Pella 80WX0101 Window User Manual


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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. Insulate between new frame andtheexistingframewithlow
expansioninsulatingfoam.FROMTHEEXTERIORinsertthe
nozzleoftheapplicatorapproximately1"fromtheinteriorstop
andapplya1"deepbeadoffoam.Thiswillallowroomforthe
expansionofthefoamandwillminimizesqueezeout.Follow
foam manufacturer's instructions.
Note: Masking between the window and the existing
interior stop will help alleviate possible squeeze out
of the expandable foam to the interior.
B. Check the window operation by opening and closing
the window. If bowed, remove foam with a serrated
knife, then check operation. If still bowed, adjust shims as
needed, then insulate as instructed in previous step.
C. Inspect the interior and carefully trim all excess foam sealant if needed.
6 EXTERIOR SEAL
A. Insert backer rod into the space around the window
at the head and jambs. 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.
Caution: DO NOT seal the bottom exterior
to allow for incidental water to weep.
C. 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
EXTERIOR
5A
Theexposedwoodontheexteriorstopneedstobecovered/
protected. There are many ways to accomplish this, and each case
can be unique.
EXTERIOR FINISH OF EXISTING FRAME
EXTERIOR OF WINDOW
WITH FRAME EXPANDER
A few possibilities include:
a)Coveringtheexistingtrimwithaluminumcoilwrap/
frameexpander.
b)Sanding,primingandpaintingtomatchexistingtrim.
c)Coveringtheexposedwoodwithahighqualityexterior
grade sealant.
Note: The contractor/installer will determine how to
finish the exterior.
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