Ensure that [curbs,] [roof penetrations,] [drains,] [equipment supports,]
[cants,] [control joints,] [expansion joints,] [perimeter walls,] and
perimeter foam stops are in place prior to the application of the [primer
and] spray polyurethane foam.
3.3.1.1
Surface Examination
Examine surfaces and correct defects that may adversely affect the roofing
system application or performance.
3.3.2
Close Intake Vents
**************************************************************************
NOTE: Specify whether ventilation shutdown will be
required during the roof system application.
Reroofing projects require closer attention to this
issue. Delete "shutdown" if job is new construction
and the ventilation system is not being used.
Shutdown of the ventilation equipment is necessary
to avoid drawing fumes into interior spaces. Where
loss of air conditioned rooms is critical, portable
ventilation and air conditioning units shall be
specified.
**************************************************************************
Seal off [and shutdown] air intake vents during foam and coating
application. Coordinate with the Contracting Officer. [Give the
Contracting Officer 7 days notice before shutting down ventilation
equipment.] [Provide portable ventilation and air conditioning during
shutdown [as required by the Contracting Officer][to Room [_____].]]
3.4
GENERAL APPLICATION
Application shall be as specified and in general accord with requirements
and recommendations of ASTM D 5469 and NRCA RWM "Quality Control Guidelines
in the Application of Spray Polyurethane Foam Roofing".
3.5
SURFACE PREPARATION FOR FOAM APPLICATION
Surfaces that are to be primed or receive spray foam application shall be
dry; completely cured; free of grease, oils, dirt and other foreign matter
or contaminants which will interfere with total adhesion of primer and
polyurethane foam. Prior to foam application, fill or otherwise seal
openings where foam spray may damage or contaminate interior items or
surfaces.
[3.5.1
Ferrous Metal
Sandblast iron and steel surfaces which are not primed, shop painted, or
otherwise protected in accordance with SSPC SP 6. Remove loose rust and
unsound primer from shop-primed iron and steel surfaces by scraping or wire
brushing.
][3.5.2
Concrete Decks
Remove spalling and loose material from the concrete deck and prime, if
required, in accordance with recommendations of the manufacturer of the
spray polyurethane foam materials.
SECTION 07570
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