Section07540 TPAMembraneRoofing.doc

Solicitation No.AG-95CV-S-09-0020 Recovery – Replace or Repair/Resurface Roofs, Main Bldg

(N.Wing), WAB, & Service Bldg, WRRC, Albany, CA

SECTION 07540 – TPA MEMBRANE ROOFING (Section applies only to WAB (Labs) roof)

PART 1 GENERAL

1.1

RELATED DOCUMENTS

A.

General provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

B.

“Supplemental Information – WAB (Labs) Roof” applies to this Section.

1.2

SUMMARY

A.

This Section includes the following:

1.

Adhered membrane roofing system.

2.

Roof insulation.

3.

Base flashings and details.

4.

Penetrations and projections.

5.

Miscellaneous details.

B.

Related Sections include the following:

1.

Section 06105 for wood nailers, curbs, and blocking.

2.

Section 07620 for flashings and counterflashings.

1.3

DEFINITIONS

A.

Roofing Terminology: Refer to ASTM D 1079 and glossary of NRCA's "The NRCA Roofing and Waterproofing Manual" for definition of terms related to roofing work in this Section.

B.

Design Uplift Pressure: The uplift pressure, calculated according to procedures in SPRI's "Wind Load Design Guide for Fully Adhered and Mechanically Fastened Roofing Systems," before multiplication by a safety factor.

C.

Factored Design Uplift Pressure: The uplift pressure, calculated according to procedures in SPRI's "Wind Load Design Guide for Fully Adhered and Mechanically Fastened Roofing Systems," after multiplication by a safety factor.

1.4

PERFORMANCE REQUIREMENTS

A.

General: Provide installed roofing membrane and base flashings that remain watertight; do not permit the passage of water; and resist specified uplift pressures, thermally induced movement, and exposure to weather without failure.

B.

Material Compatibility: Provide roofing materials that are compatible with one another under conditions of service and application required, as demonstrated by roofing membrane manufacturer based on testing and field experience.

C.

FMG Listing: Provide roofing membrane, base flashings, and component materials that comply with requirements in FMG 4450 and FMG 4470 as part of a membrane roofing system and that are listed in FMG's "Approval Guide" for Class 1 or noncombustible construction, as applicable. Identify materials with FMG markings.

1.

Fire/Windstorm Classification: Class 1A 90.

D.

Roofing System Design: Provide a membrane roofing system that is identical to systems that have been successfully tested by a qualified testing and inspecting agency to resist the factored design uplift pressures calculated according to SPRI's "Wind Load Design Guide for Fully Adhered and Mechanically Fastened Roofing Systems."

1.5

SUBMITTALS

A.

Product Data: Provide for each type of product indicated.

B.

Samples for Verification, for the following products:

1.

12-by-12-inch square of sheet roofing.

2.

12-by-12-inch square of roof insulation.

3.

Six insulation fasteners of each type, length, and finish.

C.

Installer Certificates: Signed by roofing system manufacturer, certifying that Installer is approved, authorized, or licensed by manufacturer to install roofing system.

D.

Qualification Data: For Installer and manufacturer.

E.

Product Test Reports: Based on evaluation of comprehensive tests performed by manufacturer and witnessed by a qualified testing agency, for components of roofing system.

F.

Research/Evaluation Reports: For components of membrane roofing system.

G.

Maintenance Data: For roofing system, include in maintenance manuals.

H.

Warranties: As specified in this Section. Provide 3ea. copies of unexecuted warranties for Government review and approval. Upon project Final Acceptance, provide 3ea. copies of executed warranties.

I.

Inspection Report: Copy of roofing system manufacturer's inspection report of completed roofing installation.

1.6

QUALITY ASSURANCE

A.

Installer Qualifications: A qualified firm that is approved, authorized, or licensed by roofing system manufacturer to install manufacturer's product and that is eligible to receive manufacturer's warranty.

B.

Manufacturer Qualifications: A qualified manufacturer that has UL listing, FMG approval for membrane 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 548.

D.

Source Limitations: Obtain components for membrane roofing system from roofing membrane manufacturer.

E.

Fire-Test-Response Characteristics: Provide membrane roofing materials with the fire-test-response characteristics indicated as determined by testing identical products per test method below by UL, FMG, 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.

Fire-Resistance Ratings: UL Class A, for fire-resistance-rated roof assemblies of which roofing system is a part.

F.

Pre-Installation Conference: Conduct conference at Project site. Review methods and procedures related to roofing system including, but not limited to, the following:

1.

Meet with Contracting Officer’s Representative (COR), 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.

2.

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

3.

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

4.

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

5.

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

6.

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

7.

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

8.

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

9.

Review roof observation and repair procedures after roofing installation.

10.

Document proceedings, including corrective measures and actions required, and furnish 3ea. copies of record to COR.

1.7

DELIVERY, STORAGE, AND HANDLING

A.

Deliver roofing materials to Project site in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, and directions for storing and mixing with other components.

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. Protect stored liquid material from direct sunlight.

1.

Discard and legally dispose of liquid material that cannot be applied within its stated shelf life.

C.

Protect roof insulation materials from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. Store in a dry location. 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 existing and forecasted weather conditions permit roofing system to be installed according to manufacturer's written instructions and warranty requirements.

1.9

WARRANTY

A.

Manufacturer’s Warranty: Manufacturer's standard form, without monetary limitation, in which manufacturer agrees to repair or replace components of membrane roofing system that fail in materials or workmanship within specified warranty period. Failure includes roof leaks.

1.

Special warranty includes roofing membrane, base flashings, roof insulation, fasteners, and other components of membrane roofing system.

2.

Warranty Period: 20 years from date of Government Final Acceptance.

B.

Installer’s Warranty: Submit roofing Installer's warranty, on warranty form at end of this Section, signed by Installer, covering Work of this Section, including all components of membrane roofing system such as roofing membrane, base flashings, roof insulation, fasteners, and walkway products, for the following warranty period:

1.

Warranty Period: Two (2) years from date of Government Final Acceptance.

PART 2 - PRODUCTS

2.1

MANUFACTURERS

A.

In other Part 2 articles where titles below introduce lists, the following requirements apply for product selection:

1.

Manufacturers: Subject to compliance with requirements, provide products by the manufacturers specified (or Government approved equal).

2.

Tremco, Inc. or Government approved equal, based on product performance, warranty terms, and regulatory requirements.

2.2

TPA ROOFING MEMBRANE

A.

Fabric-Reinforced TPA Sheet: Uniform, flexible sheet formed from a thermoplastic fabric or scrim reinforced, and as follows:

1.

Thickness: 45 mils 2.

Exposed Face Color: White

3.

Physical Properties:

a.

Tensile Strength: 350 lbf ASTM D 751, grab method.

b.

Elongation at Break: 40 percent; ASTM D 751.

c.

Tearing Strength: 100 lbf minimum; ASTM D 751, Procedure B.

d.

Brittleness Point: Minus 22 deg F.

e.

Ozone Resistance: No cracks after sample, wrapped around a 3-inch-diameter mandrel, is exposed for 166 hours to a temperature of 104 deg F and an ozone level of 100 pphm; ASTM D 1149.

f.

Resistance to Heat Aging: 90 percent minimum retention of breaking strength, elongation at break, and tearing strength after 166 hours at 240 deg F; ASTM D 573.

g.

Water Absorption: Less than 4 percent mass change after 166 hours' immersion at 158 deg F; ASTM D 471.

h.

Linear Dimension Change: Plus or minus 2 percent; ASTM D 1204.

2.3

AUXILIARY MATERIALS

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 standard sheet flashing of same material, type, reinforcement, thickness, and color as PVC sheet membrane.

C.

Sheet Flashing: Manufacturer's standard unreinforced thermoplastic sheet flashing, 55 mils thick, minimum, of same color as sheet membrane.

D.

Bonding Adhesive: Manufacturer's standard water-based bonding adhesive for membrane, and solvent-based bonding adhesive for base flashings.

E.

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

F.

Metal Termination Bars: Manufacturer's standard predrilled stainless-steel or aluminum bars, approximately 1 by 1/8 inch thick; with anchors.

G.

Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening membrane to substrate, and acceptable to membrane roofing system manufacturer.

H.

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

2.4

ROOF INSULATION

A.

General: Provide 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, felt or glass-fiber mat facer on both major surfaces; one (1) inch in thickness.

C.

Fiberboard: ASTM C208, Type II, Grade 2; ½ inch in thickness.

D.

Provide preformed saddles, crickets, tapered edge strips, and other insulation shapes as required for sloping to drain. Provide sump at each drain location.

2.5

INSULATION ACCESSORIES

A.

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

B.

Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening roof insulation to substrate, and acceptable to roofing system manufacturer.

C.

Cold Fluid-Applied Adhesive: Manufacturer's standard cold fluid-applied adhesive formulated to adhere roof insulation to substrate.

2.6

WALKWAYS

A.

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

PART 3 - EXECUTION

3.1

EXAMINATION

A.

Examine substrates, areas, and conditions, with Installer present, for compliance with the following requirements and other conditions affecting performance of roofing system:

1.

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

2.

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

3.2

PREPARATION

A.

Clean substrate of dust, debris, moisture, and other substances detrimental to roofing installation according to roofing system manufacturer's written instructions. Remove sharp projections.

B.

Prevent materials from entering and clogging roof drains and conductors and from spilling or migrating onto adjacent surfaces. Remove roof-drain plugs when no work is taking place or when rain is forecast.

C.

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

3.3

INSULATION INSTALLATION

A.

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

B.

Comply with membrane roofing system manufacturer's written instructions for installing roof insulation.

C.

Install one or more layers of insulation under area of roofing to achieve required thickness. Where overall insulation thickness is 1-1/2 inches or greater, install 2 or more layers with joints of each succeeding layer staggered from joints of previous layer a minimum of 6 inches in each direction.

D.

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

E.

Install insulation with long joints of insulation in a continuous straight line with end joints staggered between rows, abutting edges and ends between boards. Fill gaps exceeding 1/4 inch with insulation.

1.

Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations.

F.

Adhered Insulation: Install each layer of insulation and adhere to substrate as follows:

1.

Prime surface of concrete deck with asphalt primer at a rate of 3/4 gal./100 sq. ft. and allow primer to dry.

2.

Set each layer of insulation in a cold fluid-applied adhesive.

G.

Install cover boards over insulation with long joints in continuous straight lines with end joints staggered between rows. Stagger joints from joints in insulation below a minimum of 6 inches in each direction. Loosely butt cover boards together and fasten to roof deck.

1.

Fasten according to requirements in FMG's "Approval Guide" for specified Windstorm Resistance Classification.

2.

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

3.4

ADHERED ROOFING MEMBRANE INSTALLATION

A.

Install roofing membrane over area to receive roofing according to membrane roofing system manufacturer's written instructions. Unroll roofing membrane and allow to relax before installing.

1.

Install sheet according to ASTM D 5036.

B.

Start installation of roofing membrane in presence of membrane roofing system manufacturer's technical personnel.

C.

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

D.

Bonding Adhesive: Apply water-based bonding adhesive to substrate at rate required by manufacturer and immediately install roofing membrane. Do not apply bonding adhesive to splice area of roofing membrane.

E.

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

F.

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

G.

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.

3.

Repair tears, voids, and lapped seams in roofing membrane that does not meet requirements.

H.

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

I.

Install roofing membrane and auxiliary materials to tie in to existing roofing.

3.5

BASE FLASHING INSTALLATION

A.

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

B.

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

C.

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

D.

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

E.

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

F.

Walls: Fully adhere membrane to walls in adhesive. Terminate top of sheet to wall with termination bar fastened eight (8) inches O.C. Furnish and install new twenty four (24) gauge skirt flashing and slip up under interior and fasten twelve (12) inches O.C.

G.

Gravelstop: Furnish and install twenty two (22) gauge continuous cleat. Fabricate and install twenty four (24) gauge coated metal. Fasten three (3) inches O.C. staggered. Strip into field of membrane with stripping ply, heat welded.

H.

Sleepers: Furnish and install new sleepers, set on walk pads.

I.

Duct bases: Furnish and install new base flashings at all ducting bases and mechanically attach top of sheet, directly below clip, fastened eight (8) inches O.C.

J.

Curbs: Open corners neatly, install new base flashings, fully adhered and fasten top of sheet at highest point. Close corners to original position and pop rivet, two (2) per corner.

K.

Drains: Target un-reinforced sheet directly over drain and adhere directly to immediate drain area. Seal to drain with waterstop as needed. Furnish and install field membrane sheet into drain bowl, set clamping ring in flashing tape of waterstop, and secure. Re-install strainer.

L.

Duct legs: Furnish and install flexible membrane boot around base of leg support, clamp and caulk to seal.

3.6

WALKWAY INSTALLATION

A.

Flexible Walkways: Provide walkways from access doors to and around each HVAC unit. (Estimated quantity of walkways is 300 lineal feet.)

3.7

FIELD QUALITY CONTROL

A.

Testing Agency: Government may engage a qualified independent testing and inspecting agency to perform roof tests and inspections and to prepare test reports.

B.

Final Roof Inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation upon completion and submit report to COR.

1.

Notify COR in writing a minimum of 5 work days in advance of date and time of inspection.

C.

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

3.8

PROTECTING AND CLEANING

A.

Protect membrane roofing system from damage and wear during construction period. When remaining roofing work will not affect or endanger completed roofing work, inspect completed roofing work for deterioration and damage, describing its nature and extent in a written report, with 3ea. copies to COR.

B.

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

C.

Clean overspray and spillage from adjacent surfaces using cleaning agents and procedures compatible with the affected surfaces.

3.9

ROOFING INSTALLER'S WARRANTY

A.

WHEREAS <Insert name> of <Insert address>, herein called the "Roofing Installer," has performed roofing and associated work ("work") on the following project:

1.

Owner: <Insert name of Owner.>

2.

Address: <Insert address.>

3.

Building Name/Type: <Insert information.>

4.

Address: <Insert address.>

5.

Area of Work: <Insert information.>

6.

Final Acceptance Date: <Insert date.>

7.

Warranty Period: <Insert time.>

8.

Expiration Date: <Insert date.>

B.

AND WHEREAS Roofing Installer has contracted (either directly with Government or indirectly as a subcontractor) to warrant said work against leaks and faulty or defective materials and workmanship for designated Warranty Period.

C.

NOW THEREFORE Roofing Installer hereby warrants, subject to terms and conditions herein set forth, that during Warranty Period he will, at his own cost and expense, make or cause to be made such repairs to or replacements of said work as are necessary to correct faulty and defective work and as are necessary to maintain said work in a watertight condition.

D.

This Warranty is made subject to the following terms and conditions:

1.

Specifically excluded from this Warranty are damages to work and other parts of the building, and to building contents, caused by:

a.

lightning;

b.

peak gust wind speed exceeding 74 mph;

c.

fire;

d.

failure of roofing system substrate, including cracking, settlement, excessive deflection, deterioration, and decomposition;

e.

faulty construction of parapet walls, copings, vents, equipment supports, and other edge conditions and penetrations of the work;

f.

vapor condensation on bottom of roofing; and g.

activity on roofing by others, including construction contractors, maintenance personnel, other persons, and animals, whether authorized or unauthorized by Government.

2.

When work has been damaged by any of the foregoing causes, Warranty shall be null and void until such damage has been repaired by Government.

3.

Roofing Installer is responsible for damage to work covered by this Warranty, and is liable for consequential damages to building and to building contents resulting from leaks or faults or defects of work, except as excluded herein.

4.

During Warranty Period, if Government allows alteration of work by anyone other than Roofing Installer (or authorized agent thereof), including cutting, patching, and maintenance in connection with penetrations, attachment of other work, and positioning of anything on roof, this Warranty shall become null and void on date of said alterations, but only to the extent said alterations affect work covered by this Warranty. If Government engages Roofing Installer (or authorized agent thereof) to perform said alterations, Warranty shall not become null and void unless Roofing Installer (or authorized agent thereof), before starting said work, shall have notified Government in writing, showing reasonable cause for claim, that said alterations would likely damage or deteriorate work, thereby reasonably justifying a limitation or termination of this Warranty.

5.

During Warranty Period, if original use of roof is changed and it becomes used for, but was not originally specified for, a promenade, work deck, spray-cooled surface, flooded basin, or other use or service more severe than originally specified, this Warranty shall become null and void on date of said change, but only to the extent said change affects work covered by this Warranty.

6.

Government shall promptly notify Roofing Installer of observed, known, or suspected leaks, defects, or deterioration and shall afford reasonable opportunity for Roofing Installer to inspect work and to examine evidence of such leaks, defects, or deterioration.

7.

This Warranty is recognized to be the only warranty of Roofing Installer on said work and shall not operate to restrict or cut off Government from other remedies and resources lawfully available to Government in cases of roofing failure. Specifically, this Warranty shall not operate to relieve Roofing Installer of responsibility for performance of original work according to requirements of the Contract Documents, regardless of whether Contract was a contract directly with Government or a subcontract with Government's General Contractor.

E.

IN WITNESS THEREOF, this instrument has been duly executed this <Insert day> day of <Insert month>, <Insert year>.

1.

Authorized Signature: <Insert signature.>

2.

Name: <Insert name.>

3.

Title: <Insert title.>

END OF SECTION 07540

TPA MEMBRANE ROOFING 07540 - 1

(Section applies only to WAB (Labs) roof)