5
INTERIOR SEAL
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.
From the interior, 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. Apply sealant across interior surface of shims
to create a continuous seal. For windows with jamb
extensions installed, ensure the foam is placed between
the window frame and the rough opening, not between
the jamb extension and the rough opening. Follow foam
manufacturer’s instructions.
B.
Check the window operation
(vent units only) by opening and closing the window.
Note: If the window does not operate correctly, check to make sure it is still plumb, level,
square, and the jambs are not bowed. If adjustments are required, remove the foam with
a serrated knife. Adjust the shims and reapply the insulating foam sealant.
6
EXTERIOR SEAL
A.
Insert backer rod
into the space around
the window. This should provide at least
3/8" clearance between the backer rod
and the exterior face of the window.
Note: Backer rod adds shape and depth
for the sealant line.
B.
Place a bead of sealant
at the jambs and
head between the existing window frame
and the replacement window frame.
C.
Begin the sill sealant bead
1/2" from one jamb, running it across the
sill and stopping 1/2" from the opposite jamb. This 1/2" sealant gap
on each side of the sill allows for incidental water drainage.
D.
Shape, tool, and clean excess sealant.
When finished, the sealant should be the
shape of an hourglass.
Note: This method creates a more flexible sealant line capable of expanding
and contracting.
EXTERIOR
6A
6B
5A
Interior Finish or Trim:
The space between the new window and the existing window’s
frame will need to be covered with trim. There are many ways to accomplish this and each
case can be unique. How this is done will be the decision of the homeowner or window
installer. A few possibilities include using cove, quarter round, or a stop moulding.
