temperature. It should not be used in spaces where
adequate environmental control cannot be obtained.
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Do not expose the gypsum base to excessive sunlight prior to plaster
application, as bond failure of the plaster may result. Maintain a
continuous uniform temperature of not less than 10 degrees C 50 degrees F
and not more than 27 degrees C 80 degrees F for at least one week prior to
the application of veneer plaster, while the plastering is being done, and
for at least one week after the plaster is set. Shield air supply and
distribution devices to prevent any uneven flow of air across the plastered
surfaces. Provide ventilation to exhaust moist air to the outside during
plaster application and set, and until plaster is dry. In glazed areas,
keep windows open top and bottom or side to side 75 to 100 mm 3 to 4 inches.
Openings can be reduced in cold weather. For enclosed areas lacking
natural ventilation, provide temporary mechanical means for ventilation.
In unglazed areas subjected to hot, dry winds or temperature differentials
from day to night of 10 degrees C 20 degrees F or more, screen openings
with cheesecloth or similar materials. Avoid rapid drying. During periods
of low indoor humidity, provide minimum air circulation following
plastering and until plaster is dry.
[1.7
FIRE RESISTIVE CONSTRUCTION
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NOTE: For fire-resistive assemblies, drawing
details must follow the tested and approved designs.
The addition of veneer plaster to an approved
gypsum wallboard design will improve the
fire-resistive properties of the partitions. Tested
and approved designs are published by gypsum
wallboard manufacturers, Underwriters Laboratory,
and Factory Mutual, and are included in the Gypsum
Association Fire Resistance Design Manual.
**************************************************************************
Build partitions and ceilings indicated to be of fire resistive
construction in compliance with the drawings. For fire-rated assembly
comply with the specifications contained in UL Fire Resist Dir, or FM P8016
for the Design Numbers indicated.
]PART 2
PRODUCTS
2.1
MATERIALS
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NOTE: The designer must assure that the drawings
show the required thickness for gypsum base and
gypsum backing board for all application.
**************************************************************************
Conform to the requirements specified below. Miscellaneous items not
otherwise specified shall be as recommended by the veneer plaster system
manufacturer and approved prior to use. Powder driven fasteners may be
used only when approved in writing.
2.1.1
Steel Framing, Furring, and Related Items
ASTM C 645.
SECTION 09215
Page 7
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