G-P Gypsum Corporation
133 Peachtree Street, N.E.
Atlanta, GA 30303
Technical Hotline: 1-800-225-6119 (M-F 8-7 EST)
ToughRock™ Sound Deadening Board has a
noncombustible, dimensionally stable, inert
gypsum core. The surfacings on both faces
and on the long edges are 100% recycled
paper. The ends are square cut, smooth
finished with no paper facing.
ToughRock Sound Deadening Board is a base
layer sound transmission control component
used in interior gypsum board assemblies,
load-bearing wood stud partitions and
non-load bearing steel stud partitions. It is
designed for direct attachment (screws, nails
or adhesive) to wood and metal framing or
ToughRock Sound Deadening Board is a nonstructural
product and should not be used as a
nailing base to support heavy wall mounted
objects. It is designed for use as a base layer to
be covered by a second gypsum board.
It is intended for interior applications
only; it must be kept dry and not used
where exposure to moisture is extreme
Do not use ToughRock Sound Deadening
Board where there is prolonged exposure to
temperatures exceeding 125°F and/or
continuous exposure to extreme humidity,
e.g., located adjacent to wood burning stoves,
heating appliances, swimming pools, saunas or
ASTM C 442, CSA-A82.27-M and Federal
Specification SS-L-30D, Type IV, Grade X.
Building Code Conformity:
ToughRock Sound Deadening Board complies
with the requirements of major building codes.
Sizes and Edges:
Thickness Widths Lengths
nominal nominal standard
1/4( 4* 8*
Fasteners: Nails, screws or adhesive.
Finishing: Tape, ready mixed or setting type
joint compound, textures, acoustical sealant.
Surface Burning Characteristics
Flame spread rating of 15 and smoke
developed 0, when tested in accordance with
ASTM E 84 or CAN/ULC-S102.
Fire Resistance Rating
ToughRock Sound Deadening Board is
classified for fire resistance by
Sound Transmission Class (STC) ratings are
determined by tests made on assemblies
of specific materials, per ASTM E 90. Sound
rated assemblies require sealing at top,
bottom, intersections and other penetrations
to ensure the effectiveness of the assembly
and obtain desired STC rating. Test reports
are available upon request.
ToughRock Sound Deadening Board should
be installed according to the Gypsum
Association Publication GA-201 “Using
Gypsum Board for Walls and Ceilings,”
GA-216 “Recommended Specifications for
the Application and Finishing of Gypsum
Board” and ASTM C 840 “Standard
Specification for Application and Finishing of
Gypsum Board” for non-fire rated construction.
For non-rated construction, installation
methods for single or multi-layer construction
involving attachments using mechanical
fasteners, adhesive or adhesive with
supplemental fasteners are numerous
and varied. Refer to Gypsum Association
publications for application and
ToughRock Sound Deadening Board can be
cut by scoring and snapping or sawing,
working from the face side. All cut edges and
ends are smoothed by rasping or other
suitable methods to form tight-fitting joints
when installed. The installation method
selected should be planned carefully to
minimize the number of end joints. Stagger
joints on opposite sides of framing for both
sound deadening board and for facing layer.
Avoid back-to-back mounting of electrical and
plumbing outlets. Caulk perimeters and
During installation involving cutting, scoring
and breaking, safety glasses are recommended.
If the work environment is dusty, an approved
respirator should be worn. Do not use a
Stack ToughRock Sound Deadening Board on
a flat, level surface. As individual sheets are
removed for installation, they should be raised
carefully on edge and carried in a vertical
position. Appropriate handling is also outlined
in Gypsum Association Publications GA-216
Take care to avoid impact, undue flexing
and subsequent damage to board edges, ends
Material Safety Data Sheet
Material Safety Data Sheet (MSDS) is
available upon request.
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