SECTION 07 57 00
SPRAYED POLYURETHANE FOAM ROOFING
Guideline Specification – Acrylic Elastomeric Roof Coating
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PART 1 GENERAL
1.1
1.2
SECTION INCLUDES
A.
Preparation of Substrate.
B.
Sprayed in-place Polyurethane Foam Insulation.
C.
Acrylic Elastomeric Roof Coating.
D.
Roofing Granules.
E.
Walkways.
RELATED SECTIONS
A.
Section 02 21 19 - Selective Demolition and Renovation Work
B.
Section ______ - ____________: Roof substrate.
C.
Section 07 59 00 - Membrane Roof Repairs
D.
Section 07 62 00 - Sheet Metal Flashing and Trim: Perimeter flashings;
Counterflashings to roof penetrations. (All repairs most meet manufacturer
guidelines)
Section 07 71 00 - Manufactured Roof Specialties: Counterflashings, gravel stops,
facias and expansion joints.
E.
F.
1.3
Section 07 92 00 - Joint Sealers.
REFERENCES
A.
ASTM C 518 - Standard Test Method for Steady-State Thermal Transmission
Properties by Means of the Heat Flow Meter Apparatus.
B.
ASTM D 93 - Standard Test Methods for Flash Point by Pensky-Martens Closed
Cup Tester.
07570-1
C.
ASTM D 412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic
Elastomers -Tension.
D.
ASTM D 562 - Standard Test Method for Consistency of Paints Measuring Krebs
Unit (KU) Viscosity Using a Stormer-Type Viscometer.
E.
ASTM D 570 - Standard Test Method for Water Absorption of Plastics.
F.
ASTM D 471 - Standard Test Method for Rubber Property, Effect of Liquids
G.
ASTM D 624 - Standard Test Method for Tear Strength of Conventional Vulcanized
Rubber and Thermoplastic Elastomers.
H.
ASTM D 903 - Standard Test Method for Peel or Stripping Strength of Adhesive
Bonds , adhesive bonding, peel strength, stripping strength.
I.
ASTM D 1353 - Standard Test Method for Nonvolatile Matter in Volatile Solvents for
Use in Paint, Varnish, Lacquer, and Related Products.
J.
ASTM D 1549 - Test Method for Determination of Solar Reflectance
K.
ASTM D 1621 - Standard Test Method for Compressive Properties of Rigid Cellular
Plastics.
L.
ASTM D 1622 - Standard Test Method for Apparent Density of Rigid Cellular
Plastics.
M.
ASTM D 1644 - Standard Test Methods for Nonvolatile Content of Varnishes.
N.
ASTM D 1653A - Standard Test Methods for Water Vapor Transmission of Organic
Coating Films.
O.
ASTM D 2126 - Standard Test Method for Response of Rigid Cellular Plastics to
Thermal and Humid Aging.
P.
ASTM D 2240 - Standard Test Method for Rubber Property, Durometer Hardness.
Q.
ASTM D 2370 - Standard Practice for Calculating Viscosity Index from Kinematic
Viscosity at 40 and 100 degrees C.
R.
ASTM D 2697 - Standard Test Method for Volume Nonvolatile Matter in Clear or
Pigmented Coatings.
S.
ASTM D 2794 - Standard Test Method for Resistance of Organic Coatings to the
Effects of Rapid Deformation (Impact).
T.
ASTM D 2856 - Standard Test Method for Open-Cell Content of Rigid Cellular
Plastics by the Air Pycnometer.
U.
ASTM D 6083 - Standard Specification for Liquid Applied Acrylic Coating Used in
Roofing.
V.
ASTM D 6694 - Specification for Liquid-Applied Silicone Coating Used in Spray
Polyurethane Foam Roofing.
07570-2
1.4
1.5
W.
ASTM E 84 - Standard Test Method for Surface Burning Characteristics of Building
Materials, flame spread, flame spread index, smoke developed, smoke developed.
X.
American Wood Preserve Bureau (AWPB) Standard LP-2
Y.
UL 790 - Standard Test Methods for Fire Tests of Roof Coverings.
Z.
SPFA (Spray Foam Allinace) AY Documents
DESIGN / PERFORMANCE REQUIREMENTS
A.
Underwriters Laboratories, Inc. UL 790: Class A Fire Hazard Classification as
applied to the deck types and inclines listed.
B.
Factory Mutual Approval for Bayseal Polyurethane Foam and Bayblock II, Bayblock
HT coatings for use in Class 1 roof construction as described in the current edition of
the FM Approval Guide. Windstorm rated 1-60 to 1-180 (depending on construction).
C.
Miami Dade NOA No. 03-0820.01 for Bayer MaterialScience LLC’ single component
Silicone coating system SCM 3400 Series membrane applied over foam roofs and
complying with the Florida Building Code including High Velocity Hurricane Zone.
D.
Miami Dade NOA No. 05-1202.02 for Polyurethane Foam and Bayblock Acrylic
Coating over Concrete Deck and complying with the Florida Building Code including
High Velocity Hurricane Zone.
E.
Miami Dade NOA No. 05-1202.01 for Polyurethane Foam and Bayblock Acrylic
Coating over Steel Deck and complying with the Florida Building Code including
High Velocity Hurricane Zone.
F.
Miami Dade NOA No. 06-0320.25 for Polyurethane Foam and Bayblock Acrylic
Coating over Recover Deck and complying with the Florida Building Code including
High Velocity Hurricane Zone.
G.
International Code Council (ICC) report ERS 1221 for special code requirements.
SUBMITTALS
A.
Submit under provisions of Section 01 33 00.
B.
Product Data: Manufacturer's data sheets on each product to be used, including:
1.
Preparation instructions and recommendations.
2.
Storage and handling requirements and recommendations.
3.
Installation methods.
C.
LEED Submittals: Provide documentation of how the requirements of Credit will be
met:
1.
List of proposed materials with recycled content. Indicate post-consumer
recycled content and pre-consumer recycled content for each product having
recycled content.
2.
Product data and certification letter indicating percentages by weight of postconsumer and pre-consumer recycled content for products having recycled
content.
3.
List of proposed materials and certification letter indicating use of materials
having a Solar Reflective Index equal to or greater then the required values
for a minimum of 75 percent of the roof surface.
07570-3
1.6
1.7
1.8
1.9
D.
Selection Samples: For each finish product specified, two complete sets of color
chips representing manufacturer's full range of available colors.
E.
Verification Samples: For each finish product specified, two samples, minimum size
6 inches (150 mm) square, representing actual product and color.
F.
Manufacturer's Certificates: Certify products meet or exceed specified requirements.
QUALITY ASSURANCE
A.
Manufacturer Qualifications: Company specializing in manufacturing urethane foam
products and systems of this section with minimum ten years documented
experience.
B.
Installer Qualifications: A current Bayer MaterialScience LLC Qualified Applicator
specializing in performing Work of this section with minimum three years
documented experience.
C.
Mock-Up: Provide a mock-up for evaluation of surface preparation techniques and
application workmanship.
1.
Finish areas designated by Architect.
2.
Do not proceed with remaining work until workmanship, color, and sheen are
approved by Architect.
3.
Refinish mock-up area as required to produce acceptable work.
DELIVERY, STORAGE, AND HANDLING
A.
Store products in manufacturer's unopened packaging, clearly marked with the
manufacturer's name, brand name, product identification, type of material, safety
information, manufacture date, and lot numbers until ready for installation.
B.
Store acrylic coating materials between 50 degrees F (18 degrees C) and 90
degrees F (29 degrees C) with careful handling to prevent damage to products. If
conditions exceed these ranges, special consideration in storage must be taken. Do
not store at high temperatures in direct sunlight.
C.
Protect all materials from exposure to moisture, freezing and other damage during
transit, handling, storage, and installation.
D.
Store and dispose of solvent-based materials, and materials used with solventbased materials, in accordance with requirements of local authorities having
jurisdiction.
PRE-INSTALLATION MEETINGS
A.
Convene pre-installation meeting a minimum of two weeks prior to commencing
work of this section.
B.
Attendance: Architect, Contractor and roof system applicator.
C.
Agenda: Review installation sequence and scheduling.
PROJECT CONDITIONS
07570-4
A.
Maintain environmental conditions (temperature, humidity, and ventilation) within
limits recommended by manufacturer for optimum results. Do not install products
under environmental conditions outside manufacturer's absolute limits.
B.
Do not apply polyurethane foam or roof coating during periods of rain, snow, fog,
and mist.
C.
Do not apply the polyurethane foam when substrate or ambient air temperatures are
below 50 degrees F (10 degrees C) or above 120 degrees F (49 degrees C), or
when wind velocities exceed 15 mph. Do not apply polyurethane foam when the
substrate surface temperature is less than 5 degrees F (minus 15 degrees C) above
the ambient temperature.
D.
Do not apply acrylic roof coatings at temperatures below 50 degrees F (10 degrees
C) or when there is a possibility of temperatures falling below 32 degrees F (0
degrees C) within a 24 hour period.
E.
Use windscreens during the application of the polyurethane foam and roof coating to
prevent overspray onto surfaces not intended to receive foam and coating. Under no
circumstances shall the polyurethane foam be applied when wind speeds exceed 15
miles per hour.
1.10 WARRANTY
A.
Provide Bayer MaterialScience LLC 10-year Full labor and Material Warranty upon
completion, inspection and acceptance of the project. Warranty shall cover repair of
leaks caused by deterioration of any component of the installed System, improper
workmanship in the roof installation, and defects in the coating.
PART 2 PRODUCTS
2.1
2.2
MANUFACTURERS
A.
Acceptable Manufacturer: Bayer MaterialScience LLC, 2400 Spring Stuebner Rd.,
Spring, TX 77389. ASD. Phone Toll Free: (800) 221-3626. Phone: (281) 350-9000.
Fax: (281) 288-6450. Web Site: www.polyurethanes.bayer.com. E-mail:
________________@ bayer.com.
B.
Substitutions: Not permitted.
C.
Requests for substitutions will be considered in accordance with provisions of
Section 01600.
POLYURETHANE FOAM
A.
General: Spray, two-component monolithic polyurethane foam shall be Bayer
MaterialScience LLC Bayseal , two- component foam designed for use as a selfadhering, seamless, high insulating, spray applied rigid polyurethane foam roof
system, as manufactured by Bayer MaterialScience LLC.
B.
Bayseal 2.7 is designed for spray application and shall have the following minimum
physical properties when cured:
1.
Minimum in-place Density: Minimum 2.7 lb/cf when tested in accordance with
ASTM D 1622.
2.
Compressive strength: Minimum 45 psi when tested in accordance with
ASTM D 1621.
07570-5
3.
C.
2.3
Closed cell content: Minimum 90 percent when tested in accordance with
ASTM D 2856.
4.
R-Value aged: 6.4 hr/sf/degrees F/Btu minimum at 1 inch thick when tested
in accordance with ASTM C 518.
5.
Dimensional Stability, 7 days, 158 degrees F, 100 percent R.H: Percent
volume change, less than 1 percent when tested in accordance with ASTM D
2126.
6.
Flame spread: Class II, less than 75 when tested in accordance with ASTM E
84.
Bayseal 3.0 is designed for spray application and shall have the following minimum
physical properties when cured:
1.
Minimum in-place Density: 3.0 lb/cf when tested in accordance with ASTM D
1622.
2.
Compressive strength: Minimum 50 psi when tested in accordance with
ASTM D 1621.
3.
Closed cell content: Minimum 90 percent when tested in accordance with
ASTM D 2856.
4.
R-Value aged: 6.4 hr/sf/degrees F/Btu minimum at 1 inch thick when tested
in accordance with ASTM C 518.
5.
Dimensional Stability, 7 days, 158 degrees F, 100 percent R.H: Percent
volume change, less than 1 percent when tested in accordance with ASTM D
2126.
6.
Flame spread: Class II, less than 75 when tested in accordance with ASTM E
84.
ACRYLIC ELASTOMERIC COATING
A.
B.
Acrylic elastomeric coatings shall be Bayblock II/IIBase a technologically advanced,
high-solids, fire retardant, thixotropic, acrylic latex coatings uniquely formulated for
the protection of sprayed-in place polyurethane foam insulation, stucco, concrete
block, metal, single ply, and modified bituminous roofing. Acrylic latex coating shall
have the following minimum properties:
1.
Tensile Strength: 279 psi when tested in accordance with ASTM D 412.
2.
Elongation: 502 percent when tested in accordance with ASTM D 412.
3.
Reflectivity: 0.87
4.
Emissivity: 0.89 percent.
5.
Fire Rating: UL 790 Class A. Combustible Deck Class B.
6.
Solids by Weight: 70 percent plus or minus 2 when tested in accordance with
ASTM D 6083.
7.
Solids by Volume: 55 percent plus or minus 2 when tested in accordance with
ASTM D 6083.
8.
Theoretical Coverage DFT: 9.5 dry mils on100 sq ft.
9.
Temperature Limits: minus 30 degrees F to plus 200 degrees F.
10.
Color Topcoat:
a.
White.
b.
Gray.
c.
Ivory Gray.
11.
Color Basecoat: Gray.
Bayblock HT/HTBase is a technologically advanced, high-solids, alkali resistant,
thixotropic, acrylic elastomeric coating uniquely formulated for the protection of
sprayed-in place polyurethane foam, metal, polyurea, stucco, siding, and concrete.
Acrylic elastomeric coating shall have the following minimum properties:
1.
Tensile Strength: 358 psi at 20 mils when tested in accordance with ASTM D
2370.
2.
Elongation: 485 percent at 20 mils when tested in accordance with ASTM D
412.
07570-6
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
2.4
2.5
Adhesion: 4.15 pli plus or minus 0.2 when tested in accordance with ASTM C
794 and ASTM D 903.
Hardness: 72.3 when tested in accordance with ASTM C 661.
Permeance: 7.1 at 20 mils when tested in accordance with ASTM E 96
Procedure B.
Tear Resistance: 112 psi when tested in accordance with ASTM D 624.
Fire Rating: UL 790 Class A. Combustible Deck Class B.
Solids by Weight: 65 percent plus or minus 2 when tested in accordance with
ASTM D 1644,
Flash Point: No flash to boiling when tested in accordance with ASTM D 93.
Solids by Volume: 55 percent plus or minus 2 when tested in accordance with
ASTM D-2697
Theoretical Coverage DFT: 9.5 dry mils on 100 sq ft.
Volatile Organic Compounds: US EPA Reference Method 24 0 g/L.
Accelerated Weathering: Pass, when tested in accordance with ASTM G 26
(3000 hours).
Salt Spray Resistance: Pass, when tested in accordance with ASTM B 117.
Wind Driven Rain: Pass, when tested in accordance with Fed Spec. TT-C555B.
Hail Resistance: Pass, when tested in accordance with FM Severe Hail Test.
Low Temperature Flexibility: Pass 1/8 mandrel, when tested in accordance
with ASTM C 734.
Solar Reflectance (White): 81.8 percent when tested in accordance with
ASTM C 1549 (CRRC Testing).
Thermal Emittance: 0.94 when tested in accordance with ASTM C 1371
(CRRC Testing).
Color HT Topcoat:
a.
White.
b.
Gray.
c.
Ivory Gray.
Color Basecoat: Gray or Ivory.
PRIMER COATING
A.
Bayblock Prime RI: A two component, water based rust inhibitive primer for the
preparation of ferrous and non-ferrous metal surfaces for the application of
elastomeric coatings and spray polyurethane foam.
B.
Bayblock Prep, is a water based blend of surfactants formulated for the preparation
of fully adhered EPDM roof surfaces.
C.
Bayblock Prime 100: A single component, water-based, general purpose primer to
for the preparation of most non-metallic surfaces for the application of elastomeric
coatings and spray polyurethane foam. Suitable for built-up roofing, wood, concrete,
spray polyurethane foam, aged asphaltic and other substrates.
ACCESSORIES
A.
Wood nailers, sleepers or other wood blocking to be No. 2 Common Douglas fir or
yellow pine, pressure treated in accordance with the current American Wood
Preserve Bureau (AWPB) Standard LP-2.
B.
Fasteners:
07570-7
1.
2.
Fasteners for securing to wood substrates: Hot dipped galvanized steel nails,
domestically produced; 3-1/2 inches (6.4 mm) long 16D spiral shank wire nail.
Fastener for nailing sheet metal flanges to wood substrate: Hot dipped
galvanized steel roofing nails, No. 11 or 12 gauge, barbed shank, minimum
3/8 inch (9.5 mm) diameter and head 1-1/2 inches (38 mm) long.
PART 3 EXECUTION
3.1
3.2
EXAMINATION
A.
Do not begin installation until substrates have been properly prepared.
B.
Verify that all surfaces to receive polyurethane foam insulation are clean, dry and
free of dust, dirt, debris, oil, solvents and all materials that may adversely affect the
adhesion of the polyurethane foam.
C.
Verify that all roof penetrations and flashings are properly installed and secured.
Verify that metal roof opening covers designated to receive polyurethane foam
insulation are permanently secured.
D.
If substrate preparation is the responsibility of another installer, notify Architect of
unsatisfactory preparation before proceeding.
PREPARATION
A.
Clean surfaces thoroughly prior to installation.
B.
Prepare surfaces using the methods recommended by the manufacturer for
achieving the best result for the substrate under the project conditions.
C.
Provide masking protection as may be needed to prevent overspray of material on
adjacent buildings and appurtenances, vehicles and portions of building not to be
coated. Removal all overspray as required. Mask building surfaces to terminate the
foam and coating in a neat, straight line.
D.
Apply primer to all surfaces to receive foam of type and rate as recommended by the
foam manufacturer.
E.
Re-Roofing
1.
Verify that existing edge metal is properly attached and secured and that
attachment is to a sound substrate. Attachments must be in two rows
staggered 3 inches (76 mm) on center.
2.
Inspect any masonry or other surfaces to receive spray foam insulation for
structural soundness.
3.
Remove and replace any wood nailers or other structural members that have
lost their integrity.
4.
Cut out and remove any wet substrate. Assure deck is properly cleaned, dried
and primed prior to applying foam and coating.
5.
Remove, raise or otherwise modify as necessary all existing roof-installed
equipment to permit installation of roof system.
6.
Mechanically attach all loose, slumping or otherwise deteriorated wall and
penetration flashings with appropriate fasteners and plates.
7.
Power broom, power wash and vacuum or otherwise remove all loose gravel,
dirt, dust, oil, grease, etc. as may be necessary to create a strong bond
between materials applied and existing roof.
07570-8
8.
9.
10.
11.
Cover and protect all immovable objects and air intakes within area of
spraying operations.
Verify that all roof drains and internal drain pipes are free of debris and
draining properly prior to performing the re-roofing construction.
Drains should be at the correct elevation to match the specified height of the
sprayed foam.
Mark all existing low areas where water ponds and areas with obviously poor
drainage, in order to facilitate corrective procedures during roof system
installation. Correct low areas by applying leveling foam of sufficient thickness
in localized areas prior to applying the minimum specified foam thickness.
F.
Surface Preparation - Concrete Substrate
1.
Remove loose dirt, dust, and debris using power broom, power blower or
vacuum equipment.
2.
Remove contaminants such as grease, oil, and asphalt with proper chemical
solvents or other approved methods.
3.
Concrete decks shall be minimum 2,500 psi compressive strength structural
concrete that has been cured a minimum of 28 days. Concrete may be either
pre-cast or poured in-place.
4.
Tape or seal openings or joints greater than 1/4 inch (6 mm) wide.
5.
Concrete surfaces shall be smooth and dense with a firm hard surface. Loose
granular finishes are not acceptable.
6.
Prime concrete with Baylock SG Primer at the minimum rate of 200 SF per
gallon.
G.
Surface Preparation - Metal Substrate
1.
Metal substrate shall be of minimum 22 gauge steel with a deflection of less
than 1/240 of span.
2.
Metal surfaces shall be free of all rust, scale, dirt, grease, oil, chalking, paint
or other contaminants.
3.
Galvanized Steel shall be primed using an acid wash primer.
4.
Steel Decks shall be free of loose scale and rust. Clean surfaces of dust or
chalk using a power broom, vacuum equipment or compressed air. Remove
grease oil or surface chalk with a detergent solution such as Tri-sodium
Phosphate or a combination of methods. Detergent solutions must be
completely removed by rinsing with clean water.
5.
Prime all metal with Bayblock Prime RI at the rate of 300 SF per gallon.
6.
Metal decks flutes shall be covered with one layer of 1/2 inch (12.5 mm) thick
mechanically attached fire rated gypsum board.
7.
Fasteners shall be Factory Mutual Approved Dekfast #14's, 1-1/4 inch (32
mm) and coated with corrosion inhibitors. All fasteners are to be installed with
a 2 to 3 inch (51 to 76 mm) steel, 26 gauge, and galvanized plate. Minimum
fastening pattern shall be one fastener and plate every four square feet. Apply
fasteners in pattern and spacing appropriate to materials and fasteners used
as recommended by the manufacturer.
8.
Priming gypsum board with Bayblock Prime 100 at the rate of 200 SF per
gallon prior to application of foam.
H.
Surface Preparation - Wood Surfaces
1.
Deck shall be dry and free of loose dirt, grease, oil and other contaminants.
2.
Remove loose dirt by use of air jet, vacuum, hand or power broom. No
washing is permitted.
3.
Remove grease, oil or other contaminants by use of proper chemical solvents.
4.
Plywood joints in excess of 1/4 inch (6 mm) shall be taped or filled prior to
application of sprayed urethane foam.
07570-9
5.
6.
T and G materials must be overlaid with a minimum of 1/4 inch (6 mm) thick
plywood sheathing or other acceptable flat sheet material.
Priming of substrate with Bayblock Prime 100 at the rate of one gallon per
200 SF.
I.
Surface Preparation - Existing Built-up Roof
1.
Power broom, power wash and vacuum or otherwise remove all loose gravel,
dirt, dust, oil, grease, etc. as may be necessary to create a strong bond
between materials applied and existing roof.
2.
Exercise care in removing of gravel so as not to damage top layer of roofing
felts. Do not allow large amounts of gravel to accumulate in any one location
that might overload the roof deck structure.
3.
Cut out all existing blisters, fish mouths, buckles, ridges, felt delaminations,
punctures and soft spots in an industry acceptable manner.
4.
Repair membrane splits by removing the gravel and cleaning an area six
inches wide on each side of split. Mechanically attach the membrane on each
side of the split.
5.
Inspect substrate thoroughly for moisture. If evidence of moisture is
suspected, then special moisture detection method must be used to
determine the exact locations of wet substrate. Wet substrate, if encountered,
and other unsuitable materials shall be cut out, deck properly cleaned, dried
and primed prior to applying foam and coating.
6.
Mechanically attach all loose, slumping or otherwise deteriorated wall and
penetration flashings in accordance with manufacturer’s recommendations.
7.
Prime all existing asphaltic substrates with Bayblock 100 at the rate of one
gallon per 100 SF.
J.
Surface Preparation - Existing Fully Adhered Single Ply Roof:
1.
Cut out all existing blisters, fish mouths, buckles, ridges, punctures and soft
spots in an industry acceptable manner.
2.
Repair membrane splits by removing the gravel and cleaning an area six
inches wide on each side of split. Mechanically attach the membrane on each
side of the split.
3.
Inspect substrate thoroughly for moisture. If evidence of moisture is
suspected, then special moisture detection method must be used to
determine the exact locations of wet substrate. Wet substrate, if encountered,
and other unsuitable materials shall be cut out, deck properly cleaned, dried
and primed prior to applying foam and coating.
4.
Surface must be clean, sound, dry and free of any materials that would inhibit
proper adhesion of the primer.
5.
Membranes must be primed with a suitable primer/surfacer suitable for use
with the topcoat specified.
K.
Surface Preparation - Existing Ballasted or Mechanically Fastened Single Ply Roof:
1.
Ballasted roofs must be removed or recovery board installed over the roof
after ballast has been removed. Recovery board must be installed according
manufacturers recommendations for applicable wind uplift requirements.
2.
Mechanically fastened roofs must have additional fasteners with 4 to 6 inch
plates and perimeter attachment as follows:
a.
Remove 18 inches of membrane around the perimeter.
b.
Fasten the severed edge to the deck with fasteners every 6 inches.
Alternatively fasten the edge to the deck with 6 inch wide 22 gage
metal batons.
c.
Prime exposed roof deck with a suitable primer.
d.
Fasten the field of the roof surface with a minimum of 1 fastener every
18 inches.
07570-10
3.
4.
5.
6.
7.
L.
3.3
3.4
e.
Clean fasteners and batons and prime with a metal primer.
Cut out all existing blisters, fish mouths, buckles, ridges, punctures and soft
spots in an industry acceptable manner.
Repair membrane splits by removing the gravel and cleaning an area six
inches wide on each side of split. Mechanically attach the membrane on each
side of the split.
Inspect substrate thoroughly for moisture. If evidence of moisture is
suspected, then special moisture detection method must be used to
determine the exact locations of wet substrate. Wet substrate, if encountered,
and other unsuitable materials shall be cut out, deck properly cleaned, dried
and primed prior to applying foam and coating.
Surface must be clean, sound, dry and free of any materials that would inhibit
proper adhesion of the primer.
Membranes must be primed with a suitable primer/surfacer suitable for use
with the system specified.
Surface Preparation - Cement Fiber Board, Gypsum Board, Isocyanurate Board.
1.
Materials installed over metal deck must be installed with mechanical
fasteners in accordance with Factory Mutual wind uplift criteria or the
requirements of the applicable building code. Materials installed over other
surfaces must be installed in accordance with Factory Mutual wind uplift
criteria or the requirements of the applicable building code.
2.
Butt boards firmly together without gaps or openings. Joints exceeding 1/4
inch shall be taped or caulked with a suitable material.
3.
Use special care to prevent materials from getting wet prior to being protected
by spray polyurethane foam. Wet materials shall be replaced prior to the
application of foam.
4.
Remove loose dirt and debris by using compressed air, vacuum, or light
brooming. No power brooming is permitted.
5.
Protect installed materials from spills of contaminants such as oil, grease,
solvents, and prior to application of foam. Contaminated materials shall be
replaced prior to application of foam,
6.
Surface must be clean, sound, dry and free of any materials that would inhibit
proper adhesion of the primer.
7.
Surfaces must be primed with a primer suitable for use with the foam and
topcoat specified.
SAFETY REQUIREMENTS
A.
Exercise care not to allow fumes from the polyurethane foam and coating materials
to enter the building, using the following minimum precautions:
1.
Turn off all HVAC equipment and cover all intake vents and other potential
sources of air entry into the building.
2.
Provide CO2 or other dry chemical fire extinguishers to be available at the
jobsite.
3.
Provide adequate ventilation for all areas being worked.
B.
Proper safety precautions shall be followed throughout the entire roofing operation.
Conform to safety precautions of Spray Polyurethane Foam Alliance of the American
Plastics Council’s Recommendations for the Safe Handling and Use of Sprayed
Urethane Foam and Coating Materials.
C.
Provide fire extinguishers available on the roof and at all work sites at all times
during roofing operations.
SPRAY POLYURETHANE FOAM APPLICATION
07570-11
3.5
A.
Apply polyurethane foam in strict accordance with the manufacturer's specifications
and application instructions.
B.
Apply in a minimum of 1⁄2 inch (12.5 mm) thick passes and 1-1/2 inch (38 mm)
maximum thick passes. Total thickness of the polyurethane foam shall be a
minimum of 1 inch (25.4 mm), except where tapering is required to facilitate
drainage.
C.
Apply the full thickness of polyurethane foam in any area on the same day.
D.
Applied to ensure proper drainage, resulting in no ponding water. Ponding water is
generally defined as "an area of 100 square feet or more, which holds in excess of
1⁄2 inch (12.5 mm) of water as measured 24 hours after rainfall.
E.
Terminate polyurethane foam neatly a minimum of 4 inches (102 mm) above the
finished roof surface at roof penetrations. Foamed-in-place cants shall be applied to
allow a smooth transition from the horizontal to vertical surface and shall be applied
prior to the application of additional foam lifts to achieve specified thickness. Mask
building surfaces to terminate the foam and coating in a neat, straight line.
F.
Finished polyurethane foam surface texture shall be "smooth to orange-peel", free of
voids, pinholes and depressions. "Verge of popcorn" texture is acceptable if it can
be thoroughly and completely coated. Popcorn and treebark textures are not
acceptable. Unacceptable foam textures must be removed and re-foamed prior to
coating application.
APPLICATION OF ACRYLIC ELASTOMER ROOF COATING
A.
Polyurethane foam surface shall be free of moisture, dust, dirt, debris and other
contaminants that would impair the adhesion of the silicone coating.
B.
If foam is exposed in excess of three days and additional foam thickness is
necessary, or surface oxidation has occurred surface shall be primed before coats.
Prime with Bayblock Prime NS primer applied at a rate of 200 square feet per gallon.
C.
Spray and apply coating in accordance with the manufacturer's application
instructions and precautions in the technical datasheet.
D.
Apply acrylic elastomeric roof coating on the same day as the polyurethane foam
application, and after the polyurethane foam has been allowed to cure a minimum of
one hour. If the basecoat is not applied within 24 hours of polyurethane foam,
remove and repair all signs of oxidation, or other damages as required by
manufacturer.
E.
If foam is exposed in excess of three days and additional foam thickness is
necessary, or surface oxidation has occurred surface shall be primed before coating
with acrylic elastomeric roof coating. Prime with Bayblock Prime NS applied at a rate
of 200 square feet per gallon.
F.
Acrylic elastomeric coatings coating shall be applied in a minimum of three separate
coats by spray or roller at the rate of 1-1/4 gallons per coat per 100 square feet.
07570-12
3.6
3.7
3.8
G.
Allow each coat to cure a minimum of 12 hours before proceeding with successive
coats. Second and successive coats must be applied within 48 hours to ensure good
adhesion. Allow top coat to cure a minimum of 72 hours without foot traffic.
H.
Nominal thickness of the final dry film protective elastomeric acrylic coating system
shall be an average 33 mils with a minimum of 28 mils.
I.
Edges of the roof shall be precoated in a "picture framing" fashion so as to have at
least one additional coat on the edges than the field of the roof.
J.
Mask off metal and other surfaces not to receive coating.
K.
All foam is to be coated. Coating shall be extended up and over all foam or vent
pipes and terminate a minimum of 2 inches (51 mm) above the foam creating a selfterminating flashing.
L.
Coat foam the same day of application, unless delayed by inclement climatic
conditions.
M.
Equipment Walkway Coatings: Roofing granules or a reinforced polyester mesh
shall be installed around all mechanical equipment as indicated on the Drawings.
Install at least six feet around the perimeter as follows:
1.
Apply an additional coat of acrylic coating at the rate of 1-1/2 gallons per 100
square feet.
2.
Broadcast grade 11 roofing granules at a rate of 50 pounds per 100 square
feet or lay down the reinforced polyester mesh while the coating is in a fluid
condition.
3.
Seal granules or polyester mesh in by applying additional coating at the rate
of 3/4 gallon per 100 square feet.
FIELD QUALITY CONTROL
A.
Roof system manufacturer shall provide independent inspection firm, to perform
periodic follow-up inspections on the roof, through a standard warranty inspection
program.
B.
Any areas that do not meet the minimum standards for application as specified
herein shall be corrected by the applicator. Manufacturer's inspection or verification
shall not constitute acceptance of responsibility for any improper application of
material.
PROTECTION
A.
Protect installed products until completion of project.
B.
Touch-up, repair or replace damaged products before Substantial Completion.
SCHEDULES
A.
:
1.
2.
3.
B.
:
1.
07570-13
2.
3.
END OF SECTION
07570-14