2.7.1.3
Sand and Wood Fibered Gypsum Plaster Base Coat
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NOTE:
Because of its higher cost, specify
wood-fibered gypsum plaster only when needed; e.g.,
for fireproofing.
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Mix basecoats in the proportion of 45 kg 100 lb of wood-fibered gypsum
plaster to not more than 28 l one cu ft of damp loose sand.
2.7.1.4
Sand and High-Strength Gypsum Plaster Base Coat
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NOTE:
Specify high strength gypsum plaster base
coat only where needed to withstand heavy abuse;
e.g., hospital corridors, handball courts, etc.
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Mix scratch coat in the proportion of 45 kg 100 lb of high strength gypsum
base coat plaster to not more than 56 l 2 cu ft of damp loose sand. Mix
brown coat in the proportion of 45 kg 100 lb of high strength gypsum
basecoat plaster to not more than 85 l 3 cu ft of damp loose sand.
2.7.2
Gypsum Plaster Finish Coat
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NOTE: Do not use gypsum plaster in areas where the
ceiling and walls will be subjected to frequent
moisture or wetting.
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2.7.2.1
Lime-Putty
Prepare lime-putty in accordance with the printed directions of the
manufacturer. Use putty following preparation or following a soaking
period as recommended by the manufacturer.
2.7.2.2
Lime-Putty Gypsum-Gaged (White Coat)
Use over [sand and gypsum plaster] [sand and wood-fibered gypsum plaster].
Mix finish coat in the proportions of one part of gypsum gauging plaster to
a volume of hydrated lime or lime putty.
This mix is approximately equivalent to one 45 kg 100 lb bag of gypsum
gauging plaster to:
a.
Not more than four 22.5 kg 50 lb bags of hydrated lime,
or
b.
Not more than 127 l 4 1/2 cu ft of lime putty, or
c.
Not more than 132 l 35 gal of lime putty.
2.7.2.3
Aggregated Finish Coat
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NOTE: Specify aggregated white coat where a smooth
trowel finish is required over perlite or
vermiculite base coats. Do not use smooth trowel
finish over lightweight aggregate base coat or metal
SECTION 09210
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