00017135 Exhibit 5 Specifications.docx

SALEM AMTRAK TRAIN STATION ROOF REPLACEMENT

SECTION 07 54 23 THERMOPLASTIC SINGLE -PLY ROOFING (TPO)

SECTION 07 54 23 – THERMOPLASTIC SINGLE-PLY ROOFING (TPO)

GENERAL

SUMMARY

Section Includes:

Thermoplastic single-ply roofing system.

Roof insulation.

Coverboard Accessory roofing materials.

Walkways

REFERENCES

American Society of Civil Engineers (ASCE) - ASCE 7-16 Minimum Design Loads for Buildings and Other Structures, Current Revision.

ASTM International (ASTM):

ASTM C 1289 - Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board ASTM D 1079 - Standard Terminology Relating to Roofing, Waterproofing, and Bituminous Materials.

ASTM D 6878 - Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing.

ASTM E 96 - Standard Test Methods for Water Vapor Transmission of Materials International Code Council (ICC):

International Building Code (IBC National Roofing Contractors Association (NRCA) - Low Slope Roofing and Waterproofing Manual, Current Edition.

Underwriters Laboratories (UL):

TGFU R1306 - "Roofing Systems and Materials Guide".

UL-790 - Standard Test Method for Fire Tests of Roof Coverings.

DESIGN CRITERIA

Wind Uplift Performance:

Roof system is designed to withstand wind uplift forces as calculated using the current revision of ASCE-7.

Fire Resistance Performance:

Roof system will achieve a UL Class A rating when tested in accordance with UL-790.

Thermal Performance: Roof system will achieve a minimum R value not less than R-30.

Drainage: Provide a roof system with positive drainage where all standing water dissipates within 48 hours after precipitation ends.

Building Codes:

Roof system will meet the requirements of all federal, state and local code bodies having jurisdiction.

PREINSTALLATION MEETING

Preinstallation Conference: Conduct conference at Project site.

ACTION SUBMITTALS

Product Data: For each type of product.

For roofing materials, insulation and roof system components supply manufacturers printed product material descriptions and installation instructions.

Shop Drawings: Include roof plans, sections, details, and attachments to other work, including the following:

TPO membrane installation.

Base flashings and membrane terminations.

Flashing details at roof penetrations.

Flashing details at parapets and roof mounted equipment.

Flashing details at walls, chimney and other roof elements.

Layout and thickness of insulation.

Tapered insulation thickness and slopes.

Wind Uplift Resistance Submittal: Roofing manufacturers requirements/acceptance for roofing system, indicating compliance with wind uplift performance requirements at project location.

INFORMATIONAL SUBMITTALS

Sample warranties.

CLOSEOUT SUBMITTALS

Maintenance data.

QUALITY ASSURANCE

Qualifications:

Manufacturers: All products specified in this section will be supplied by a single manufacturer with a minimum of 20 years’ experience providing roofing products.

Installers: A qualified firm with a minimum of 5 years’ experience and is approved, authorized, or licensed by roofing system manufacturers to install manufacturer's product. Manufacturers shall provide a written letter of contractor approval under current date.

DELIVERY, STORAGE, AND HANDLING

Store products in manufacturer's unopened packaging until ready for installation.

Store and dispose of hazardous materials, and materials contaminated by hazardous materials, in accordance with requirements of local authorities having jurisdiction.

Safety Data Sheets (SDS) must always be on location during the transportation, storage and application of materials.

When loading materials onto the roof, the Authorized Roofing Applicator must comply with the requirements of the building owner to prevent overloading and possible disturbance to the building structure.

PROJECT CONDITIONS

Proceed with roofing work only when weather conditions are in compliance with the manufacturers’ recommended limitations, and when conditions will permit the work to proceed in accordance with the manufacturer’s requirements and recommendations.

Proceed with work so new roofing materials are not subject to construction traffic. When necessary, new roof sections shall be protected and inspected upon completion for possible damage.

The surface on which the insulation or roofing membrane is to be applied shall be clean, smooth, dry, and free of projections or contaminants that would prevent proper application of or be incompatible with the new installation, such as fins, sharp edges, foreign materials, oil and grease.

New roofing shall be complete and weather tight at the end of the workday.

WARRANTY

Warranty: Manufacturer agrees to repair or replace components of roofing system that fail in materials or workmanship within specified warranty period with No Dollar Limit.

Warranty Period: 25 years from date of Substantial Completion.

PRODUCTS

MANUFACTURERS

Acceptable manufactures include:

Carlisle SynTec Johns Manville Elevate Or approved substitutions

THERMOPLASTIC ROOFING

TPO membrane.

Membrane Thickness: 80 mils.

Exposed Face Color: White.

ROOF INSULATION/COVERBOARDS

Coverboard: Rigid board with coated glass fiber mat facers (CGF) on both sides, meeting or exceeding the requirements of ASTM C 1289, Type II, Class 4, Grade 1.

Compressive Strength: 80 psi min.

Board Thickness: 1/2 inch. Rigid board with coated prime fiberglass-mat faced gypsum roof boards manufactured to meet ASTM C1177/C1177M DensDeck Prime Roof Board Board Thickness: 1/2 inch Polyisocyanurate Board Insulation: ASTM C1289, Type II, Class 1, Grade 2, glass reinforced felt on both major surfaces.

Size: 48 by 96 inches.

Thickness:

Layers: 2 layers of 2.6” thick (R-30) polyisocyanurate insulation.

Tapered Insulation: Provide factory-tapered insulation boards.

Material: Match roof insulation.

Minimum Thickness: 1/4 inch.

Slope:

Roof Field: NA, existing roof has built in slopes.

Cricket slopes as required for positive drainage and as shown on roof plan.

VAPOR BARRIER

Vapor Retarder: 40-mil composite consisting of 35-mils of self-adhering rubberized asphalt laminated to a 5-mil woven polypropylene film installed in compliance with manufacturer’s instructions.

ACCESSORY ROOFING MATERIALS

General: Accessory materials recommended by roofing system manufacturers for intended use and compatible with other roofing components.

Flashing: Manufacturer's standard sheet flashing of same material, type, reinforcement, thickness, and color as TPO sheet.

Prefabricated Pipe Flashings: As recommended by roof membrane manufacturer.

Bonding Adhesive: Manufacturer's standard.

Adhesives and Sealants: Comply with VOC limits of authorities having jurisdiction.

Miscellaneous Accessories: Provide pourable sealers, preformed cone and vent sheet flashings, preformed inside and outside corner sheet flashings, T-joint covers, lap sealants, termination reglets, and other accessories.

WALKWAYS

Flexible Walkways: Factory-formed, nonporous, heavy-duty, slip-resisting, surface-textured walkway pads 30” x 60” and approximately 3/16 inch thick and acceptable to roofing system manufacturer.

Color: Contrasting with roof membrane.

EXECUTION

EXAMINATION

Examine substrates, areas, and conditions with Installer present, for compliance with requirements and other conditions affecting performance of the Work.

INSTALLATION OF ROOFING, GENERAL

Install complete roofing system according to roofing system manufacturer's written instructions.

Coordinate installing roofing system components, so insulation is not exposed to precipitation or left exposed at end of workday.

Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing system at end of workday or when rain is forecast. Remove and discard temporary seals before beginning work on adjoining roofing.

INSTALLATION OF ADHERED ROOF MEMBRANE ASSEMBLY

Adhere vapor retarder to exposed roof deck.

Comply with roofing system and insulation manufacturer's written instructions for installing roof insulation and coverboard using manufacturer’s recommended insulation adhesive.

Adhere roof membrane over area to receive roofing according to roofing system manufacturer's written instructions.

Unroll roof membrane and allow to relax before installing.

Accurately align roof membrane and maintain uniform side and end laps of minimum dimensions required by manufacturer. Stagger end laps.

Bonding Adhesive: Apply adhesive to coverboard and roof membrane at rate required by manufacturer and allow to partially dry before installing roof membrane. Do not apply to splice area of roof membrane.

Apply roof membrane with side laps shingled with slope of roof deck where possible.

Seams: Clean seam areas, overlap roofing, and hot-air weld side and end laps of roof membrane and sheet flashings to ensure a watertight seam installation.

Hot air weld seams.

Test lap edges with probe to verify seam weld continuity. Apply lap sealant to seal cut edges of roof membrane and sheet flashings.

Verify field strength of seams a minimum of twice daily, and repair seam sample areas.

Repair tears, voids, and lapped seams in roof membrane that do not comply with requirements.

Spread sealant bed over deck-drain flange at roof drains and securely seal roof membrane in place with clamping ring.

INSTALLATION OF BASE FLASHING

Install sheet flashings and preformed flashing accessories and adhere to substrates according to roofing system manufacturer's written instructions.

Apply bonding adhesive to substrate and underside of sheet flashing at required rate and allow to partially dry. Do not apply to seam area of flashing.

Flash penetrations and field-formed inside and outside corners with cured or uncured sheet flashing.

Clean seam areas, overlap, and firmly roll sheet flashings into the adhesive. Hot-air weld side and end laps to ensure a watertight seam installation.

Parapet flashing to be extended up, and over, parapet wall.

INSTALLATION OF WALKWAYS

Flexible Walkways: Install walkway products according to manufacturer's written instructions.

Install flexible walkways at the following locations:

Perimeter of each rooftop unit.

Between each rooftop unit location, creating a continuous path connecting rooftop unit locations.

Between each roof and each rooftop unit location or path connecting rooftop unit locations.

Top and bottom of each roof access ladder.

Between each roof access ladder and each rooftop unit location or path connecting rooftop unit locations.

As required by roof membrane manufacturer's warranty requirements.

Provide 6-inch clearance between adjoining pads.

Heat weld to substrate or adhere walkway products to substrate with compatible adhesive according to roofing system manufacturer's written instructions.

FIELD QUALITY CONTROL

Final Roof Inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation on completion, in presence of Architect, and to prepare inspection report.

Repair or remove and replace components of roofing system where inspections indicate that they do not comply with specified requirements.

PROTECTING AND CLEANING

Protect roofing system from damage and wear during remainder of construction period. When remaining construction does not affect or endanger roofing, inspect roofing system for deterioration and damage, describing its nature and extent in a written report, with copies to the Construction Project Manager.

Correct deficiencies in or remove roofing system that does not comply with requirements, repair substrates, and repair or reinstall roofing system to a condition free of damage and deterioration at time of Substantial Completion and according to warranty requirements.

Clean overspray and spillage from adjacent construction using cleaning agents and procedures recommended by manufacturers of affected construction.

END OF SECTION 07 53 23

Copyright © 2024 by the American Institute of Architects. Warning: This AIA MasterSpec-based document is protected by U.S. Copyright Law and International Treaties. It was created by "Oregon Department of Transportation" for "Building A Reroof". A valid, current MasterSpec license is required for editing and use of this document for any other project.(25415)

Copyright © 2024 by the American Institute of Architects. Warning: This AIA MasterSpec-based document is protected by U.S. Copyright Law and International Treaties. It was created by "Oregon Department of Transportation" for "Building A Reroof". A valid, current MasterSpec license is required for editing and use of this document for any other project.(25415)

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Copyright © 2024 by the American Institute of Architects. Warning: This AIA MasterSpec-based document is protected by U.S. Copyright Law and International Treaties. It was created by "Oregon Department of Transportation" for "Building A Reroof". A valid, current MasterSpec license is required for editing and use of this document for any other project.(25415)