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SECTION 07 22 20
ROOF BOARDS
PART 1 GENERAL
1.01 SUMMARY
A. Section Includes: Fiberglass-mat faced gypsum roof boards for application
directly under roof membrane systems.
1.02 REFERENCES
A. ASTM International (ASTM):
1. ASTM C209 Standard Test Method for Cell. Fiber Insulating Board
2. ASTM C472 Standard Test Methods for Physical Testing of Gypsum,
Gypsum Plasters and Gypsum Concrete.
3. ASTM C473 Standard Test Methods for Physical Testing of Gypsum Panel
Products.
4. ASTM C1177 Standard Specification for Glass Mat Gypsum Substrate for
Use as Sheathing.
5. ASTM D3273 Standard Test Method for Resistance to Growth of Mold on
the Surface of Interior Coatings in an Environmental Chamber.
6. ASTM E84 Standard Test Method for Surface Burning Characteristics of
Building Materials
7. ASTM E96 Standard Test Methods for Water Vapor Transmission of
Materials.
8. ASTM E108 Standard Test Methods for Fire Tests of Roof Coverings
9. ASTM E136 Standard Test Method for Behavior of Materials in a Vertical
Tube Furnace at 750 C.
10. ASTM E661 Standard Test Method for Performance of Wood and Wood-
Based Floor and Roof Sheathing Under Concentrated Static and Impact
Loads.
B. Underwriters Laboratories (UL): UL 790 Standard Test Methods for Fire Tests of
Roof Coverings.
C. [Florida Approvals: Roof boards shall have Florida Product Approval and Miami-
Dade County Product Control Approval.]
1.03 SUBMITTALS
A. Product Data and Installation Instructions: Submit manufacturer's product
data including installation instructions and substrate preparation
recommendations
B. Sample warranty: Submit a sample warranty identifying the terms and
conditions of the warranty as herein specified.
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1.04 QUALITY ASSURANCE
A. Inspection: Where applicable, allow for Owner's inspection and moisture testing
and reporting prior to installation of roof boards.
B. [Install roof board in mock-up as specified in [Section 01 4339 Mock-Ups.]
[Section ].]
1.05 DELIVERY, STORAGE, AND HANDLING
A. All components used in roofing systems, including DensDeck® Prime Roof
Boards, shall be protected from exposure to moisture before, during and after
installation.
B. Remove any plastic packaging from roof boards immediately upon receipt of
delivery. Failure to remove plastic packaging may result in entrapment of
condensation or moisture, which may cause application problems that are not
the responsibility of manufacturer
C. Any protective, plastic factory packaging that is used to wrap roof boards for
shipment is intended to provide temporary protection from moisture exposure
during transit only and is not intended to provide protection during storage after
delivery.
D. Roof boards stored outside shall be stored level and off the ground and
protected by a waterproof covering. Provide means for air circulation around and
under stored bundles of DensDeck® Prime Roof Boards. Use adequate
supports to keep the bundles flat, level and dry.
E. Care should also be taken during installation to avoid the accumulation of
moisture in the system. Roof boards shall be covered the same day as installed.
Avoid application of roof boards during rain, heavy fog and any other conditions
that may deposit moisture on the surface, and avoid the overuse of non-vented,
direct-fired heaters during winter months.
1.06 FIELD CONDITIONS
A. Application standards where applicable are in accordance with design assembly
specifics, system manufacturer requirements and the DensDeck®Technical
Guide.
B. Do not install DensDeck® Prime Roof Board that is moisture damaged.
Indications that panels are moisture damaged include, but not limited to,
discoloration, sagging, or irregular shape.
C. Installed DensDeck® Prime Roof Boards shall be dry, with free moisture content
of less than 1% using a moisture meter that has been set to the gypsum scale,
before applying adhesive, asphalt or membrane.
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D. All components used in roofing systems, including DensDeck® Roof Boards,
shall be protected from exposure to moisture before, during and after installation.
PART 2 PRODUCTS
2.01 MANUFACTURERS:
A. Georgia-Pacific Gypsum, LLC, products as specified herein.
2.02 COATED PRIME FIBERGLASS-MAT FACED GYPSUM ROOF BOARDS:
Specifier Note: Below is 1/4" board, 2-5/8" flute span.
A. Fiberglass Mat Faced Gypsum Roof Board:
1. Acceptable Product: GP Gypsum, DensDeck® Prime Roof Boards.
2. Thickness: 1/4 inch.
3. Width: 4 feet.
4. Length: [4 feet] [8 feet].
5. Weight:1.2 lb/sq. ft.
6. Surfacing: Primed Fiberglass Mat.
7. Flexural Strength, Parallel (ASTM C473): 40 lbf, minimum.
8. Flute Span (ASTM E661): 2-5/8 inches.
9. Permeance (ASTM E96): Greater than 30 perms.
10. R-Value (ASTM C518): 0.28.
11. Water Absorption (ASTM C473): Less than 5 percent of weight.
12. Surface Water Absorption (ASTM C473): Nominal 1.0 grams.
13. Compressive Strength (Applicable Sections of ASTM C472): Nominal 900
pounds per square inch.
14. Flame Spread/ Smoke Development (ASTM E84): Not more than 0 Flame
Spread, 0 Smoke Development
15. Combustibility (ASTM E136): Noncombustible
16. Fire resistance rating (UL 790 and ASTM E108): Class A
17. Mold Resistance (ASTM D3273): Scored a 10
Specifier Note: Below is '/2" board, 5" flute span.
B. Fiberglass Mat Faced Gypsum Roof Board:
1. Acceptable Product: GP Gypsum, DensDeck® Prime Roof Boards.
2. Thickness: 1/2 inch.
3. Width: 4 feet.
4. Length: [4 feet] [8 feet].
5. Weight: 2.0 lb/sq. ft.
6. Surfacing: Primed Fiberglass Mat.
7. Flexural Strength, Parallel (ASTM C473): 80 lbf, minimum.
8. Flute Span (ASTM E661): 5 inches.
9. Permeance (ASTM E96): Greater than 23 perms.
10. R-Value (ASTM C518): 0.56.
11. Water Absorption (ASTM C473): Less than 5 percent of weight.
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12. Surface Water Absorption (ASTM C473): Nominal 1.0 grams.
13. Compressive Strength (Applicable Sections of ASTM C472): Nominal 900
pounds per square inch.
14. Flame Spread/ Smoke Development (ASTM E84): Not more than 0 Flame
Spread, 0 Smoke Development
15. Combustibility (ASTM E136): Noncombustible
16. Fire resistance rating (UL 790 and ASTM E108): Class A
17. Mold Resistance (ASTM D3273): Scored a 10
Specifier Note: Below is 5/8" board, 8" flute span.
C. Fiberglass Mat Faced Gypsum Roof Board:
1. Acceptable Product: GP Gypsum, DensDeck® Prime Roof Boards.
2. Thickness: 5/8 inch.
3. Width: 4 feet.
4. Length: [4 feet] [8 feet].
5. Weight: 2.5 lb/sq. ft.
6. Surfacing: Primed Fiberglass Mat.
7. Flexural Strength, Parallel (ASTM C473): 100 lbf, minimum.
8. Flute Span (ASTM E661): 8 inches.
9. Permeance (ASTM E96): Greater than 17 perms.
10. R-Value (ASTM C518): 0.67.
11. Water Absorption (ASTM C473): Less than 5 percent of weight.
12. Surface Water Absorption (ASTM C473): Nominal 1.0 grams.
13. Compressive Strength (Applicable Sections of ASTM C472): Nominal 900
pounds per square inch.
14. Flame Spread/ Smoke Development (ASTM E84): Not more than 0 Flame
Spread, 0 Smoke Development
15. Combustibility (ASTM E136): Noncombustible
16. Fire resistance rating (UL 790 and ASTM E108): Class A
17. Mold Resistance (ASTM D3273): Scored a 10
2.03 FIBERGLASS-MAT FACED GYPSUM ROOF BOARDS:
Specifier Note: Below is board, 2-5/8" flute span.
A. Fiberglass Mat Faced Gypsum Roof Board:
1. Acceptable Product: GP Gypsum, DensDeck® Roof Boards.
2. Thickness: 1/4 inch.
3. Width: 4 feet.
4. Length: [4 feet] [8 feet].
5. Weight:1.2 lb/sq. ft.
6. Surfacing: Fiberglass Mat.
7. Flexural Strength, Parallel (ASTM C473): 40 lbf, minimum.
8. Flute Span (ASTM E661): 2-5/8 inches.
9. Permeance (ASTM E96): Greater than 50 perms.
10. R-Value (ASTM C518): 0.28.
11. Water Absorption (ASTM C473): Less than 10 percent of weight.
12. Surface Water Absorption (ASTM C473): Nominal 2.5 grams.
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13. Compressive Strength (Applicable Sections of ASTM C472): Nominal 900
pounds per square inch.
14. Flame Spread/ Smoke Development (ASTM E84): Not more than 0 Flame
Spread, 0 Smoke Development
15. Combustibility (ASTM E136): Noncombustible
16. Fire resistance rating (UL 790 and ASTM E108): Class A
17. Mold Resistance (ASTM D3273): Scored a 10
Specifier Note: Below is board, 5" flute span.
B. Fiberglass Mat Faced Gypsum Roof Board:
1. Acceptable Product: GP Gypsum, DensDeck® Roof Boards.
2. Thickness: 1/2 inch.
3. Width: 4 feet.
4. Length: [4 feet] [8 feet].
5. Weight: 2.0 lb/sq. ft.
6. Surfacing: Fiberglass Mat.
7. Flexural Strength, Parallel (ASTM C473): 80 lbf, minimum.
8. Flute Span (ASTM E661): 5 inches.
9. Permeance (ASTM E96): Greater than 35 perms.
10. R-Value (ASTM C518): 0.56.
11. Water Absorption (ASTM C473): Less than 10 percent of weight.
12. Surface Water Absorption (ASTM C473): Nominal 2.5 grams.
13. Compressive Strength (Applicable Sections of ASTM C472): Nominal 900
pounds per square inch.
14. Flame Spread/ Smoke Development (ASTM E84): Not more than 0 Flame
Spread, 0 Smoke Development
15. Combustibility (ASTM E136): Noncombustible
16. Fire resistance rating (UL 790 and ASTM E108): Class A
17. Mold Resistance (ASTM D3273): Scored a 10
Specifier Note: Below is 5/8" board, 8" flute span.
C. Fiberglass Mat Faced Gypsum Roof Board:
1. Acceptable Product: GP Gypsum, DensDeck® Roof Boards.
2. Thickness: 5/8 inch.
3. Width: 4 feet.
4. Length: [4 feet] [8 feet].
5. Weight: 2.5 lb/sq. ft.
6. Surfacing: Fiberglass Mat.
7. Flexural Strength, Parallel (ASTM C473): 100 lbf, minimum.
8. Flute Span (ASTM E661): 8 inches.
9. Permeance (ASTM E96): Greater than 32 perms.
10. R-Value (ASTM C518): 0.67.
11. Water Absorption (ASTM C473): Less than 10 percent of weight.
12. Surface Water Absorption (ASTM C473): Nominal 2.5 grams.
13. Compressive Strength (Applicable Sections of ASTM C472): Nominal 900
pounds per square inch.
14. Flame Spread/ Smoke Development (ASTM E84): Not more than 0 Flame
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Spread, 0 Smoke Development
15. Combustibility (ASTM E136): Noncombustible
16. Fire resistance rating (UL 790 and ASTM E108): Class A
17. Mold Resistance (ASTM D3273): Scored a 10
PART 3 EXECUTION
3.01 INSTALLATION
A Apply only as many roof boards as can be covered by a roof membrane system
in the same day.
B Board edges and ends shall be butted tightly together; do not gap edges or
ends.
Specifier Note: Select installation type from installation types below:
C. Adhesive Installation over Thermal Insulation, under Single-Ply Roofing Systems:
1. Stagger roof board end and edge joints minimum 12" over installed
insulation layers.
2. Stagger roof board end and edge joints minimum 6".
3. Adhere roof boards over installed insulation using adhesive as
recommended by roofing system manufacturer's product data.
4. Apply overall pressure to ensure full adhesion. Do not slide into place.
D. Hot-Mopped Installation over Thermal Insulation, under Modified Bitumen
Roofing Systems:
1. Stagger roof board end and edge joints minimum 12" over installed
insulation layers.
2. Stagger roof board end and edge joints minimum 6".
3. Prior to hot-mopping the roof boards to the substrates, ensure that the roof
boards are dry, with free moisture content less than 1°/o by weight using a
moisture meter that has been set to the gypsum scale.
4. Maximum asphalt application temperatures shall be 425°F (218°C) to 450°F
(232°C). Application temperatures above these recommended temperatures
may adversely affect roof system performance. Consult and follow roofing
system manufacturer's specifications for full mopping applications and
temperature requirements.
5. Follow accepted roofing industry guidelines for full mopping applications
such as EVT temperature guidelines, brooming and proper application rates
of asphalt.
6. DensDeck® Prime Roof Boards may be flood mopped to a substrate
followed by a flood mopped application of membrane using these guidelines:
a. Roof boards and substrate shall be dry.
b. Asphalt used to install roof boards should be allowed to cool prior to
mopping base sheet to top of DensDeck® Prime Roof Boards.
c. Allow base ply to cool before mopping additional plies or cap sheet to
limit the amount of direct heat that is applied to boards.
Specifier note: Below is for fire barrier installation (below thermal insulation), or for
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applications with no thermal insulation.
E. Installation Directly on Metal Decking:
1. Install roof boards with long edges bearing on and parallel to top flutes, so
that edges are supported.
2. Stagger roof board end and edge joints minimum 6".
3. [Adhesive installation: Adhere roof boards to metal deck using adhesive as
recommended by roofing system manufacturer's product data. Apply overall
pressure to ensure full adhesion. Do not slide into place.]
3. [Hot-mopped installation:
a. Prior to hot-mopping the roof boards to the substrates, ensure that the
roof boards are dry, with free moisture content less than 1% by weight
using a moisture meter that has been set to the gypsum scale.
b. Maximum asphalt application temperatures shall be 425°F (218°C) to
450°F (232°C). Application temperatures above these recommended
temperatures may adversely affect roof system performance. Consult and
follow roofing system manufacturer's specifications for full mopping
applications and temperature requirements.
c. Follow accepted roofing industry guidelines for full mopping
applications such as EVT temperature guidelines, brooming and proper
application rates of asphalt.
d. DensDeck® Prime Roof Boards may be flood mopped to a substrate
followed by a flood mopped application of membrane using these
guidelines:
1) Roof boards and substrate shall be dry.
2) Asphalt shall be allowed to cool prior to mopping base sheet to top
of DensDeck® Prime Roof Boards.
3) Allow base ply to cool before mopping additional plies or cap
sheet to limit the amount of direct heat that is applied to boards.]
F. Concrete and Lightweight Concrete Roof Decks; new roofing and re-roofing:
When roofing systems are installed on new poured concrete or light weight
concrete decks or when re-roofing over an existing concrete deck, install a vapor
barrier above the concrete to limit the migration of water from the concrete into
the roof assembly. Consult the roofing system manufacturer or design authority
for specific instructions for applying other products to roof boards.
G. Following roofing system installation, avoid leaks and properly manage water
accumulation.
1. Eliminate moisture vapor movement by convection and control the flow of
water by gravity through imperfections in the roof system.
2. After a leak has occurred, do not allow condensation on the upper surface
of the roof membrane, and all moisture accumulations as a result of the
leak shall be removed, leaving dry substrates and materials.
3.02 PROTECTION
A. Protect roof board installations from damage and deterioration until the date of
Substantial Completion.
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END OF SECTION 07 22 20
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