[and high strength gypsum gaged finish] over the base coat, scratch in
thoroughly, lay on well, double back, and fill out to a true, even surface.
Allow the finish to dry a few minutes, then trowel well with water. Apply
maximum pressure in order to compact the finish coat and provide a smooth
finish free from blemishes and irregularities. Apply trowel finish coats of
gypsum-gaged lime-putty over properly prepared base coats as thin as
possible and 2 to 3 mm 1/16 to 1/8 in thick for conventional plaster
system, except as necessary in spots to level out hollows in base coat.
3.3.3.2
Keene's Cement Lime-Putty Finish Coat
**************************************************************************
NOTE: Do not use Keene's cement as finish coat over
a portland cement plaster basecoat, or on monolithic
concrete, due to the probability of unsatisfactory
bond between gypsum and portland cement materials.
**************************************************************************
Apply finish over gypsum-sand base coat only, scratch in thoroughly, lay on
well, double back, and fill out to a true, even surface. Allow the finish
to dry a few minutes, then trowel it well with water. Apply maximum
pressure in order to compact the finish coat and provide a smooth finish
free of blemishes and irregularities. Continue troweling until the finish
sets.
3.3.3.3
Gypsum Sand Float Finish Coat
**************************************************************************
NOTE: Specify type of float required to produce the
texture desired.
**************************************************************************
Apply finish over the base coat, scratch in thoroughly, lay on with a
trowel to an even surface, and then float with [_____] floats to a true,
even surface, free of slick spots or other blemishes. Apply sand float
finishes to a maximum thickness of 3 mm 1/8 in except as necessary to level
out hollow spots.
3.3.3.4
Acoustical Plaster Finish Coat
Apply finish in accordance with manufacturer's printed instructions and in
the thickness necessary to provide the sound absorption coefficient
specified, but not be less than 13 mm 1/2 in thick.
3.4
ORNAMENTAL PLASTER WORK
Complete ornamental work before the finish coat of plaster is applied to
adjoining areas. Plaster for ornamental work shall consist of a mixture
that will produce satisfactory results for the respective conditions, be
reinforced properly with fiber or zinc-coated steel wire netting as
necessary to provide permanent construction, and be rigidly secured in
place. Run plain moldings in place to templates and guides, with true
radial lines for curved work; where it is not practicable to run such
moldings, cast or run them on a bench and then secure in place firmly.
Cornices and moldings shall be straight or curved, true to line, and
corners neat.
SECTION 09210
Page 16
Previous Page
