52 USG Plaster Systems
Good Design Practices
8 Ceramic Tile impeRial Brand Gypsum Base and Rocklath Plaster Base are not recommended as a base for the adhesive application
of ceramic tile and plastic-faced panels.
FibeRock Brand aqua-touGh Interior Panels or DuRock Brand Cement Board is
recommended for this use. Double-layer panels are required for resilient systems. Refer to SA934, Moisture-Resistant
Assemblies, and SA927, Gypsum Panels and Accessories.
9 Fixture Attachment Lightweight fixtures and trim should be installed with toggle bolts or hollow wall anchors inserted in the base, and,
preferably, also through the stud. Wood or metal mounting strips for cabinets and shelving should be bolted to stud
framing.
10 Zinc Alloy Recommended where corrosion due to high humidity or saline content of aggregate is possible. Metal lath,
Accessories
control joints and other metal accessories, including zinc-alloy accessories, should not be used with magnesium
oxychloride cement stuccos or portland cement stucco containing calcium chloride additives.
11 Joint Treatment For steel frame systems,
SheetRock Brand eaSy SanD Lightweight or DuRabonD Setting-Type Joint Compound and
SheetRock Brand Joint Tape must be used on all joints and internal corners and allowed to set and dry before veneer
plaster application. See PM5, Veneer Plaster Joint Reinforcement Systems, for complete information.
12 Decorating Plaster systems must be completely dry before decoration.
Do not specify polyvinyl acetate (PVA) primers for application to plaster finishes containing lime. In the presence of
moisture, these primers can cause bond loss with resultant paint delamination and job failure.
Caution should be used in selection and use of epoxy-based finish systems over lime putty/gauging plaster and
lime-containing finish plasters as these high-strength coating systems create a significant degree of surface stress at
the coating/plaster interface. Use of a penetrating primer/sealer is required to adequately enhance and fortify the
plaster surface when such finish coating systems are used. In all cases, the paint manufacturer should be consulted in
selection and final application procedures.
Veneer—Painting or further decoration of all plaster finishes is recommended and should be specified. However, in
many residential applications,
DiamonD Brand Interior Finish and DiamonD Brand Interior Finish Type F Plasters provide
a uniform white color and may satisfy a job’s specific acceptance specifications when textured and left undecorated.
impeRial Finish Plaster and DiamonD Brand Interior Finish Plasters, if completely dry, may be painted the day after appli-
cation with acrylic, latex or vinyl-breather-type paints.
Conventional—Gauged-lime putty and
ReD top Brand Finish applied over conventional basecoat plasters must age
30 days and be thoroughly dry and properly sealed before decorating. Quick-drying vinyl acrylic latex or alkali-resistant
alkyd primer-sealers are recommended.
Refer to PM15, Painting Plaster, for complete recommendations on priming and painting. For information on
decorating with color-enhanced finish plaster, see P759, Decorative Interior Finish Systems.
13 Sound Control Sound tests are conducted under ideal laboratory conditions per ASTM procedures. Comparable field performance
depends on building design and careful attention to detailing and workmanship. Where these partitions are used for
sound control, seal the partition perimeter with 1/49 min. round bead of
SheetRock Brand Acoustical Sealant. Seal
around all cutouts for lights, cabinets, pipes, ducts and electrical boxes. Back-to-back penetrations of the diaphragm,
flanking paths and door and borrowed-light openings should be avoided. Where sound isolation is the primary
consideration, only sand-aggregated basecoat plasters should be used.
8 Ceramic Tile impeRial Brand Gypsum Base and Rocklath Plaster Base are not recommended as a base for the adhesive application
of ceramic tile and plastic-faced panels.
FibeRock Brand aqua-touGh Tile Backerboard or DuRock Brand Cement Board is
recommended for this use. Double-layer panels are required for resilient systems. Refer to SA934, Moisture-Resistant
Assemblies, and SA927, Gypsum Panels and Accessories.
9 Fixture Attachment Lightweight fixtures and trim should be installed with toggle bolts or hollow wall anchors inserted in the base, and,
preferably, also through the stud. Wood or metal mounting strips for cabinets and shelving should be bolted to stud
framing.
10 Zinc Alloy Recommended where corrosion due to high humidity or saline content of aggregate is possible. Metal lath,
Accessories
control joints and other metal accessories, including zinc-alloy accessories, should not be used with magnesium
oxychloride cement stuccos or portland cement stucco containing calcium chloride additives.
11 Joint Treatment For steel frame systems,
SheetRock Brand eaSy SanD Lightweight or DuRabonD Setting-Type Joint Compound and
SheetRock Brand Joint Tape must be used on all joints and internal corners and allowed to set and dry before veneer
plaster application. See PM5, Veneer Plaster Joint Reinforcement Systems, for complete information.
12 Decorating Plaster systems must be completely dry before decoration.
Do not specify polyvinyl acetate (PVA) primers for application to plaster finishes containing lime. In the presence of
moisture, these primers can cause bond loss with resultant paint delamination and job failure.
Caution should be used in selection and use of epoxy-based finish systems over lime putty/gauging plaster and
lime-containing finish plasters as these high-strength coating systems create a significant degree of surface stress at
the coating/plaster interface. Use of a penetrating primer/sealer is required to adequately enhance and fortify the
plaster surface when such finish coating systems are used. In all cases, the paint manufacturer should be consulted in
selection and final application procedures.
Veneer—Painting or further decoration of all plaster finishes is recommended and should be specified. However, in
many residential applications,
DiamonD Brand Interior Finish and DiamonD Brand Interior Finish Type F Plasters provide
a uniform white color and may satisfy a job’s specific acceptance specifications when textured and left undecorated.
impeRial Finish Plaster and DiamonD Brand Interior Finish Plasters, if completely dry, may be painted the day after appli-
cation with acrylic, latex or vinyl-breather-type paints.
Conventional—Gauged-lime putty and
ReD top Brand Finish applied over conventional basecoat plasters must age
30 days and be thoroughly dry and properly sealed before decorating. Quick-drying vinyl acrylic latex or alkali-resistant
alkyd primer-sealers are recommended.
Refer to PM15, Painting Plaster, for complete recommendations on priming and painting. For information on
decorating with color-enhanced finish plaster, see P759, Decorative Interior Finish Systems.
13 Sound Control Sound tests are conducted under ideal laboratory conditions per ASTM procedures. Comparable field performance
depends on building design and careful attention to detailing and workmanship. Where these partitions are used for
sound control, seal the partition perimeter with 1/49 min. round bead of
SheetRock Brand Acoustical Sealant. Seal
around all cutouts for lights, cabinets, pipes, ducts and electrical boxes. Back-to-back penetrations of the diaphragm,
flanking paths and door and borrowed-light openings should be avoided. Where sound isolation is the primary
consideration, only sand-aggregated basecoat plasters should be used.