3.6.7
Application Time Limits
Do not start foam application on an area larger than can be brought to the
specified full foam thickness, cured, and coated with the base coat of the
coating system on the same day. No applied foam, except for leading edges,
shall stand uncoated overnight. Inspect the leading edge of foam before
resuming work the next day. Remove and replace damaged or wet foam
material.
3.6.8
Curing Time
Cure the applied foam for a minimum of 2 hours and as otherwise recommended
by the foam manufacturer prior to application of the protective coating.
3.6.9
Spray Foam Clean Up
Remove overspray masking materials and coverings upon completion of the
spray foam application and prior to the application of the protective
coating. Do not remove the masking over air intake vents until two hours
after application of the foam. Remove foam overspray found on adjacent
surfaces not scheduled to application of the protective coating.
3.7
SURFACE PREPARATION FOR PROTECTIVE COATING APPLICATION
Apply roof coating on surfaces free of water, grease, oils, dirt, debris,
and other foreign materials, and cured completely. Foam surfaces to
receive coating shall be as specified.
3.7.1
[Metal] [Concrete] [and] [Masonry] Surfaces
[Clean rust and scale from metal surfaces which are to receive roof
coatings by abrasive cleaning or wire brushing. Wipe with an industrial
solvent such as naphtha or mineral spirits.] [Wire brush [concrete] [and]
[masonry] surfaces which are to receive roof coatings, and remove resulting
dust.]
3.7.2
Primer
Apply as recommended by the coating manufacturer.
3.7.3
Sealant
Apply as recommended by the coating manufacturer to include application in
V-groove at eave and rake terminations.
3.8
PROTECTIVE COATING APPLICATION
Apply protective coating on foam insulation not less than 2 hours after but
on the same day as installation of the foam insulation. Do not leave foam
uncoated overnight. Apply coating on insulation, and continue up walls and
roof penetrations to a point indicated, but not less than 50 mm (2 inches)
beyond foam termination where conditions will allow. Provide terminal
edges of the foam at roof penetrations, terminations, and roof edges with
an extra base coat back 100 mm (4 inches) from the edge of the foam and
onto adjacent substrate surface. Check roof coating wet film thickness
during application to ensure that the wet mil thickness required for each
coat is provided. For each coat, provide a dry film thickness not less
than specified in paragraph entitled "Minimum Dry Film Thickness (DFT) in
Mils." Provide smooth coatings free of runs, dry spray, or overspray, and
SECTION 07570
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