place, on pallets or raised platforms, out of direct exposure to the elements until time of application. Store materials at least 4 inches above ground level and covered with “breathable” tarpaulins.

C. Store in accordance with the instructions of the manufacturer. Store rolled goods on end on a clean flat surface. Wet or damaged material shall not be used.

D. Store rolled goods at room temperature wherever possible. During winter store materials in a heated location with a 50 degree F. minimum temperature. Keep materials away from open flame or welding sparks.

E. Stockpiling of materials on the roof will not be allowed.

F. Store adhesives between 40℉. and 80℉ in a flammable storage cabinet.

1.6 PRE-INSTALLATION MEETING

A. Coordinate and set-up a pre-installation meeting with the Government a minimum of two weeks prior to beginning roof replacement work.

B. Contractor shall review installation procedures and coordination required with related work.

C. Contractor shall inspect and make notes of project conditions.

1. Identify all outstanding issues in meeting minutes and designate the responsible party for follow-up action and a timetable for completion.

2. Record minutes of this meeting and provide copies to all parties present.

3. Installation of roofing system shall not begin until all outstanding issues are resolved to the satisfaction of the Government.

1.7 WARRANTY

A. Contractor shall provide manufacturer’s written and signed No Dollar Limit (NDL) Warranty, warranting that, if a leak develops in the roof during the term of this warranty, due to defective material or defective workmanship by the installing contractor, the manufacturer shall provide the Government, at the Manufacturers expense, with the labor and the material necessary to return the defective area to a watertight condition.

1. Warranty Period shall be 20 years from date of acceptance. Warranty requires mid-period inspection.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Energy Performance: Initial Solar Reflectance not less than 0.70 and Thermal Emittance not less than 0.75 when tested according to Cool Roof Rating Council, CRRC-1.

B. Solar Reflectance Index: Not less than 78 when calculated according to ASTM E 1980.

C. Wind-Uplift Resistance of Roof Assemblies: UL580, Class 60.

D. Exterior Fire-Test Exposure: ASTM E 108, Class A.

2.2 ROOFING MATERIALS – BITUMEN ROOF

A. Base (Ply) Sheet: 80 mil, ASTM D 4601, Type II SBS-modified, asphalt-impregnated and coated, dual glass-fiber-reinforced scrim. Retain option in “Manufacturers” Subparagraph below to limit manufacturers to those listed.

B. Modified Cap (Ply) Sheet: 160 mil, ASTM D 6162, Grade G, Type II, SBS and SIS mineral surfaced rubber modified roofing membrane, with fire retardant characteristics and reinforced with a combination of polyester scrim and glass fiber scrim.

C. InterPly Adhesive: Cold Applied Solvent Free Membrane Adhesive with zero VOC, non-volatile content 100%, 11.4 lbs/gal density.

D. Flashing Base Ply: 80 mil, ASTM D 4601, Type II, SBS-modified, asphalt-impregnated and coated, dual glass-fiber sheet.

E. Flashing Cap Sheet: 160 mil, ASTM D 6162, Grade G, Type II, SBS and SIS mineral surfaced rubber modified roofing membrane, with fire retardant characteristics and reinforced with a combination of polyester scrim and glass fiber scrim.

F. Flashing Ply Adhesive: Cold Applied Solvent Free Membrane Adhesive with zero VOC, non-volatile content 100%, 11.4 lbs/gal density.

G. Surface Coating: White elastomeric roof coating, Energy Star approved, ASTM G 26.

H. Flashing and Trim: Provide matching roof trim and fasteners.

I. Recover Board: 1/2“ minimum thickness, ASTM C 208, Type II, Grade 1 and 2 and UL Std 790 used with Modified Bitumen roof system.

2.3 ACCESSORIES-BITUMEN ROOF

A. Roof Insulation: Provide Georgia Pacific Gypsum DensDeck Prime, Georgia Pacific DensDeck DuraGuard, or USG Securrock for proper adhesion of the self-adhered base sheet, shall be ASTM C 1177/C 1177M, 1/2 inch thick.

B. Walking Paths: Walkways shall be per roof manufacturer’s recommendations and shall be compatible with specified roofing system.

2.4 EDGE TREATMENT AND ROOF PENETRATION FLASHINGS-BITUMEN ROOF

A. Flashing Boot: Neoprene pipe boot for sealing single or multiple pipe penetrations adhered in approved adhesives as recommended and furnished by the membrane manufacturer.

B. Vents and Breathers: Heavy gauge aluminum and fully insulated vent that allows moisture and air to escape buy not enter the roof system as recommended and furnished by the membrane manufacturer.

C. Pitch pans, Rain Collar: 24 gauge stainless steel or 20oz copper. All joints should be welded/soldered watertight.

D. Plumbing stacks and drain flashings shall be 4lb sheet lead formed and rolled.

E. Liquid Flashing: Asphaltic-polyurethane, low odor, liquid flashing material designed for specialized details unable to be waterproofed with typical modified membrane flashings, ASTM D 412.

F. Roof Specialties: Manufactured copings, fascia, gravel stops, control joints, expansion joints, joint covers and related flashings and trim shall conform to SMACNA and/or NRCA as applicable.

PART 3 - EXECUTION

3.1 DEMOLITION

A. Remove and properly dispose of existing roofing material. Provide waste and recycle tickets to COR.

B. Leave enough old EPDM to seam together with new bitumen roof on the rooftop unit curbing.

C. Leave existing roof deck on roof, unless noticeable problem areas are found. Notify the

COR.

3.2 EXAMINATION

A. Do not begin installation until substrates have been properly prepared.

B. Inspect and approve the deck condition, slopes and fastener backing if applicable, expansion joints, roof drains, stack vents, vent outlets, nailers and surfaces and elements.

C. Verify that work penetrating the roof deck, or which may otherwise affect the roofing, has been properly completed.

3.3 PREPARATION

A. General: Clean surfaces thoroughly prior to installation.

B. Construct sloped roof deck from insulation. Minimum slope shall be 2% or as required by bitumen roofing manufacturer, whichever is greater.

C. Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.

D. Fill substrate surface voids that are greater than 1/4 inch wide with an acceptable fill material.

E. Roof surface to receive roofing system shall be smooth, clean, free from loose gravel, dirt and debris, dry and structurally sound.

F. Wherever necessary, all surfaces to receive roofing materials shall be power broomed and vacuumed to remove debris and loose matter prior to starting work.

G. Do not apply roofing during inclement weather. Do not apply roofing membrane to damp, frozen, dirty, or dusty surfaces.

H. Fasteners and plates for fastening components mechanically to the substrate shall provide a minimum pull-out capacity of 300 lbs. (136 k) per fastener. Base or ply sheets attached with cap nails require a minimum pullout capacity of 40 lb. per nail.

I. Prime decks where required, in accordance with requirements and recommendations of the primer and deck manufacturer.

3.4 INSTALLATION – BITUMEN ROOF

A. GENERAL

1. Install modified bitumen membranes and flashings in accordance with manufacturer's instructions and with the recommendations provided by the National Roofing Contractors Association's Roofing & Waterproofing Manual, the Asphalt Roofing Manufacturers Association, and applicable codes.

2. Avoid installation of modified bitumen membranes at temperatures lower than 40- 45 degrees F. When work at such temperatures unavoidable use the following precautions:

a. Take extra care during cold weather installation and when ambient temperatures are affected by wind or humidity, to ensure adequate bonding is achieved between the surfaces to be joined. Use extra care at material seam welds and where adhesion of the applied product to the appropriately prepared substrate as the substrate can be affected by such temperature constraints as well.

b. Unrolling of cold materials, under low ambient conditions must be avoided to prevent the likelihood of unnecessary stress cracking. Rolls must be at least 40 degrees F at the time of application. If the membrane roll becomes stiff or difficult to install, it must be replaced with roll from a heated storage area.

3. Begin installation of the roofing system at the lowest point of the roof (or roof area), working up the slope toward the highest point. Lap sheets shingle fashion so as to constantly shed water.

3.5 INSTALLATION-BITUMEN ROOF

A. Base Ply: Cut base ply sheets into 18-foot lengths and allow plys to relax before installing. Install base sheet in interply adhesive applied at the rate required by the manufacturer. Shingle base sheets uniformly to achieve one ply throughout over the prepared substrate. Shingle in proper direction to shed water on each large area of roofing.

1. Lap ply sheet ends 8 inches. Stagger end laps 12 inches minimum.

2. Solidly bond to the substrate and adjacent ply with specified cold adhesive at the rate of 2 to 2-1/2 gallons per 100 square feet.

3. Roll must push a puddle of adhesive in front of it with adhesive slightly visible at all side laps. Use care to eliminate air entrapment under the membrane.

4. Install subsequent rolls of modified across the roof as above with a minimum of 4 inch side laps and 8 inch staggered end laps. Lay modified membrane in the same direction as the underlayers but the laps shall not coincide with the laps of the base layers.

5. Extend plies 2 inches beyond top edges of cants at wall and projection bases.

6. Install base flashing ply to all perimeter and projection details.

7. Allow the one ply of base sheet to cure at least 30 minutes before installing the modified membrane. However, the modified membrane must be installed the same day as the base plies.

B. Modified Cap Ply(s): Cut cap ply sheets into 18 foot lengths (or as appropriate for size of roof) and allow plys to relax before installing. Install in interplay adhesive applied at the rate required by the manufacturer. Shingle sheets uniformly over the prepared substrate to achieve the number of plys specified. Shingle in proper direction to shed water on each large area of roofing.

1. Lap ply sheet ends 8 inches. Stagger end laps 12 inches minimum.

2. Solidly bond to the base layers with specified cold adhesive at the rate of 2 to 2-

1/2 gallons per 100 square feet.

3. Roll must push a puddle of adhesive in front of it with adhesive slightly visible at all side laps. Care should be taken to eliminate air entrapment under the membrane.

4. Install subsequent rolls of modified across the roof as above with a minimum of 4 inch side laps and 8 inch staggered end laps. Lay modified membrane in the same direction as the underlayers but the laps shall not coincide with the laps of the base layers.

5. Allow cold adhesive to set for 5 to 10 minutes before installing the top layer of modified membrane.

6. Extend membrane 2 inches beyond top edge of all cants in full moppings of the cold adhesive as shown on the Drawings.

C. Fibrous Cant Strips: Provide non-combustible perlite or glass fiber cant strips at all wall/curb detail treatments where angle changes are greater than 45 degrees. Cant may be set in approved cold adhesives, hot asphalt or mechanically attached with approved plates and fasteners.

D. Wood Blocking, Nailers and Cant Strips:

1. Provide nailers at all roof perimeters and penetrations for fastening membrane flashings and sheet metal components.

2. Wood nailers should match the height of any insulation, providing a smooth and even transition between flashing and insulation areas.

3. Nailer lengths should be spaced with a minimum 1/8 inch gap for expansion and contraction between each length or change of direction.

4. Nailers and flashings should be fastened in accordance with Factory Mutual "Loss

Prevention Data Sheet 1- 49, Perimeter Flashing" and be designed to be capable of resisting a minimum force of 200 lbs/lineal foot in any direction.

E. Metal Work: Provide metal flashings, counter flashings, and thru-wall flashings as required. Install in accordance with the SMACNA "Architectural Sheet Metal Manual" or the NRCA Roofing Waterproofing manual.

F. Termination Bar: Provide a metal termination bar or approved top edge securement at the terminus of all flashing sheets at walls and curbs. Fasten the bar a minimum of 8 inches on center to achieve constant compression. Provide suitable, sealant at the top edge as required.

G. Flashing Base Ply: Install flashing sheets by the same application method used for the base ply.

1. Seal curb, wall and parapet flashings with an application of mastic and mesh on a daily basis. Do not permit conditions to exist that will allow moisture to enter behind, around or under the roof or flashing membrane.

2. Prepare all walls, penetrations, and expansion joints to be flashed with required primer at the rate of 100 square feet per gallon. Allow primer to dry tack free.

3. Adhere to the underlying base ply with specified flashing ply adhesive unless otherwise specified. Nail off at a minimum of 8 inches on center. from the finished roof at all vertical surfaces.

4. Solidly adhere the entire flashing ply to the substrate. Secure the tops of all flashings that are not run up and over curb through termination bar fastened at 6 inches on center and sealed at top.

5. Seal all vertical laps of flashing ply with a three-course application of trowel-grade mastic and fiberglass mesh.

6. Coordinate counter flashing, cap flashings, expansion joints and similar work with modified bitumen roofing work as specified.

7. Coordinate roof accessories, miscellaneous sheet metal accessory items, including piping vents and other devices with the roofing system work.

8. Secure the top edge of the flashing sheet using a termination bar only when the wall surface above is waterproofed or nailed 4 inches on center and covered with an acceptable counter flashing.

H. Flashing Cap Ply: Install flashing cap sheets by the same application method used for the base ply.

1. Seal curb flashings with an application of mastic and mesh on a daily basis. Do not permit conditions to exist that will allow moisture to enter behind, around or under the roof or flashing membrane.

2. Prepare all walls, penetrations, expansion joints and where shown on the Drawings to be flashed with required primer at the rate of 100 square feet per gallon. Allow primer to dry tack free.

3. Adhere to the underlying base flashing ply with specified flashing ply adhesive unless otherwise specified. Nail off at a minimum of 8 inches on center from the finished roof at all vertical surfaces.

4. Coordinate counter flashing, cap flashings, expansion joints and similar work with modified bitumen roofing work as specified.

5. Coordinate roof accessories, miscellaneous sheet metal accessory items with the roofing system work.

6. All stripping shall be installed prior to flashing cap sheet installation.

7. Heat and scrape granules when welding or adhering at cut areas and seams to granular surfaces at all flashings.

8. Secure the top edge of the flashing sheet using a termination bar only when the wall surface above is waterproofed or nailed 4 inches on center and covered with an acceptable counter flashing. Replacement: Secure the top edge of flashing sheet over the edge of the mansard with L shaped flashing.

I. Surface Coatings: Apply roof coatings in strict conformance with the manufacturer's recommended procedures.

J. Roof Walkways: Provide walkway pads in areas indicated on the Drawings. Adhere to roofing with compatible adhesive.

3.6 INSTALLATION EDGE TREATMENT AND ROOF PENETRATION FLASHING-

BITUMEN ROOF

A. Surface Mounted Counterflashing:

1. Minimum flashing height is 8 inches above finished roof height. Maximum flashing height is 24 inches. Prime vertical wall at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all field plies over cant a minimum of 2 inches.

3. Install base flashing ply covering wall set in bitumen with 6 inches on to field of the roof.

4. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches on to the field of the roof. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

5. Apply butyl tape to wall behind flashing. Secure termination bar through flashing, butyl tape and into wall. Alternatively use caulk to replace the butyl tape.

6. Secure counterflashing set on butyl tape above flashing at 8 inches on center and caulk top of counterflashing.

B. Equipment Support:

1. Prime vertical at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all field plies over cant a minimum of 2 inches.

3. Install base flashing ply covering curb set in bitumen with 6 inches on to field of the roof.

4. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches on to the field of the roof. Attach top of membrane to top of curb and nail at 8 inches on center. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

5. Install pre-manufactured cover. Fasten sides at 24 inches on center with fasteners and neoprene washers. Furnish all joint cover laps with butyl tape between metal covers.

6. Set equipment on neoprene pad and fasten as required by equipment manufacturer.

C. Curb Detail for Air Handlers:

1. The existing air handling units shall remain in place, contractor shall provide new roofing and flash as required.

2. Prime vertical at a rate of 100 square feet per gallon and allow to dry.

3. Set cant in bitumen. Run all field plies over cant a minimum of 2 inches.

4. Install base flashing ply covering curb set in bitumen with 6 inches on to field of the roof.

5. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches on to the field of the roof. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

6. Install pre-manufactured counterflashing with fasteners and neoprene washers or per manufacturer's recommendations.

D. Condensing Units:

1. Condensing units shall be disconnected by a qualified contractor in order to replace the roof system.

2. One condensing unit on roof is on stanchions and shall be temporarily moved to provide new bitumen roof, flashing, and new neoprene pad as required.

3. Two condensing units are bolted to cement pads and shall be temporarily moved to provide new bitumen roof, flashing, and new neoprene pad as required.

E. Gas Line:

1. Contractor shall provide temporary support to gas line, which extends the entire length of the roof, as the roof is replaced. New neoprene pads shall be installed under blocks that support the gas line.

F. Gutter Installation:

1. Re-attach existing rain gutters to both north and south sides of roof and seal the edge watertight.

3.7 PROTECTION

A. Provide traffic ways, erect barriers, fences, guards, rails, enclosures, chutes and the like to protect personnel, roofs and structures, vehicles and utilities.

B. Protect exposed surfaces of finished walls with tarps to prevent damage.

C. Plywood for traffic ways required for material movement over existing roofs shall be not less than 5/8 inch (16 mm) thick.

D. In addition to the plywood listed above, an underlayment of minimum 1/2 inch (13 mm) recover board is required on new roofing.

E. Special permission shall be obtained from the Manufacturer before any traffic shall be permitted over new roofing.

3.8 FIELD QUALITY CONTROL

A. Inspection: Provide manufacturer's field observations a minimum of 3 days per week while project is ongoing.

1. Warranty shall be issued upon manufacturer's acceptance of the installation.

2. Field observations shall be performed by a Technical Representative employed full-time by the manufacturer and whose primary job description is to assist, inspect and approve membrane installations for the manufacturer.

3. Provide observation reports from the Technical Representative indicating procedures followed, weather conditions and any discrepancies found during inspection.

4. Provide a final report from the Technical Representative, certifying that the roofing system has been satisfactorily installed according to the project specifications, approved details and good general roofing practice.

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