Weston TPO Roofing Specifications Bid Document.docx.pdf

Kearsley Community Schools

Weston Elementary School

2499 Cashin St.

Burton, MI 48509

SECTION 075423

THERMOPLASTIC POLYOLEFIN (TPO) MEMBRANE ROOFING

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. Adhered TPO membrane roofing system.

B. Roof insulation.

1.2 RELATED SECTIONS

A. Division 03 Section “Concrete” for concrete.

B. Division 05 Section "Steel Decking" for steel roof deck.

C. Division 06 Section "Miscellaneous Rough Carpentry" for wood nailers, cants, curbs, and blocking

D. Division 07 Section "Sheet Metal Flashing and Trim" flashings and counter flashings.

E. Division 22 Section "Storm Drainage Piping Specialties" for roof drains.

1.3 REFERENCES

A. Roofing Terminology: Refer to the following publications for definitions of roofing work related terms in this

Section:

1. ASTM D 1079 “Standard Terminology Relating to Roofing and Waterproofing.”

2. Glossary of NRCA’s “The NRCA Roofing and Waterproofing Manual.”

3. Roof Consultants Institute “Glossary of Building Envelope Terms.”

4. Single Ply Roofing Industry (SPRI)

5. International Building Code (IBC)

6. American Society of Civil Engineers (ASCE-7) Minimum Design Loads for Buildings & Other

Structures

B. Sheet Metal Terminology and Techniques: SMACNA “Architectural Sheet Metal Manual.”

1.4 DESIGN CRITERIA

A. General: Installed roofing membrane system shall remain watertight; and resist specified wind uplift pressures, thermally induced movement, and exposure to weather without failure.

B. Material Compatibility: Roofing materials shall be compatible with one another under conditions of service and application required, as demonstrated by roofing system manufacturer based on testing and field experience.

C. Installer shall comply with current code requirements based on authority having jurisdiction.

D. Wind Uplift Performance: Roofing system shall meet the intent of systems that have been successfully tested by a qualified testing and inspecting agency to resist wind uplift pressure calculated in accordance with ASCE 7.

E. Fire-Test-Response Characteristics: Provide 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. Materials shall be identified with appropriate markings of applicable testing and inspecting agency.

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

1.5 SUBMITTALS

A. Product Data: Manufacturer’s data sheets for each product to be provided.

B. Detail Drawings: Provide roofing system details and details of attachment to other work, including:

1. Base flashings and membrane terminations.

2. Tapered insulation, including slopes.

3. Crickets, saddles, and tapered edge strips, including slopes.

4. Insulation fastening and adhesive patterns.

C. Verification Samples: Provide for each product specified.

D. Installer Certificates: Confirmation that installer is approved, authorized, or licensed by manufacturer to install roofing system.

E. Guarantees: Provide manufacturer’s current guarantee specimen.

F. Prior to roofing system installation, roofing sub-contractor shall provide a copy of the Guarantee

Application Confirmation document issued by Johns Manville Roofing Systems indicating that the project has been reviewed for eligibility to receive the specified guarantee and registered.

1.6 QUALITY ASSURANCE

A. Installer Qualifications: Qualified firm that is approved, authorized, or licensed by roofing system manufacturer to install manufacturer's product and who is eligible to receive the specified manufacturer's guarantee.

B. Manufacturer Qualifications: Qualified domestic U.S. owned and based manufacturer that has UL listing or accredited testing agency listing for roofing system identical to that used for this Project.

C. Testing Agency Qualifications: An independent testing agency with the experience and capability to conduct the testing indicated, as documented according to ASTM E 329.

D. Test Reports:

1. Roof drain and leader test or submit plumber’s verification.

2. Core cut, if required.

3. Roof deck fastener pullout test, if required.

4. Roof deck Bonded pull test, if required.

E. Moisture Survey, if required:

1. Submit prior to installation, results of a non-destructive moisture test of roof system completed by approved third party. Utilize one of the approved methods:

a. Infrared Thermography

b. Nuclear Backscatter

F. Source Limitations: Obtain all components from the single source roofing manufacturer guaranteeing the roofing system. All products used in the system shall be labeled by the single source roofing manufacturer issuing the guarantee.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Deliver roofing materials in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, and directions for storage.

B. Store liquid materials in their original undamaged containers in a clean, dry, protected location and within the temperature range required by roofing system manufacturer.

C. Protect roof insulation materials from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. Comply with insulation manufacturer's written instructions for handling, storing, and protecting during installation.

D. Handle and store roofing materials and place equipment in a manner to avoid permanent deflection of deck.

1.8 PROJECT CONDITIONS

A. Weather Limitations: Proceed with installation only when current and forecasted weather conditions permit roofing system to be installed in accordance with manufacturer's written instructions and guarantee requirements.

1.9 GUARANTEE

A. Provide manufacturer's system guarantee equal to:

1. Guarantee Period: 20 years from date of Substantial Completion.

B. Installer’s Guarantee: Submit roofing Installer's guarantee, including all components of roofing system for the following guarantee period:

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

C. Existing Guarantees: Guarantees on existing building elements should not be affected by scope of work.

1. Installer is responsible for coordinating with building owner’s representative to verify compliance.

PART 2 - PRODUCTS

2.1 THERMOPLASTIC POLYOLEFIN ROOFING MEMBRANE - TPO

A. Fabric-Reinforced Thermoplastic Polyolefin Sheet: ASTM D 6878, uniform, flexible sheet formed from a thermoplastic polyolefin, internally fabric or scrim reinforced. Basis of design: JM TPO

1. Membrane Thickness: 60 mils (1.52 mm), nominal

2. Exposed Face Color: White

2.2 AUXILIARY ROOFING MATERIALS – SINGLE PLY

A. General: Auxiliary materials recommended by roofing system manufacturer for intended use and compatible with membrane roofing.

1. Liquid-type auxiliary materials shall meet VOC limits of authorities having jurisdiction.

B. Sheet Flashing: Manufacturer’s internally reinforced or scrim reinforced. Basis of design: JM TPO 60 mil

C. Bonding Adhesive: Manufacturer’s standard solvent-based bonding adhesive for membrane. Basis of design:

1. Serviceable Installation Ambient Air Temperature: 25°F and rising

D. Liquid Applied Flashing: Manufacturer’s single ply liquid and fabric reinforced flashing system created with a fleece polyester scrim and a two-component polyurethane-based liquid applied flashing material, consisting of a liquid resin and a curing agent. Basis of design: JM SP Liquid Flashing Resin and JM SP

Liquid Flashing Scrim http://www.jm.com/content/dam/jm/global/en/commercial-roofing/Guarantees-Warranties/RS-2356-1_SPPeakAdvantageGtyGuide.pdf

E. Liquid Applied Flashing Primer: Manufacturer’s single ply liquid flashing primer. Basis of design: JM SP

Liquid Flashing TPO and PVC Primer, JM SP Liquid Flashing Concrete Primer, or JM SP Liquid Flashing

Metal and Wood Primer

F. Metal Termination Bars: Manufacturer’s standard predrilled stainless-steel or aluminum bars, with anchors.

Basis of design: JM Termination Systems

G. Fasteners for metal and concrete deck areas: Factory-coated steel fasteners and metal plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening membrane to substrate, and acceptable to membrane roofing system manufacturer. Basis of design:

H. Miscellaneous Accessories: Provide all accessories to meet the roofing manufacturer’s guarantee requirements.

2.3 WALKWAYS AND SAFETY STRIPS

A. Flexible Walkways: Factory-formed, nonporous, heavy-duty, slip-resisting, surface-textured walkway pads sourced from membrane roofing system manufacturer. Basis of design: [JM TPO Walkpad] [JM TPO

Safety Walkpad]

B. Safety Strips: Manufacturer’s minimum 65 mils total thickness, comprise of 30 mil yellow non-reinforced

TPO membrane laminated to 35 mil white cured seaming tape. Basis of design: JM Single Ply Safety Strip

1. Exposed Face Color: Yellow

2.4 ROOF INSULATION

A. General: Preformed roof insulation boards that comply with requirements and referenced standards, selected from manufacturer's standard sizes and of thicknesses indicated.

B. Polyisocyanurate Board Insulation: ASTM C 1289, Type II, Class 1, Grade 2 (20 psi), Basis of design:

ENRGY 3

1. Provide insulation package with minimum R Value: R30

2. Provide insulation package with minimum thickness: 5.2”.

3. Provide insulation package in multiple layers.

4. Minimum Long-Term Thermal Resistance (LTTR): 5.7 per inch.

a. Determined in accordance with CAN/ULC S770 at 75ºF (24ºC)

1.2 TAPERED INSULATION

A. Tapered Insulation: ASTM C 1289, Type II, Class 1 Grade 2 (20 psi), provide factory-tapered insulation boards fabricated to slope of 1/4 inch per 12 inches (1:48), unless otherwise indicated. Basis of design:

Tapered ENRGY 3

1.3 INSULATION ACCESSORIES

A. General: Roof insulation accessories recommended by insulation manufacturer for intended use and compatible with membrane roofing.

B. Provide saddles, crickets, tapered edge strips, and other insulations shapes where indicated for sloping to drain. Fabricate to slopes indicated. Basis of design: Tapered Fesco Edge Strips.

C. Fasteners for metal deck areas: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening roof insulation to substrate, and furnished by roofing system manufacturer. Basis of design: UltraFast Fasteners and UltraFast Plates.

D. Wood Nailer Strips: Comply with requirements in Division 06 Section "Miscellaneous Rough Carpentry."

1.4 EDGE METAL COMPONENTS

A. Shop-Fabricated Edge Metal: Custom-fabricated edge metal meeting the criterion of ANSI/SPRI ES-1.

Must be approved by manufacturer technical representative. Minimum requirements:

1. Steel: 24 gauge, fastened 6 inches on center.

2. Aluminum: 0.05 inch thick, fastened 6 inches on center.

B. Metal Flashing Sheet: Metal flashing sheet is specified in Division 07 Section "Sheet Metal Flashing and

Trim."

C. Roof Edge Drainage Systems: Gutter Systems: Manufactured in section lengths not exceeding 12 feet with

0.100-inch mill aluminum internal Gutter Hangers, 24 inches on center, and 2-inch-wide formed external wind straps 6’-0” on center

PART 2 - EXECUTION

2.1 EXAMINATION

A. Examine substrates, areas, and conditions for compliance with the requirements affecting performance of roofing system.

1. General:

a. Verify that roof openings and penetrations are in place and set and braced and that roof drains are securely clamped in place.

b. Verify that wood cants, blocking, curbs, and nailers are securely anchored to roof deck at penetrations and terminations and that nailers match thicknesses of insulation.

2. Steel Decks:

a. Verify that surface plane flatness and fastening of steel roof deck complies with requirements in Division 05 Section "Steel Decking."

b. Verify that decking is visibly dry and free of moisture.

c. Verify that the decking is smooth and free of large cracks, holes, or sharp changes in elevation of the surface.

d. When applicable perform pull test with the specific fastener being used on the project to confirm the fastener resistance meets the requirements for that particular system.

3. Concrete Decks:

a. Verify that concrete curing compounds that will impair adhesion of roofing components to roof deck have been removed.

b. Verify that concrete substrate is visibly dry and free of moisture.

4. Gypsum Deck:

a. Verify that gypsum is visibly dry, free of moisture, and that there are no signs of staining.

b. Inspect deck for cracking and deflection of bulb tees.

c. Verify that gypsum has ability to provide minimum fastener pull-out resistance.

d. Provide documentation of minimum pull-out (ANSI/SPRI FX-1 2016) or adhesion resistance

(ANSI/ SPRI 1A-1 2015) values using manufacturers approved procedures, whichever is applicable.

5. Ensure general rigidity and proper slope for drainage.

6. Verify that deck is securely fastened with no projecting fasteners and with no adjacent units more than 1/16 inch (1.6 mm) out of plane relative to adjoining deck.

B. Unacceptable panels should be brought to the attention of the General Contractor and Project Owner’s

Representative and shall be corrected prior to installation of roofing system.

2.2 PREPARATION

A. Clean and remove from substrate sharp projections, dust, debris, moisture, and other substances detrimental to roofing installation in accordance with roofing system manufacturer's written instructions.

B. Prevent materials from entering and clogging roof drains and conductors and from spilling or migrating onto surfaces of other construction.

C. If applicable, prime surface of deck at a rate recommended by roofing manufacturer and allow primer to dry.

D. Proceed with each step of installation only after unsatisfactory conditions have been corrected.

2.3 RE-ROOF PREPARATION

A. Remove all roofing membrane, surfacing, coverboards, insulation, fasteners, asphalt, pitch, adhesives, etc.

1. Remove an area no larger than can be re-roofed in one day.

B. Tear out all base flashings, counter flashings, pitch pans, pipe flashings, vents, sumps and like components necessary for application of new membrane.

C. Remove abandoned equipment curbs, skylights, smoke hatches, and penetrations.

1. Install decking to match existing as directed by Owner's Representative.

D. Raise (disconnect by licensed craftsmen, if necessary) all HVAC units and other equipment supported by curbs to conform with the following:

1. Modify curbs as required to provide a minimum 8" base flashing height measured from the surface of the new membrane to the top of the flashing membrane.

2. Secure flashing and install new metal counterflashing prior to re-installation of unit.

3. Perimeter nailers shall be elevated to match elevation of new roof insulation.

E. Immediately remove all debris from roof surface. Demolished roof system may not be stored on the roof surface.

2.4 INSULATION INSTALLATION

A. Coordinate installation of roof system components so insulation and cover board are not exposed to precipitation or left exposed at the end of the workday.

B. Comply with roofing system manufacturer's written instructions for installation of roof insulation and cover board.

C. Install tapered insulation under area of roofing to conform to slopes indicated.

D. Install insulation boards with long joints in a continuous straight line. Joints should be staggered between rows, abutting edges and ends per manufacturer’s written instructions. Fill gaps exceeding 1/4 inch (6

mm) with like material.

E. Install 2 or more layers with joints of each succeeding layer staggered from joints of previous layer a minimum of 6 inches (150 mm) in each direction.

F. Trim surface of insulation boards where necessary at roof drains so completed surface is flush and does not restrict flow of water.

G. Install tapered edge strips at perimeter edges of roof that do not terminate at vertical surfaces.

H. (At concrete and gypsum deck areas) Adhered Insulation: Adhere insulation to substrate as follows:

1. Install each layer in a two-part urethane adhesive according to roofing system manufacturer’s instruction.

2. Install each layer to resist uplift pressure at corners, perimeter, and field of roof.

I. (At metal deck areas) Loose Laid Insulation with Top Insulation Layer Mechanically Fastened:

Loose lay insulation with staggered joints and secure top layer of insulation to deck using mechanical fasteners designed and sized for fastening specified board-type to deck type.

1. Fasten top layer to resist uplift pressure at corners, perimeter, and field of roof.

2.5 ROOFING MEMBRANE INSTALLATION, GENERAL

A. Install roofing membrane in accordance with roofing system manufacturer's written instructions, applicable recommendations of the roofing manufacturer and requirements in this Section.

B. Cooperate with testing and inspecting agencies engaged or required to perform services for installing roofing system.

C. Coordinate installing roofing system so insulation and other components of the roofing membrane system not permanently exposed are not subjected to precipitation or left uncovered at the end of the workday or when rain is imminent.

1. Provide tie-offs at end of each day's work to cover exposed roofing membrane sheets and insulation.

2. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing system.

3. Remove and discard temporary seals before beginning work on adjoining roofing.

2.6 ADHERED ROOFING MEMBRANE INSTALLATION

A. Install roofing membrane over area to receive roofing in accordance with membrane roofing system manufacturer's written instructions.

1. Unroll roofing membrane and allow to relax before installing.

2. Install sheet in accordance with roofing system manufacturer’s written instructions.

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

C. Solvent Based Bonding Adhesive for smooth backed membranes: Apply solvent-based bonding adhesive to substrate and underside of roofing membrane at rate required by manufacturer and allow to partially dry before installing roofing membrane. Do not apply bonding adhesive to splice area of roofing membrane.

D. Mechanically fasten roofing membrane securely at terminations, penetrations, and perimeter of roofing.

E. Apply roofing membrane with side laps shingled with roof slope, where possible.

F. Seams: Clean seam areas, overlap roofing membrane, and hot-air weld side and end laps of roofing membrane according to manufacturer's written instructions to ensure a watertight seam installation.

1. Test lap edges with probe to verify seam weld continuity. Apply lap sealant to seal cut edges of roofing membrane.

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

a. Remove and repair any unsatisfactory sections before proceeding with installation.

3. Repair tears, voids, and incorrectly lapped seams in roofing membrane that do not meet requirements.

G. Spread sealant or mastic bead over deck drain flange at deck drains and securely seal roofing membrane in place with clamping ring.

2.7 BASE FLASHING INSTALLATION

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

B. Apply solvent-based bonding adhesive at required rate and allow too partially dry. Do not apply bonding adhesive to seam area of flashing.

C. Apply single ply liquid applied flashing system per manufacturer’s written instructions.

D. Flash penetrations and field-formed inside and outside corners per manufacturer’s installation instructions.

E. Clean seam areas and overlap and firmly roll sheet flashings into the adhesive. Weld side and end laps to ensure a watertight seam installation.

F. Terminate and seal top of sheet flashings and mechanically anchor to substrate through termination bars.

2.8 EDGE METAL INSTALLATION

A. Examine substrates and conditions under which sheet metal flashing and trim are to be installed and verify that work may properly commence. Do not proceed with installation until unsatisfactory conditions have been corrected.

B. Provide edge details as indicated on the Drawings. Install in accordance with the membrane manufacturer's requirements and SMACNA's "Architectural Sheet Metal Manual."

C. Join individual sections in accordance with the membrane manufacturer's requirements and SMACNA's

"Architectural Sheet Metal Manual."

2.9 WALKWAY INSTALLATION

A. Flexible Walkways: Install walkway products in locations indicated. Heat weld and adhere walkway products to substrate according to roofing system manufacturer's written instructions.

2.10 FIELD QUALITY CONTROL

A. Final Roof Inspection: Arrange for roofing system manufacturer's technical representative to inspect roofing installation on completion and submit report to Architect.

1. Notify Architect or Owner 48 hours in advance of date and time of inspection.

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

C. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.

2.11 PROTECTION AND CLEANING

A. Protect roofing system from damage and wear during remainder of construction period.

B. 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.

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

END OF SECTION 075423

PART II – MISCELLANEOUS PROVISIONS

1. MANDATORY ONSITE PRE-BID MEETING / WALKTHROUGH – WEDNESDAY MAY 21, 2025 @ 11:00 AM

2. CONTRACTOR MUST AGREE TO START ROOF PROJECT ON OR BEFORE JUNE 23, 2025

3. VOLUNTARY ALTERNATES WILL BE ACCEPTED

4. SEALED BIDS ARE TO BE DELIVERED TO:

A. KEARSLEY COMMUNITY SCHOOL DISTRICT

CENTRAL ADMINISTRATION BUILDING

4396 UNDERHILL DRIVE, FLINT, MI 48506

C/O PETER LOFIEGO / RON MARCH

B. YOU MUST ALSO SUBMIT AN ELECTRONIC COPY TO THE FOLLOWING EMAIL ADDRESS:

PLOFIEGO@KEARSLEYSCHOOLS.ORG / RMARCH@KEARSLEYSCHOOLS.ORG

C. NO BID WILL BE ACCEPTED AFTER 11:00 AM ON FRIDAY, MAY 30, 2025

5. THE RIGHT IS RESERVED TO ACCEPT OR REJECT ANY OR ALL BIDS OR ANY PART OF SAME, TO

WAIVE IRREGULARITIES AND/OR INFORMALITIES IN BIDS AND TO MAKE THE AWARD IN WHOLE

OR IN PART AS MAY APPEAR IN THE BEST INTERESTS OF KEARSLEY COMMUNITY SCHOOL DISTRICT.

mailto:plofiego@kearsleyschools.org mailto:rmarch@kearsleyschools.org