provide a uniform film over the foam. Coating applications shall consider
possible coverage loss due to overspray, waste, foam texture, wind, and
other factors that may affect coverage rate. Adjust methods and quantities
to provide the minimum DFT for each coating layer free of blowholes,
pinholes, voids, blisters, and other conditions detrimental to coating
performance.
3.8.1
Base Coat Application
Apply Type [A] [B] [CB] coating as the base coat. Apply in accordance with
manufacturer's printed installation instructions in a manner and rate to
provide full coverage at the specified DFT. Apply coating uniformly and in
one direction. Inspect the completed surface for blowholes, pinholes,
cracks, breaks, voids, blisters, and other defects and repair with base
coat material. Allow base coat to cure as recommended by the coating
manufacturer prior to application of intermediate coat, except that the
base coat shall cure a minimum of 2 hours. Check cured base coat to
determine dry film thickness before applying the next coat. Clean areas of
base coat which become dirty with a clean wet cloth prior to application of
intermediate coat.
3.8.2
Intermediate Coat Application
Apply Type [A] [B] [CB] coating in same manner as base coat except apply in
a direction perpendicular to the direction in which base coat was applied.
Apply intermediate coat within 48 hours of base coat application. Apply in
accordance with manufacturer's printed installation instructions in a
manner and rate to provide full coverage at the specified DFT. Allow
intermediate coat to cure as recommended by the coating manufacturer prior
to application of finish coat, except that the base coat shall cure a
minimum of 2 hours. Check cured intermediate coat to determine dry film
thickness and inspect surface for blowholes, pinholes, cracks, breaks,
voids, blisters, and other defects. Repair with intermediate coat material
before applying finish coat. If base or intermediate coat thickness is
deficient, apply additional intermediate coat prior to applying finish coat
to bring total dry film thickness up to that required.
3.8.3
Finish Coat Application
Apply Type [A] [B] [CB] [CF] coating as finish coat in accordance with
manufacturer's printed installation instructions in a manner and rate to
provide full coverage at the specified DFT, exclusive of granules. Apply
in a direction perpendicular to the direction in which intermediate coat
was applied. Provide finish coat free of blowholes, pinholes, cracks,
breaks, voids, blisters, and other defects that may affect performance,
durability, and longevity of the coating.
3.8.4
Minimum Dry Film Thickness (DFT)
**************************************************************************
NOTE: When Type CB and CF coating is used in hot
and humid climates, specify a total minimum DFT of 1
mm (40 mils) with a minimum base and finish coat
thickness of 38 mm (15 mils) each.
**************************************************************************
intermediate
Total
Type
Base Coat
Coat
Finish Coat
System
SECTION 07570
Page 34
Previous Page
