075423 Thermoplastic Tri-Polymer Alloy TPA Roofing

BUFFALO ZOO
ARCTIC EDGE EXHIBIT
F/A PROJECT #10029

SECTION 075423 - THERMOPLASTIC TRI-POLYMER ALLOY (TPA) ROOFING

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. Adhered TPA membrane roofing system, cold applied.
2. Adhered roof insulation and cover board, cold-applied.
3. Vapor retarder, cold applied.

B. Related Sections:

1. Section 061053 "Miscellaneous Rough Carpentry" for wood nailers, curbs, and blocking.
2. Section 079200 "Joint Sealants" for joint sealants, joint fillers, and joint preparation.
3. Section 077100 "Roof Specialties" for manufactured copings, raised metal edge, draining

metal edge and other metal flashing components.
4. Section 221423 "Storm Drainage Piping Specialties" for roof drains.

1.3 DEFINITIONS

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

1.4 PERFORMANCE REQUIREMENTS

A. General Performance: Installed membrane roofing and base flashings shall withstand specified
uplift pressures, thermally induced movement, and exposure to weather without failure due to
defective manufacture, fabrication, installation, or other defects in construction. Membrane
roofing and base flashings shall remain watertight.

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

C. FM Approvals Listing: Provide membrane roofing, base flashings, and component materials
that comply with requirements in FM Approvals 4450 and FM Approvals 4470 as part of a
membrane roofing system, and that are listed in FM Approvals' "RoofNav" for Class 1 or
noncombustible construction, as applicable.

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1. Fire/Windstorm Classification: Class 1A-90.

D. Flashings: Provide base flashings, perimeter flashings, detail flashings and component materials
that comply with requirements and recommendations of the following:

1. FMG 1-49 Loss Prevention Data Sheet for Perimeter Flashings.
2. NRCA Roofing and Waterproofing Manual (Fifth Edition) for construction details and

recommendations.
3. SMACNA Architectural Sheet Metal Manual (Fifth Edition) for construction details.
4. The metal edge securement, except gutter, shall be installed as tested in accordance with

the most current version of the ANSI\SPRI ES-1, American National Standard for Edge
Systems Used with Low-Slope Roofing Systems.

E. Solar Reflectance Index: Not less than 78 when calculated according to ASTM E 1980, based
on testing identical products by a qualified testing agency.

F. Energy Performance: Provide roofing system that is listed on the DOE's ENERGY STAR "Roof
Products Qualified Product List" for low-slope roof products.

1.5 ACTION SUBMITTALS

A. Product Data: For each type of product indicated.

B. Shop Drawings: For roofing system. Include plans, elevations, sections, details, and attachments
to other work.

1. Base flashings and membrane terminations.
2. Tapered insulation, including slopes.

C. Samples for Verification: For the following products:

1. Sheet roofing, of color specified.
2. Roof insulation.
3. Trilaminate vapor barrier ply.
4. Walkway pads or rolls.

1.6 INFORMATIONAL SUBMITTALS

A. Qualification Data: For qualified Installer and manufacturer.

B. Manufacturer Certificates: Signed by roofing manufacturer certifying that roofing system
complies with requirements specified in "Performance Requirements" Article.

1. Submit current FM 1A-90 Approval Assembly as evidence of compliance with
performance requirements. List any deviations from published assembly.

C. Qualification Data: For manufacturer’s technical representative.

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D. Warranties: Sample of manufacturer’s and contractor's warranties as specified.

E. Inspection Reports: Provide copies of the roofing system manufacturer’s inspection photo
reports noted during and at the completion of the new roof installation. Manufacturer’s
Technical (non-sales) Representative must inspect conventional roof installation every other day
and report progress to Owner’s representative. Provide progress photos for application of each
operation of roofing system. In addition to regular inspections, Manufacturer’s Technical (non-
sales) Representative shall be present for roof work starts at each section. Manufacturer’s
Technical Representative shall provide proof of no less than 10 years experience in the Roofing
Industry.

1.7 CLOSEOUT SUBMITTALS

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

1.8 QUALITY ASSURANCE

A. Installer Qualifications: Engage an experienced installer to perform Work of this Section who
has specialized in installing cold process roofing systems; who is approved, authorized, or
licensed by the roofing system manufacturer to install manufacturer’s product; and who is
eligible to receive and issue the standard roofing manufacturer’s warranty. APPLICATORS TO
INCLUDE A LIST OF FIVE (5) COLD-APPLIED ROOFING PROJECTS COMPLETED
WITHIN THE LAST 5 YEARS WITH THE SUBMITTED MANUFACTURER, OF SIMILAR
SIZE, AND WITHIN 50 MILES OF PROJECT SITE. MUST INCLUDE NAMES AND
ADDRESSES OF ARCHITECTS AND OWNERS, AND OTHER INFORMATION WITH
BID.

B. Roofing Inspector Qualifications: A technical representative of manufacturer not engaged in
the sale of products and experienced in the installation and maintenance of the specified roofing
system, qualified to perform roofing observation and inspection specified in Field Quality
Control Article, to determine Installer’s compliance with the requirements of this Project, and
approved by the manufacturer to issue warranty certification.

1. The Roofing Inspector shall be one of the following:
a. An authorized full-time technical employee of the manufacturer with 10 years
experience in commercial roofing.
b. If manufacturer does not employ full time technical personnel, inspection
personnel shall be certified as a Registered Roof Observer by the Roof Consultants
Institute, and shall be experienced in the installation and maintenance of the
specified roofing system and qualified to determine Installer’s compliance with the
requirements of this Project.

C. Source Limitations: Obtain roofing system components from or approved in writing by roofing
system manufacturer.

D. Exterior Fire-Test Exposure: ASTM E 108, Class A; for application and roof slopes indicated,
as determined by testing identical membrane roofing materials by a qualified testing agency.
Materials shall be identified with appropriate markings of applicable testing agency.

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E. Pre-installation Roofing Conference: Conduct conference at Project site.

1. Meet with Owner, Architect, inspecting agency representative, roofing Installer, roofing
system manufacturer's representative, and installers whose work interfaces with or affects
roofing, including installers of roof accessories and roof-mounted equipment.

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 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.

1.9 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, approval or
listing agency markings, 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.

1.10 PROJECT CONDITIONS

A. Environmental Limitations: Apply roofing within the range of ambient and substrate
temperatures recommended by roofing system manufacturer. Do not apply roofing to a damp or
wet substrate or when temperature is below 45 degrees F.

1. Do not apply roofing in snow, rain, fog, or mist.
2. Do not apply any roofing materials during inclement weather.

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3. Comply with manufacturer's recommendations for minimum and maximum temperatures
and humidity during application.

4. Consider effects of wind chill on adhesives, and ensure they will not prematurely set
before proper adhesion takes place.

5. Keep water-based Products from freezing. Do not apply if temperatures are below 45
degrees F.

1.11 WARRANTY

A. Warranty, General: Warranties specified shall be in addition to, and run concurrent with, other
warranties required by the Contract Documents. Manufacturer's disclaimers and limitations on
product warranties do not relieve Contractor of obligations under requirements of the Contract
Documents.

B. Manufacturer’s Roofing Warranty: Submit a written warranty, signed by the roofing system
manufacturer agreeing to promptly repair any leaks in the roof membrane system resulting from
defects in materials or workmanship including, but not limited to, roof membrane, base
flashings, roof insulations, wood components, fasteners, and all roof system metal components
for the indicated warranty period.

1. Manufacturer’s 20-Year Systems Warranty.
2. Indicate a wind speed warranty of 74 M.P.H., as reported by the certified weather

reporting station nearest to the site for the Buffalo N.Y. region. Provide a sample copy of
standard roofing manufacturer’s warranty, stating obligations, remedies, limitations, and
exclusions of warranty.
3. BIDDERS TO PROVIDE COPY OF MANUFACTURER’S WARRANTY WITH BID.
Failure to submit manufacturer’s warranty at time of bid shall be considered grounds for
rejection of bid.
4. Warranty shall run for a continuous 20 years.
5. Warranty will not be accepted that contains any requirement(s) for Owner to renew the
warranty at any time during the 20 year period.
6. In year(s) number 2, 5, and 10 of this warranty, manufacturer shall provide roof
inspections, and limited housekeeping services, at no additional charge.
7. Upon successful completion of the work and prior to receipt of final payment, the
manufacturer’s warranty as stated above shall be issued to the Owner.

C. Applicator/Roofing Contractor Warranty: Submit roofing installer’s written warranty, signed
by the installer, covering work of this section, including but not limited to, roof membrane,
insulation layers, base flashings, roof insulations, wood components, fasteners, and all roof
system metal components for two years from the date of substantial completion. The warranty
shall guarantee material and workmanship for watertightness, and against all leaks. During the
two-year period, the contractor shall respond and fix all reported leaks within 24 hours from
time of notification, and fix all leaks without any cost to the Owner.

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PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Basis-of-Design Manufacturer/Product: The roof system specified in this Section is based upon
Tremco, Inc. products named in other Part 2 articles. Subject to compliance with requirements,
provide the named product by one of the following:

1. Tremco, Inc.
2. Commercial Innovations
3. Ecology Roof Systems

B. Approved Manufacturer’s white thermoplastic TPA/KEE roofing membrane, fleece-backed, 60
mil thickness:

1. Manufacturer / White Thermoplastic Roofing Membrane / Adhesive:

a. Tremco Inc. / Tremco TPA FB 60 mil / Fleece Backed WB Single Ply Bonding
Adhesive

b. Commercial Innovations / SolarBrite FB 60 mil / SolarBrite FBWB Bonding
Adhesive

c. Ecology Roof Systems / ERS-8000 60 mil / ERS-8002 Adhesive

C. Approved Manufacturer’s trilaminate Vapor Barrier Ply Sheet and Cold Adhesive:

1. Manufacturer / Vapor Barrier Ply Sheet / Cold Adhesive:

a. Tremco Inc. / BURmastic Composite Ply HT / BURmastic Adhesive
b. Ecology Roofing Systems / ERS-408 / ERS-CP Adhesive FM
c. Garland Co. / HPR TriBase Premium / Weatherking Adhesive

2.2 AUXILIARY MEMBRANE ROOFING MATERIALS

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

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

2. Adhesives and sealants that are not on the exterior side of weather barrier shall comply
with the following limits for VOC content when calculated according to 40 CFR 59,
Subpart D (EPA Method 24):

a. Plastic Foam Adhesives: 50 g/L.
b. Gypsum Board and Panel Adhesives: 50 g/L.
c. Multipurpose Construction Adhesives: 70 g/L.
d. Fiberglass Adhesives: 80 g/L.
e. Single-Ply Roof Membrane Adhesives: 250 g/L.
f. Other Adhesives: 250 g/L.
g. Single-Ply Roof Membrane Sealants: 450 g/L.

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h. Nonmembrane Roof Sealants: 300 g/L.
i. Sealant Primers for Nonporous Substrates: 250 g/L.
j. Sealant Primers for Porous Substrates: 775 g/L.

3. Adhesives and sealants that are not on the exterior side of weather barrier shall comply
with the testing and product requirements of the California Department of Health
Services' "Standard Practice for the Testing of Volatile Organic Emissions from Various
Sources Using Small-Scale Environmental Chambers."

B. Trilaminate Reinforced Ply Sheets: Non-perforated, asphalt-coated,
fiberglass/fiberglass/polyester or polyester/fiberglass/polyester reinforced flashing sheet dusted
with fine mineral surfacing on both sides, with the following minimum properties per ASTM
D5147:

1. Basis of Design: Tremco, BURmastic Composite Ply HT.
2. Tensile Strength, minimum, ASTM D 5147: machine direction, 140 lbf/in; cross machine

direction, 130 lbf/in.
3. Tear Strength, minimum, ASTM D 5147: machine direction, 210 lbf; cross machine

direction, 185 lbf.
4. Elongation at 77 deg. F, minimum, ASTM D 5147: machine direction, 6 percent; cross

machine direction, 6 percent.
5. Thickness, minimum, ASTM D 146: 55 mils.

C. Asphalt Roofing Mastic: ASTM D 4586, Type II, Class 1, one-part, asbestos-free, cold-applied
mastic specially formulated for compatibility and use with specified vapor barrier.

D. Asphalt Primer: Low-VOC, water-based, polymer modified asphalt primer with the following
physical properties:

1. Asbestos Content, EPA 600/R13/116: None.
2. Volatile Organic Compounds (VOC), maximum, ASTM D 3960: 2 g/L.

E. Gasket Sealant Tape: Two sided, butyl adhesive, 1” x 1/8 compression tape for termination
bars.

F. Pitch Pocket mastic: TremSeal Pitch Pocket Sealer, or approved equal product.

G. Sheet Flashing: Manufacturer's standard TPA/KEE sheet flashing of same material, type,
reinforcement, 60 mil thickness, and color as thermoplastic sheet membrane. Non-fleece-backed
membrane for flashings.

H. Drain Flashing: Manufacturer’s non-reinforced TPA/KEE membrane, 55 mil thickness, for use
at drains.

I. Thermoplastic Membrane: Thermoplastic TPA/KEE membrane sheeting shall have a maximum
roll width of 76 inches.

J. Bonding Adhesive: Manufacturer's standard VOC-compliant water-based bonding adhesive for
use at fleece backed membrane. Manufacturer’s standard VOC-compliant bonding adhesive for
use at flashing locations.

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K. Cover Strip: Manufacturer’s 6 inch wide self adhering TPA/KEE membrane cover strip.

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

M. Fasteners: Factory-coated steel fasteners and metal plates complying with corrosion-resistance
provisions in FM Approvals 4470, designed for fastening membrane to substrate, and
acceptable to membrane roofing system manufacturer.

N. Miscellaneous Accessories: Provide compatible pourable sealers, water block sealants,
preformed TPA/KEE cone and vent sheet flashings, preformed inside and outside corner sheet
flashings, T-joint covers, sealants and other accessories as required by roofing manufacturer.

2.3 ROOF INSULATION

A. General: Preformed roof insulation boards approved by roofing membrane manufacturer,
selected from manufacturer's standard sizes suitable for application, of thicknesses indicated.

B. Polyisocyanurate Board Insulation: ASTM C 1289, Type II, Class 1, Grade 2, HCFC-free, with
felt or glass-fiber mat facer on both major surfaces.

C. Tapered insulation shall provide a slope of minimum 1/4 inches in 12 inches.

D. Provide tapered insulation and R-Value as indicated on drawings.

E. Provide preformed saddles, crickets, tapered edge strips, and other insulation shapes where
indicated for sloping to drain. Fabricate crickets to ½:12 slopes.

F. Insulation Adhesive: Solvent-free, non-foamed, cold fluid-applied, asphaltic-urethane adhesive
formulated to adhere roof insulation to substrate. Two-part and foamed adhesives are not
permitted.

G. Furnish roof insulation accessories recommended by insulation manufacturer for intended use
and compatibility with membrane roofing.

2.4 COVER BOARD

A. Cover Board: GP Gypsum Dens-Deck: ASTM C 1177, glass-mat, water-resistant gypsum
substrate, 1/2 inch thick, factory primed.

B. Cover Board Adhesive: Solvent-free, non-foamed, cold fluid-applied, asphaltic-urethane
adhesive formulated to adhere roof insulation to substrate. Two-part and foamed adhesives are
not permitted.

2.5 INSULATION ACCESSORIES

A. General: Furnish roof insulation accessories recommended by insulation manufacturer for
intended use and compatibility with membrane roofing.

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B. Modified Asphaltic Insulation Adhesive: Insulation manufacturer's specified modified asphalt,
asbestos-free, cold-applied adhesive formulated to attach roof insulation to substrate or to
another insulation layer.

C. Wood Nailers: Comply with recommendations in FMG Loss Prevention Data Sheet 1-49,
including requirements for wood nailers.

2.6 WALKWAYS

A. Thermoplastic Walkway Roll.

1. 80 mils thick minimum; Gray, non fleece-backed, 36” width, serrated/slip-resistant
surface.

2.7 METAL FLASHING MATERIALS

A. Other Metal Flashings:

1. Metal flashings, counter flashings, pitch pans, scuppers, and like applications shall be in
accordance with National Roofing Contractors Association (NRCA) guidelines and
roofing manufacturer’s requirements.

B. TPA-coated sheet metal for use with manufactured draining metal edge flashings:

1. 24 gauge galvanized, TPA/KEE-coated metal.
2. Color: White.

C. See Division 07 Section "Roof Specialties" for custom metal roof penetration flashings, metal
copings and counter flashings.

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 curbs are set and braced and
that roof drain bodies 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. Verify that minimum concrete drying period required by roofing system manufacturer
has passed.

4. Verify that concrete substrate is visibly dry and free of moisture. Test for capillary
moisture by plastic sheet method according to ASTM D 4263.

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

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6. To provide positive bond of roofing components: Ensure that grout is evenly applied and
no grout shall project 1/8" above the deck planks and no grout line shall be deeper than
1/8" below the deck plank surface.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

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 surfaces of other construction. 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.

D. All roof top curbs, units, projections and wall flashings must allow finish roof system flashing
height of 8” minimum.

E. Prime surface of concrete decks with asphalt primer at a rate of 1 gallon per 200 square feet and
allow primer to dry.

3.3 INSTALLATION, GENERAL

A. Unless noted otherwise, install modified bitumen membrane roofing system according to
roofing system manufacturer’s written instructions and applicable recommendations of NRCA
“Quality Control Recommendations for Single Ply Membrane Roofing.”

B. Comply with recommendations in FMG Loss Prevention Data Sheet 1-49.

C. Install roofing system in accordance with NRCA Manual Plates and NRCA recommendations;
modify as required to comply with requirements of FMG references above.

D. Begin the vapor barrier, insulation, cover board and roofing membrane system installation in the
presence of roofing manufacturer technical (non-sales) personnel.

E. Coordinate installation of roofing system components so insulation and roofing plies are not
exposed to moisture or remain exposed at the end of the workday or when rain is forecast.

F. Provide water cutoffs at the end of each day’s work to cover exposed ply sheets and insulation
with a course of coated felt with joints and edges sealed.

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

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H. Roofing system and building shall be weather-tight at the end of each working day.

I. Remove and discard temporary seals before beginning work on adjoining.

J. Install membrane with all laps shingled uniformly. Shingle in direction to shed water.

K. Cooperate with inspecting and testing agencies engaged or required to perform services for
installing modified bitumen membrane roofing system.

L. Cold Process Vapor Barrier Adhesive Heating: An in-line heat exchange unit, recommended by
the equipment manufacturer for cold process asphalt adhesive, may be used to facilitate
application.

1. Do not exceed the maximum adhesive temperature of 100 deg. F. Do not exceed the
flashpoint of the cold process adhesive.

2. Heat exchange unit is filled with heat transfer oil approved by equipment manufacturer.
3. Follow operation procedures as required by the equipment manufacturer.

M. Substrate-Joint Penetrations/Penetrations: Prevent adhesive from penetrating substrate joints,
entering building, or damaging roofing system components or adjacent building construction.

3.4 VAPOR-RETARDER INSTALLATION

A. Install 1 trilaminate vapor barrier ply sheet lapping each sheet minimum 4 inches over
preceding sheet in shingle fashion. Embed each sheet in a solid application of cold adhesive at
a minimum rate of 2.0 gallons per 100 square feet. Roll ply into adhesive with a 4 inch side lap
and 6 inch end lap minimum.

1. Broom ply into adhesive.
2. Turn ply up at penetrations, walls and curbed units a minimum of four inches (4”) and

seal with asphalt mastic.

B. Completely seal vapor barrier at terminations, obstructions, and penetrations to prevent air and
moisture movement into roofing system.

3.5 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 and insulation manufacturer's written instructions for
installing roof insulation.

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

D. Where insulation thickness is 2.7 inches or greater, install multiple layers to ensure no
individual layer is thicker than 2.7 inches, with joints of each succeeding layer staggered from
joints of previous layer a minimum of 6 inches in each direction.

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

F. Sump insulation surrounding drains to provide a 48" x 48" sump.

G. Install adhered crickets between drains.

H. 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 1/8 inch
with insulation.

1. Cut and fit insulation within 1/8 inch of nailers, projections, and penetrations.

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

1. Set each layer of insulation in ribbons of cold-applied asphaltic urethane insulation
adhesive, at a minimum rate of 1.50 gallons per 100 square feet, firmly pressing and
maintaining insulation in place.

2. Increase the adhesive application rate by 50% in the perimeters and 75% in the corners of
the roof as required to meet specified wind uplift requirements.

3.6 ADHERED MEMBRANE ROOFING INSTALLATION

A. Fully adhere membrane roofing over area to receive roofing and install according to roofing
system manufacturer's written instructions.

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

C. Mix bonding adhesive as required by manufacturer’s written instructions.

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

E. Bonding Adhesive: Apply to substrate at rate required by manufacturer and immediately install
fleece backed membrane roofing into wet adhesive. Do not allow adhesive to dry before
installing membrane. Ensure bonding adhesive does not contaminate TPA membrane surface or
lap and seam areas. Roll-in membrane roofing to ensure a positive bond.

F. In addition to adhering, mechanically fasten membrane roofing securely at vertical terminations
and penetrations 12 inches on center or more as required by manufacturer.

G. Turn membrane down over vertical blocking at perimeters and terminate membrane by
fastening 12 inches on center into wood blocking.

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

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I. Seams: Clean seam areas, overlap membrane roofing, and hot-air weld side and end laps of
membrane roofing and sheet flashings 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 sheet 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 that does not comply with requirements.

J. Extend drain membrane flashing a minimum 1 inch down into drain bowl. Spread a full bed of
compatible water block sealant bed over deck drain flange at roof drains and securely seal
adhered TPA/KEE drain membrane flashing in place with clamping ring. Heat weld drain
membrane flashing onto membrane roofing and seal edge with sealant.

3.7 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 flashing bonding adhesive to substrate and underside of sheet flashing at required rate to
completely bond flashing to substrate. Do not apply to seam area of flashing to allow for heat
welding at seams and laps. Firmly roll sheet flashings into the adhesive.

C. Extend adhered flashings six (6) inches onto membrane roofing and heat weld to field
membrane. Apply lap sealant to seal cut edges of sheet membrane.

D. Seams: Clean seam areas, overlap membrane flashing, and hot-air weld side and end laps of
membrane roofing and sheet flashings 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 sheet membrane.

2. Repair tears, voids, and lapped seams in roofing that does not comply with requirements.

E. Terminate and seal top of adhered sheet flashings and mechanically anchor to substrate 8” on
center through termination bars and a compression seal of butyl tape.

F. Cover flashing terminations with a metal counter flashing.

G. Use manufactured membrane corners for inside and outside base flashing corners.

3.8 WALKWAY INSTALLATION

A. Flexible Walkways: Install walkway roll products in locations indicated. Heat weld or adhere
to substrate with a compatible adhesive according to roofing system manufacturer's written
instructions.

THERMOPLASTIC TRI-POLYMER ALLOR (TPA) ROOFING 075423 - 13

BUFFALO ZOO
ARCTIC EDGE EXHIBIT
F/A PROJECT #10029

3.9 FIELD QUALITY CONTROL

A. Manufacturer’s Technical Representative must inspect roof installation every other day and
report progress to Owner’s representative.

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

1. Manufacture shall verify watertightness of roof system by performing a nondestructive
infrared moisture survey.

2. Notify Architect or Owner 48 hours in advance of date and time of final inspection.
3. Results will be made available to owner’s representative in written form. Any defects or

entrapped moisture found within the new roofing system installation will be removed and
replaced at the installing contractor’s expense.

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

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

3.10 PROTECTING AND CLEANING

A. Protect membrane roofing system from damage and wear during remainder of construction
period. When remaining construction will not affect or endanger roofing, inspect roofing for
deterioration and damage, describing its nature and extent in a written report, with copies to
Architect and Owner.

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 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

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