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Caution: Ensure use of low pressure polyurethane window and door insulating foams
and strictly follow the foam manufacturer’s recommendations for application. Use of high
pressure foams or improper application of the foam may cause the window frame to bow and
hinder operation.
A. Apply insulating foam sealant (see Caution above).
From the exterior, insert the nozzle of the applicator
approximately 1" deep into the space between the
window and the rough opening and apply a 1" deep
bead of foam. This will allow room for expansion
of the foam and will minimize squeeze out. If using
insulating foam other than Great Stuff
™
Window
and Door Insulation Foam by the Dow chemical
Company, allow the foam to cure completely (usually
8 to 24 hours) before proceeding to the next step.
Note: It may be necessary to squeeze the end of the
tube with pliers to be able to insert into the space
between the jamb boards and the rough opening,
and between the head and seat board and the
rough opening.
Exterior
5A
When applying siding, brick veneer or other exterior finish material, leave adequate space
between the jamb cover and the exterior finish material for sealant.
A. Install the exterior jamb covers onto the outer two
windows. Apply a bead of sealant to the edge of the
leg that will be driven into the accessory groove. Drive
the short leg into the accessory groove using a block of
wood with rounded edges and a hammer.
B. Nail the jamb covers to the wall using one nail on
each end, and one in the center.
C. Cut two pieces of flashing tape 6" longer than the
frame height of the window. Apply the flashing tape
3" above the top of the jamb cover, overlapping it onto
the water resistive barrier.
5
INSULATING FOAM APPLICATION
6
SEALING THE BAY/BOW UNIT TO THE EXTERIOR
WALL CLADDING
6A
Double-hung bay window
Accessory groove
Exterior jamb cover
Sealant
Exterior
6B
6C