10-!MP27004-27311640 DFCM Addendum 2.pdf

DFCM Addendum Cover Page, 9.2.2026

DFCM Addendum #2 Reference: UTU Taylor Health Emergency Roof Replacement DFCM Project #27311640 U3P Event #MP27004

Date: September 15, 2026

To: PreQualified Roofing Contractors

From: The Division of Facilities Construction and Management

Note: This Addendum shall be included as part of the Contract Documents. Items in this Addendum apply to all drawings and specification sections whether referenced or not involving the portion of the work added, deleted, modified, or otherwise addressed in the Addendum. Bidders are required to acknowledge receipt of this Addendum when their bid is submitted. Failure to do so may subject the Bidder to disqualification.

Addendum Items

Solicitation Schedule Changes: There are no changes to the Solicitation Schedule in this addendum.

DFCM Addendum Items: An alternate has been added to remove and reinstall the skylight for roof replacement Click to enter text Click to enter text Click to enter text

A/E Addendum Items: A/E Addendum # 1 dated September 15, 2026 Click to enter text

Total Attached Pages: 15

730 Pacific Avenue · Salt Lake City, Utah 84104 O 801.521.6186 FFKR. COM Page 1 of 1

ADDENDUM

Project: TAYLOR HEALTH SCIENCE

BUILDING EMERGENCY ROOF

REPLACEMENT

Addendum Number: Add 01

DFCM Project #: 27311640 Date: September 15, Contractor: TBD FFKR Project #: 26063

The Addendum is for all persons preparing Bids for the above-named project; and, as such, shall be made a part of the Documents.

Changes, corrections, and deletions enumerated herein shall be included in the Contractor’s Bid. Bidders should acknowledge receipt of the Addendum in the space provided in the Contractor’s Bid Form. Failure to do so may subject the Bidder to disqualification. In case of any conflict between the drawings, specifications, and this addendum, this addendum shall govern.

Summary: Revisions to scope of work discussed during the Pre-Bid Conference.

Reason for Instruction:

Revisions to Bid Set as described below.

Incorporate changes to Bid documents as follows:

Architectural Addendum

Specifications:

07 5400.2 - DFCM Thermoplastic Membrane Roofing TPO

- Edited paragraph 2.1.A to include Versico Roofing as an approved manufacturer.

Drawings:

None

Supporting Documents:

None

End of Addendum

Utah Tech University Addendum #01 Taylor Health Science Building Emergency Roof Replacement St. George, Utah

DFCM Proj #: 27311640

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SECTION 07 5400.20 - THERMOPLASTIC MEMBRANE ROOFING TPO

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Furnish all labor, materials, equipment, tools, and services to fully complete all

Membrane Roofing work as is indicated on the drawings and/or specified herein including, but not limited to the following described items and conditions. Installers shall be roofing company employee’s approved and trained by roofing manufacturer and not subcontracted to outside roofing companies that provide applicators.

2. Install Thermoplastic Membrane roof with required flashing and terminations as described in these bid documents or provided in pre-bid addenda and as shown on drawings.

3. This roofing application is classified as Mechanically attached (which includes induction welded attachment) system with a thermoplastic roofing membrane.

a. 30 - year State of Utah No Dollar Limit (NDL), Materials and Labor repair or replacement warranty. Warranty shall provide a minimum of 99 miles per hour (mph) wind speed coverage with design enhancements as required. Higher wind speed coverage up to 120 miles per hour maybe required depending upon building composition and geographical location as required in the following bid documents.

b. Selected locations and roofing types as identified by the State of Utah and Architect may require Manufacturer’s Hail warranty coverage including hail up to 2 inch in diameter and maybe required depending upon building composition and geographical location as required in the following bid documents. 2-inch warranties are available based on enhanced installation criteria.

4. Insulation, flat and tapered.

a. Insulation in thickness as required to satisfy energy code or per Owner’s requirements.

5. Cover board.

6. Parapet wall sheathing.

7. Flashings. Note: The DFCM requires the same flashing membrane thickness as the field of the roof. All base/wall flashing termination shall have a counterflashing.

8. Roofing stack boots, roofing expansion joints, and walkway pads.

9. Do not include sales tax, refer to Section 00 0104 - Notice to Contractors

B. Related Requirements:

1. Section 06 1000 - Rough Carpentry: Wood nailers and curbs.

2. Section 07 7100 - Roof Specialties: Counterflashing, reglets.

3. Section 07 7200 - Roof Accessories: Prefabricated Roof Hatch Railings, Roof Hydrant.

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C. Reference Standards:

1. ASTM C1278/C1278M - Standard Specification for Fiber-Reinforced Gypsum Panel

2017.

2. ASTM C1177/C1177M - Standard Specification for Glass Mat Gypsum Substrate for

Use as Sheathing 2017.

3. ASTM C1289 - Standard Specification for Faced Rigid Cellular Polyisocyanurate

Thermal Insulation Board 2022.

4. ASTM D2136 - Standard Test Method for Coated Fabrics—Low-Temperature Bend Test

2019, with Editorial Revision (2021).

5. ASTM D6878/D6878M - Standard Specification for Thermoplastic Polyolefin Sheet

Roofing 2021.

6. ASTM D5602/D5602M - Standard Test Method for Static Puncture Resistance of

Roofing Membrane Specimens 2018.

7. ASTM D5635 / D5635M - Standard Test Method for Dynamic Puncture Resistance of

Roofing Membrane Specimens 2011.

8. ASTM D751 - Standard Test Methods for Coated Fabrics 2019.

9. ASTM D7635/7635M – Standard test method for measurement of thickness of Coatings over Fabric Reinforcement.

10. ASTM E96/E96M - Standard Test Methods for Gravimetric Determination of Water

Vapor Transmission Rate of Materials 2021.

11. NRCA (RM) - The NRCA Roofing Manual 2022.

12. NRCA (WM) - The NRCA Waterproofing Manual 2021.

13. UL (FRD) - Fire Resistance Directory Current Edition.

D. Administrative Requirements:

1. Preinstallation Conference: Conduct Conference at Project Site. Comply with requirements in Division 1 Section "Project Management and Coordination" Review methods and procedures related to roofing system including, but not limited to the following:

2. Meet with Owner, Architect, Owner's insurer if applicable, testing and inspecting agency representative, roofing installer, roofing system manufacturer's representative, deck installer, and installers whose work interfaces with or affects roofing including installers of roof accessories and roof-mounted equipment.

3. Review methods and procedures related to roofing installation, including manufacturer's written instructions.

4. Review and finalize construction schedule and verify availability of materials, installer's personnel, equipment, and facilities needed to make progress and avoid delays.

5. Examine deck substrate conditions and finishes for compliance with requirements including flatness and fastening.

6. Review structural loading limitations of roof deck during and after roofing.

7. Review base flashings, special roof details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that will affect roofing system.

8. Review governing regulations and requirements for insurance and certificates if applicable.

9. Review temporary protection requirements for roofing system during and after installation.

10. Review roof observation and repair procedures after roofing installation.

11. Coordinate with installation of associated counter-flashings installed under other sections.

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1.3 ACTION SUBMITTALS

A. See Section 01 3000 - Administrative Requirements for submittal procedures.

B. Product Data: For each type of product.

1. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes.

2. Provide data indicating membrane materials, cover board, insulation, sealants, fasteners, expansion joints and all roofing accessories.

C. Shop Drawings:

1. Submit drawings that indicate joint or termination detail conditions, conditions of interface with other materials.

2. Include plans, elevations, expansion-joint locations, keyed details, and attachments to other work. Distinguish between plant- and field-assembled work.

3. Include details for expansion and contraction; locations of expansion joints, including direction of expansion and contraction.

4. Indicate profile and pattern of seams and layout of fasteners, cleats, clips, and other attachments.

5. Detail termination points and assemblies, including fixed points.

6. Include details of special conditions.

D. Samples for Verification:

1. Submit two (2) material samples illustrating color, size and texture.

2. Include Samples of each type of roof specialty to verify finish and color selection, in manufacturer's standard sizes.

3. Include roof-edge specialties reglets and counterflashings made from 12-inch lengths of full-size components in specified material, and including fasteners, cover joints, accessories, and attachments.

E. Manufacturer's Certificate: Certify that products meet or exceed specified requirements.

F. Manufacturer's Installation Instructions:

1. Provide a copy of installer’s application to the roofing manufacturer that the specified roofing system satisfies all the requirements as specified in these bid documents and as required by the State of Utah DFCM. The Manufacturers Notice of Award/Preinstallation Notice and Accepted Notice of Award (ANOA) or Accepted Preinstallation Notice will be required to verify Manufacturer and Applicator compliance and indicate special procedures, parameters and all conditions requiring special attention.

G. Manufacturer's Field Reports:

1. Installer shall be responsible to provide the Owner or Owner’s representative, copies of all field reports upon request. Reports shall indicate procedures followed, ambient temperatures, humidity, and supplementary instructions given.

H. Manufacturer's qualification statement authored by a technical employee of manufacturer.

I. Installer's qualification statement. Note: Installer’s verification is limited to Roofing applicator and does not include subcontracted or otherwise untrained applicators.

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J. Specimen Warranty: For approval.

K. Warranty:

1. Submit manufacturer warranty and ensure that forms have been completed in Owner's name and registered with manufacturer.

2. Submit installer's written verification that installation complies with warranty conditions for waterproof membrane.

1.4 INFORMATIONAL SUBMITTALS

A. Qualification Data: For manufacturer.

B. Product Certificates: For each type of roof specialty.

C. Product Test Reports: For roof-edge flashings, for tests performed by a qualified testing agency.

D. Sample Warranty: For manufacturer's special warranty.

1.5 CLOSEOUT SUBMITTALS

A. Maintenance Data: For roofing specialties to include in maintenance manuals.

1.6 QUALITY ASSURANCE

A. Perform work in accordance with NRCA Roofing and Waterproofing Manual and manufacturer's instructions.

1. Maintain one copy on site.

B. Roofing Manufacturer and Installer shall be prequalified by the State of Utah DFCM prior to bidding any State of Utah roofing projects.

C. Manufacturer Qualifications: Company specializing in manufacturing the products specified in this section with minimum ten years of documented experience.

D. Installer Qualifications: Company specializing in performing work of this section with at least three years of documented experience.

E. Moisture Protection: See drawings and details for type, quantity, and location of moisture protection work required. Include all administration, facilities and labor required to furnish the expertise, degree of workmanship, materials, and accessories, necessary for the timely and satisfactory integration of the following items into the total building system in compliance with the specifications. The work throughout shall be completed in a manner to assure that no water leakage into the roof system or building results. All details (including metal flashings) relating to the installation of the roof system, shall be approved by the roofing contractor or manufacturer.

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F. Contractor's Review: Along with Manufacturer's Data, submit written statement signed by the roofing subcontractor, stating that the drawings and specifications for roofing and flashing have been reviewed with a technical agent of the roofing manufacturer of the primary roofing materials, and that he is in agreement that the selected systems for roofing and flashing are proper, compatible, and adequate for the applications shown, and that the conditions and details are not in conflict with the roofing manufacturer's roofing and flashing warranty requirements.

Show by copy of transmittal form that copy of statement has been transmitted to roofing manufacturer. (A signed, reviewed copy of the manufacturer's notice of award will satisfy this requirement as stated under 1.06 Submittals, F)

G. Statement of Application: Upon completion of work, submit a statement signed by contractor and roofing subcontractor, stating that the roofing and membrane flashing comply with these specifications, and that the installation methods comply with the manufacturer's printed instructions and are proper and adequate for the conditions of installation and use.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Delivery:

1. Deliver materials in manufacturer's original containers, dry and undamaged, with seals and labels intact, unless otherwise indicated.

B. Storage & Handling:

1. Store materials in weather protected environment, clear of ground and moisture.

2. Do not store roof specialties in contact with other materials that might cause staining, denting, or other surface damage.

3. Store roof specialties away from uncured concrete and masonry.

4. Ensure storage and staging of materials does not exceed static and dynamic load-bearing capacities of roof decking.

5. Protect foam insulation from direct exposure to sunlight.

6. Protect strippable protective covering on roof specialties from exposure to sunlight and high humidity, except to extent necessary for the period of roof-specialty installation.

1.8 FIELD CONDITIONS

A. Field Measurements: Verify profiles and tolerances of roof-specialty substrates by field measurements before fabrication, and indicate measurements on Shop Drawings.

B. Coordination: Coordinate roof specialties with flashing, trim, and construction of parapets, roof deck, roof and wall panels, and other adjoining work to provide a leakproof, secure, and noncorrosive installation.

C. Do not apply roofing membrane during unsuitable weather.

D. Do not apply roofing membrane when ambient temperature is below 40 degrees F (5 degrees C).

E. Do not apply roofing membrane or roof assembly components to damp or frozen deck surface or when precipitation is expected or occurring.

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F. Do not expose materials vulnerable to water or sun damage in quantities greater than can be weatherproofed the same day.

G. Schedule applications so that no partially completed sections of roof are left exposed at end of workday.

1.9 WARRANTY

A. Roofing-System Warranty:

1. See Section 01 7800 - Closeout Submittals for additional warranty requirements.

2. No Dollar Limit System Warranty: Provide manufacturer's system warranty agreeing to repair or replace roofing that leaks or is damaged due to wind speeds up to 99 mph or other natural causes.

3. Warranty Term: 30 years.

4. Warranty shall include Inflationary Coverage.

5. For repair and replacement include costs of both material and labor with no dollar limitation in warranty.

6. The wind speed coverage shall be peak gusts of 99 mph (86.0286 kts) measured at 33 feet

(10 meters) above ground level.

7. Certification is required with bid submittal indicating the manufacturer has reviewed and agreed to such wind coverage. Note: the signed Preinstallation/Notice of Award and Manufacturers Accepted PIN/NOA is acceptable.

B. Special Warranty on Painted Finishes: Manufacturer agrees to repair finish or replace roof specialties that show evidence of deterioration of factory-applied finishes within specified warranty period.

1. Fluoropolymer Finish: Deterioration includes, but is not limited to, the following:

a. Color fading more than 5 Delta E units when tested according to ASTM D2244.

b. Chalking in excess of a No. 8 rating when tested according to ASTM D4214.

c. Cracking, checking, peeling, or failure of paint to adhere to bare metal.

2. Finish Warranty Period: 20 years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Thermoplastic Membrane Manufacturers:

1. Carlisle Syntec

2. Sika Roofing

3. Johns Manville

4. IB Roofing

5. Versico Roofing

6. As previously approved by State of Utah DFCM.

7. Substitutions: See Section 01 6000 - Product Requirements.

B. Insulation:

1. As supplied and warranted by roofing membrane manufacturer.

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C. Cover Board and Parapet Wall Sheathing:

1. Thickness required by conditions and warranty requirements but include the following:

a. Cover Board for Roofs and Wall Sheathing shall have a gypsum core, [1/2] [5/8] inch thickness with coated glass facer. Supplied and warranted by the roofing manufacturer.

b. Cover Board for Roofs shall have a High Density Polyisocyanurate core, 1/2-inch thickness, minimum of 80 psi density, with coated glass facers. Supplied and warranted by the roofing manufacturer.

2. Supplied and warranted by roofing manufacturer:

a. As previously approved by State of Utah DFCM and approved by the Roofing

Manufacturer.

3. Substitutions: See Section 01 6000 - Product Requirements.

2.2 ROOFING -

A. Thermoplastic Membrane Roofing: One ply membrane, mechanically fastened, over insulation, and cover board.

B. Roofing Assembly Requirements:

1. Roof Covering External Fire Resistance Classification: UL (FRD) Class A.

2. Insulation Thermal Value (R), minimum of 30 unless otherwise required by Owner, provide insulation of thickness required.

C. Acceptable Insulation Types - Constant Thickness Application and tapered:

1. Multiple layers of polyisocyanurate board.

2. Pre-shaped, ‘Tapered’ 1.25 lbs. density expanded polystyrene boards. Slopes as identified in specifications and shown in drawings. Unless absolutely required and approved by the DFCM, the final roof slope shall not be less than ¼ inch per foot.

2.3 ROOFING MEMBRANE AND ASSOCIATED MATERIALS

A. TPO Membrane:

1. Material: Reinforced thermoplastic polyolefin (TPO) complying with ASTM D6878.

a. Reinforcing: Polyester Scrim.

b. Thickness:

1) 30 year –0.080 mil, guaranteed thickness.

2. Sheet Width: Factory fabricated into largest sheets possible.

3. Color: As selected by Architect from manufacturer's full color range.

4. Properties:

a. Membrane thickness over scrim:

1) 0.080 – 40 mils minimum; ASTM D7635/D7635M

b. Breaking Strength: 220 lbf (976 N) minimum; ASTM D751 grab method.

c. Tearing Strength: 120 lbf (530 N) minimum; ASTM D751.

d. Brittleness Point: -40 degrees F (-40 degrees C) maximum; ASTM D2137.

e. Puncture Resistance: 300 lbf (1.3 kN) minimum; FTM 101C, method 2031.

f. Ozone Resistance: Pass (no cracks), ASTM D1149, 100 pphm, 168 hrs.

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B. Under the supervision of the Architect/DFCM, test samples cut from delivered roof membrane shall be taken to verify membrane thickness the membrane on site, compliance

C. Seaming Materials: Hot air weld. No solvents or adhesives are allowed to be used as membrane seaming methods.

D. Membrane Fasteners: As recommended and approved by membrane manufacturer but include the following as approved:

1. Inseam fasteners and plates including low profile plates for visible applications.

2. Induction weld plates and appropriate fasteners.

3. Bars and buffer cords.

4. As required by manufacturer and approved by Architect.

E. Flashing Material:

1. Sheet Membrane:

a. Sheet membrane flashing shall be the same thickness and type as the roof membrane. Sheet membrane flashing shall include asphalt and chemical resistant membrane when non-compatible conditions are present. Membrane color shall be selected by Architect.

b. Membrane shall be adhesively applied with seams hot air welded. Self-adhered membranes are acceptable, but membrane seams are required to be hot air welded.

2. Membrane Clad Flashing:

a. 24-gauge galvanized metal with manufacturers membrane laminated to the sheet metal surface. Membrane color shall be selected by Architect or at a minimum match the selected color of the field membrane. Supplied and warranted by membrane manufacturer.

b. 24-gauge, T-304 Stainless Steel with manufacturers membrane laminated to the sheet metal surface. Stainless Steel primer is required for sealant adhesion. Color is white. Application should be limited to environments where galvanized and aluminum metals are susceptive to corrosion and non-compatibility.

c. Clad metal accessories include sealants, hot air welded membrane cover-strips, foil bond breaker tape, high wind hold down cleats, fasteners, and sealants.

3. Prefinished Kynar/Hylar Metal Flashing:

a. 24 gauge (Minimum) prefinished sheet metal fabricated to satisfy the State of Utah

DFCM clip on edge detail for flashing over a coated metal detail.

4. Pre-manufactured Coping, Fascia, and Drip Edge:

a. Prefabricated flashing shall include 20 gauge formed rail with stainless steel spring clips and Kynar finished 24-gauge galvanized steel cover in 12’ foot lengths.

Finish color shall be selected by Architect. Supplied and warranted by membrane manufacturer.

b. Pre-manufactured flashing shall include a high wind warranty as determined by State of Utah DFCM and Specifier.

5. Reinforced Liquid Applied Membrane (LAM):

a. Provided by membrane manufacturer for unique applications that include penetrations including angle iron, supports and surfaces that sheet membrane or clad flashings are cumbersome. Compatible Liquid Applied Membranes (L.A.M.)

include:

b. Polyurethane L.A.M. with polyester or fiberglass reinforcements.

c. PMMA L.A.M. with polyester reinforcement.

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d. Note: Liquid Applied Membranes are warranted to perform for 20 years. At year 20, the coating will be evaluated by the State of Utah preventative maintenance program to determine condition. The roofing manufacturer is responsible to repair or replace nonperforming L.A.M. to satisfy the balance of the roofing warranty.

6. Sealants and Adhesives:

a. Sealants and adhesives used to adhere and seal membrane and fabricated metal flashing etc. shall be included in the State of Utah (DFCM) roofing warranty.

Primer maybe required to enhance adhesion.

b. At the minimum, flashing sealants shall be polyurethane based.

c. Note: Sealants are required to perform for 20 years. At year 20, the sealant will be evaluated by the State of Utah preventative maintenance program to determine sealant condition. The roofing manufacturer is responsible to repair or replace nonperforming sealants to satisfy the balance of the roofing warranty.

d. Adhesives shall comply with State of Utah and local VOC ordinances. Adhesive shall include the following:

1) Solvent based reactive adhesives.

2) Latex/water based single application adhesives.

3) Prefabricated sheet adhesives.

4) Kynar/Hylar surfaced metal adhesives.

F. Vapor Retarder:

1. 31 mil minimum reinforced SBS asphalt-based retarder with primer, seaming and attachment accessories. Viable as a temporary roof for a period up to 60 days.

2. SBS rubberized asphalt membrane acceptable to the State of Utah and warranted as part of the roofing manufacturer’s system warranty including the following membrane options:

3. Hot/Cold Asphalt adhesive applied retarder with primer, seaming and attachment accessories. Viable as a temporary roof for a period up to 6 months.

2.4 PARAPET WALL SHEATHING

A. Products listed below must be compatible and provided by roofing manufacturer:

B. Parapet Wall Sheathing: Primed Fiber-reinforced gypsum panels, ASTM C1278/C1278M, Type X fire-resistant type. Or primed glass mat faced gypsum panels, ASTM C1177/C1177M fire resistant type. Thickness shall be [1/4] [1/2] 5/8] inch thick.

1. Supplied and warranted by roofing manufacturer.

a. Substitutions: See Section 01 6000 - Product Requirements.

2.5 ROOF COVERBOARD

A. Cover Board: Glass mat faced gypsum panels, ASTM C1177/C1177M, fire resistant type, [1/2] [5/8] inch thick.

1. Supplied and warranted by roofing manufacturer.

a. Substitutions: See Section 01 6000 - Product Requirements.

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2.6 INSULATION

A. Polyisocyanurate (ISO) Board Insulation: Rigid cellular foam, complying with ASTM C1289.

1. Classifications:

a. Type II: Faced with either cellulosic facers or glass fiber mat facers on both major surfaces of the core foam.

1) Class 1 - Faced with glass fiber reinforced cellulosic facers on both major surfaces of the core foam.

2) Compressive Strength: Classes 1-2-3, Grade 2 - 20 psi (138 kPa), minimum.

3) Thermal Resistance, R-value: At 1-1/2 inches thick; Class 1, Grades 1-2-3,

8.4 (1.48), minimum, at 75 degrees F.

2. Board Size: 48 by 96 inch.

3. Thermal Resistance: R-value of 5.7 per inch, aged value shall be based upon 15-year time weighted average LTTR (long term thermal resistance).

4. Board Thickness per layer: 2.7 inches maximum thickness.

5. Board Edges: Square.

6. Products:

a. Supplied and warranted by membrane manufacturer.

B. Extruded/Expanded Polystyrene Board Insulation Crickets (as required by Architect): ASTM C578, Type IV; Extruded/Expanded polystyrene board with natural skin surfaces; with the following characteristics:

1. Board Size: 48 by 96 inches.

2. Weight: 1.25 lb minimum compressive strength.

3. Slope: Minimum of ¼ inch per foot finished slope. Drain sumps shall be a minimum of ½ inch per foot.

4. Board Edges: Square.

2.7 ACCESSORIES

A. Roofing Expansion Joint Flashing:

1. Same material as membrane or as recommended by roofing manufacturer.

2. Emseal or equal.

B. Stack Boots: Prefabricated flexible boot and collar for pipe stacks through membrane; same material as roof membrane.

C. Insulation Joint Tape: Glass fiber reinforced type as recommended by insulation manufacturer, compatible with roofing materials; 6 inches wide; self-adhering.

D. Insulation Fasteners: Appropriate for purpose intended and approved by roofing manufacturer.

1. Length as required for thickness of insulation material and penetration of deck substrate, with metal plates.

E. Surface Conditioner/Primer for Adhesives and Sealants: Compatible with membrane and adhesives.

F. Thinners and Cleaners: As recommended by adhesive manufacturer, compatible with membrane.

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G. Insulation Adhesive: As recommended by insulation manufacturer.

H. Sealants: As recommended by membrane manufacturer.

I. Walkway Pads: Suitable for maintenance traffic, contrasting color or otherwise visually distinctive from roof membrane.

1. Composition: Roofing membrane manufacturer's standard.

2. Optional Product: Crossgrip Walkway: Plastex Inc. as purchased through and warranted by the membrane manufacturer.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Verify that surfaces and site conditions are ready to receive work.

B. Verify deck is supported and secure.

C. Verify deck is clean and smooth, flat, free of depressions, waves, or projections, properly sloped and suitable for installation of roof system.

D. Verify deck surfaces are dry and free of snow or ice.

E. Verify that roof openings, curbs, and penetrations through roof are solidly set, and nailing strips are in place.

3.2 INSTALLATION, GENERAL

A. Perform work in accordance with manufacturer's instructions, NRCA (RM), and NRCA (WM) applicable requirements.

B. Do not apply roofing membrane during cold or wet weather conditions unless approved by Owner and membrane manufacturer.

C. Do not apply roofing membrane when ambient temperature is outside the temperature range recommended by manufacturer.

D. Do not apply roofing membrane to damp or frozen deck surface or when precipitation is expected or occurring.

E. Do not expose materials vulnerable to water or sun damage in quantities greater than can be weatherproofed the same day.

3.3 INSTALLATION - VAPOR RETARDER AND INSULATION, UNDER MEMBRANE

A. Install vapor retarder to deck surface in accordance with manufacturer's instructions.

1. Extend vapor retarder under blocking to deck edge.

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2. In a fluted metal roof deck application using a film or self-adhered retarder, install a sheet metal support strap over deck in areas where vapor retarder termination edge and seams might sag down into decking flutes.

3. Install flexible flashing from vapor retarder to air seal material of wall construction, lap and seal to provide continuity of the air barrier.

4. If retarder will not be covered immediately, or as used as a temporary roof, all cut edges and terminations shall be sealed with a compatible mastic.

B. Attachment of Insulation:

1. Mechanically fasten insulation to deck in accordance with roofing manufacturer's instructions and FM DS 1-28 Factory Mutual requirements.

C. Lay subsequent layers of insulation with joints staggered minimum 6 inches from joints of preceding layer.

D. Place tapered insulation to the required slope pattern in accordance with manufacturer's instructions. If XPS/EPS insulation is used for the slope, it shall not come in direct contact with roof membrane.

E. On metal deck, place boards parallel to flutes with insulation board edges bearing on deck flutes.

F. Lay boards with edges in moderate contact without forcing. Cut insulation to fit neatly to perimeter blocking and around penetrations through roof.

G. Tape joints of insulation in accordance with roofing and insulation manufacturers' instructions.

H. At roof drains, use factory tapered Polyiso boards to slope down to roof drains over 18 inches.

Polystyrene boards are not acceptable in a drain sump.

I. Do not install more insulation than can be covered with cover board and membrane in same work period.

3.4 COVER BOARD APPLICATION

A. Refer to roof system manufacturer's written instructions for proper installation techniques.

B. Install approved fasteners with plates into the roof boards, flush with the surface. Fasteners should be installed in strict compliance with the roof system manufacturer’s installation recommendations and FM DS 1-29 Loss Prevention Data Sheet. Proper fastener spacing is essential to achieve wind-uplift performance.

C. Locate edge joints on, and parallel to, deck ribs. Stagger end joints of adjacent lengths of roof boards. Butt board edges and ends loosely in typical installations. Long, uninterrupted runs (greater than 200 feet) of roof boards may require slight gaping due to thermal expansion.

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3.5 PARAPET WALL SHEATHING APPLICATION

A. Refer to roof system manufacturer's written instructions for proper installation techniques.

B. Use appropriate corrosion-resistant fasteners as defined by roof system manufacturer.

C. Fasten a maximum 8 inches (200 mm) on center around the perimeter and 8 inches (200 mm) on center on framing members in the field of the panel. Minimum fastener penetration in steel framing is 3/8 inch (10 mm). Note: Tall parapets that require intermediate fastening shall have a ribbon of 6” wide, 20-gauge galvanized sheet metal installed to the steel framing at the same level as the intermediate fastening to ensure adequate fastener attachment strength prior to installing sheathing.

3.6 INSTALLATION – MEMBRANE

A. Apply membrane according to manufacturer's instructions.

B. Roll out membrane, free from wrinkles or tears. Place sheet into place without stretching.

C. Shingle joints on sloped substrate in direction of drainage.

D. Membrane thicker than 60 mil., shall require all three way overlapping intersections such as T- Joints to have a membrane cover patch centered and welded to ensure keyways are completely sealed from potential moisture entry.

E. Overlap edges and ends and seal seams with a hot air weld, minimum overlap shall be 3 inches.

Seal permanently waterproof. Apply uniform bead of sealant if required by membrane manufacturer to cut edges.

F. At intersections with vertical surfaces:

1. Extend membrane up a minimum of 4 inches onto vertical surfaces.

2. Fully adhere flexible flashing over membrane and up to counterflashing height and at parapet wall up, across top and down minimum of 2 inches (50 mm) on opposite face.

G. At drip edge, extend membrane under drip edge and to the outside face of the wall.

1. Install in accordance with NRCA details and manufacturer’s instructions.

H. Around roof penetrations, seal flanges and flashings with flexible flashing.

1. Install in accordance with NRCA details and manufacturer’s instructions.

I. Install roofing expansion joints where indicated. Make joints watertight.

1. Install in accordance with NRCA details and manufacturer’s instructions.

J. Coordinate installation of roof drains and sumps and related flashings.

K. Coordinate installation of screws required for roofing and installation so as not to damage any interior mechanical, plumbing, electrical, etc. If damage does occur, Contractor shall repair and/or replace work as acceptable to the Architect at no additional cost to the Owner.

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L. Refer to details on drawings and manufacturer's standard details.

3.7 WALKWAY

A. Install walkways as per manufacturer's instructions. Space pad joints to permit drainage.

3.8 FIELD QUALITY CONTROL

A. See Section 01 4000 - Quality Requirements for additional requirements.

B. Owner will provide testing services, and Contractor to provide temporary construction and materials for testing in accordance with requirements.

C. Provide daily on-site attendance of roofing and insulation manufacturer's representative during installation of this work.

D. Final Roof Inspection: Arrange for roofing system manufacturer's technical personnel 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.

3.9 CLEANING

A. See Section 01 7000 - Execution and Closeout Requirements for additional requirements.

B. Remove installation markings from finished surfaces.

C. In areas where finished surfaces are soiled by work of this section, consult manufacturer of surfaces for cleaning advice and comply with their documented instructions.

D. Repair or replace defaced or damaged finishes caused by work of this section.

3.10 PROTECTION

A. Protect installed roofing and flashings from construction operations.

B. Where traffic must continue over finished roof membrane, protect surfaces using durable materials.

END OF SECTION 07 5400.20