NIFC_120-INT_Roof_Replace_-_SPECS.pdf

NIFC 120 Inflation Tower October 2021 Roof Replacement

PART 1 - GENERAL

1.1 GENERAL INFORMATION

A. This project is for the removal and replacement both sections of the roof on building 120 Inflation Tower (INT). This building is located at 3803 S. Development Ave. on the National Interagency Fire Center (NIFC) campus in Boise, Idaho.

B. Known Conditions

1. The existing flat roof is EPDM over plywood decking with rigid insulation.

2. The flat roof area surrounds a large dome, that takes up a large portion of the building roof area, which is not part of the roof replacement.

3. The existing roof is flat with no parapet.

4. The building has an existing lightning arrest system with roof penetrations.

5. The north side of the building has a lower sloped metal roof with no insulation.

6. Building area protected by the sloped metal roof contains hydrogen gas cylinders, for the purpose of filling large weather balloons, cylinders will be removed before roof replacement by Government.

C. Work shall be performed during regular working hours, Monday through Friday between 7:00 AM and 4:30 PM.

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

E. GOVERNMENT OCCUPANCY: NIFC is a fully occupied and operational campus. The 120- INT building will be used during the project, as coordinated with the contractor. Contractor shall keep power connected to the building.

F. SAFETY: NIFC is a fully occupied and operations campus; the contractor shall provide all required barriers for protection of personnel around all work areas. Contractor shall provide equipment required for work at roof level.

G. SUMMARY: Work consists of the following:

1. Remove existing EPDM roofing system and replace with a new modified Bitumen roof system.

2. Remove existing sloped metal roof and replace with new metal roofing system.

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, product data, samples, and calculations, in a complete package, to the Government for review. A single, complete package shall be submitted a minimum of 2 weeks prior to scheduled work start date.

B. 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.

C. Shop drawings: Contractor shall submit shop drawings including installation details of roofing, flashing, fastening, insulation and vapor barrier, including notation of roof slopes and fastening patterns of insulation and roofing materials.

D. 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. Report shall be signed and sealed by a Professional Engineer who has previously provided roof system attachment analysis.

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

F. Verification Samples: Contractor shall submit a total of four samples, 6-inch square each, for modified bituminous membrane ply product and metal roof product specified. Samples shall represent actual product, color, and patterns.

G. 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 specified 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, are chemically and physically compatible with each other, and are suitable for inclusion in the total roof system specified.

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-degrees F. and 80-degrees F., 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 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.

B. 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.

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 roofing manufacturer’s recommendations and shall be compatible with specified roofing system.

2.4 EDGE TREATMENT AND ROOF PENETRATION FLASHIINGS – 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.

2.5 ROOF MATERIALS – METAL ROOF

A. Galvalume structural metal roof panels with exposed fasteners.

B. Plywood sheathing as required for installation of new panels.

C. Panel Profile shall match removed panel profile.

D. Panel Gauge: Minimum 24 gauge.

E. Panel Width: 3’-0”.

F. Panel length: Precut to the length from the eave to the ridge; angles factory precut.

G. Panel Orientation: Ribs shall run with the pitch of the roof for proper drainage.

2.6 ACCESSORIES – METAL ROOF

A. Provide components required for a complete roof panel assembly including trim, fasciae, clips, seam covers, flashings, sealants, gaskets, fillers, closure strips, and similar items.

B. Flashing and Trim: Provide matching roof trim and fasteners. Provide flashing and trim as required to seal against weather and to provide finished appearance. Finish flashing and trim with same finish system as adjacent metal roof panels.

C. Self-Adhering Sheet Underlayment, High Temperature: Butyl or SBS-modified asphalt; slip-resisting-polyethylene surfaced; with release paper backing; cold applied.

D. Felt Underlayment: ASTM D 226, Type II, #30 asphalt-saturated organic felts.

E. Slip Sheet: Manufacturer's recommended slip sheet, of type required for application.

F. Finish: Rust inhibitor or paint. Contracting Officer to select the color.

PART 3 - EXECUTION

3.1 DEMOLITION

A. Disconnect and remove lightning protection system, retain and protect for re-installation.

Contractor is responsible for ensure system is re-installed in same manner as it is removed.

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

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, parapet walls, 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 – BITUMEN ROOF

A. General: Clean surfaces thoroughly prior to installation.

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

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

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

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

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

G. 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.

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

4. Wood 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 dome wall 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 dome wall 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.

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

J. Roof Walkways: Provide walkways in areas indicated on the Drawings.

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.

3.7 PREPARATION – METAL ROOF

A. General: Clean surfaces thoroughly prior to installation.

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

3.8 INSTALLATION, GENREAL – METAL ROOF

A. Metal Protection: Where dissimilar metals will contact each other or corrosive substrates, protect against galvanic action by painting contact surfaces with bituminous coating or by other permanent separation as recommended by SMACNA.

1. Coat the backside of the sheet metal flashing and trim with bituminous coating where flashing and trim will contact wood, ferrous metal, or cementitious construction.

2. Underlayment: Where installing metal flashing directly on cementitious or wood substrates, install a course of felt underlayment and cover with slip sheet.

3.9 INSTALLATION – METAL ROOF

A. Substrate: Attach 5/8” plywood sheeting to the top of the roof framing members.

B. Felt Underlayment: Install felt underlayment with adhesive for temporary anchorage. Apply in shingle fashion to shed water, with lapped joints of not less than 2 inches.

C. Apply slip sheet underlayment before installing metal roof panels.

D. Install flashings to cover underlayment.

E. Metal Roof Panels: Secure metal panels to plywood with fasteners or clips per manufacturers requirements. Re-attach to existing rain gutter and seal the edge watertight.

F. Sealant/Caulking: Sealant must adhere to painted metal surfaces and provide some elasticity as metal expands and contracts with changing weather. Apply a sealant at metal laps or junctions that intersect trims and panels.

3.10 ROOF FLASHING INSTALLATION – METAL ROOF

A. General: Install sheet metal flashing and trim to comply with performance requirements, sheet metal manufacturer's written installation instructions, and SMACNA's "Architectural Sheet Metal Manual." Provide concealed fasteners where possible, set units true to line, and level as indicated. Install work with laps, joints, and seams that will be permanently watertight and weather resistant.

B. Roof Edge Flashing: Anchor to resist uplift and outward forces according to recommendations in SMACNA's "Architectural Sheet Metal Manual" and as indicated. Interlock bottom edge of roof edge flashing with continuous cleat anchored to substrate at staggered 3-inch centers.

C. Counterflashing: Coordinate installation of counterflashing with installation of base flashing.

Insert counterflashing in reglets or receivers and fit tightly to base flashing. Extend counterflashing 4 inches over base flashing. Lap counterflashing joints a minimum of 4 inches and bed with sealant.

3.11 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.

3.12 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.

END OF SECTION