The Contractor's Guide to installing Vinyl Windows                            44                ©2022 AWDI, LLC Do not reproduce without permission
Step 1:
Using a reciprocal
saw, cut the old 
window out 
without disturbing
the exterior.
Step 2:
After removing 
the window, do your
best to clean the gap,
injecting a small bead
of foam behind the
siding. You can wrap
some flashing over the
gap. Try to direct any
water from going
behind the siding.
Step 3:
You can line the 
opening with water
resistant pvc trim
board and mount 
the window or use a
pre-extruded liner
with built-in exterior
stop, as shown, and
finish with drip cap
and sealant.
Cut Out Old Window, Leaving the Fin
Very often, the old 
window is cut out -
(through the old fin)
leaving the fin in
place. This is very
common where “J”
Channel was used 
to trim out the siding.
The goal is to leave as
much of the exterior
and interior trim in
place and minimally
patch and/or repair. 
If done with care, the
new window (a box
frame window) can be
inserted in the open-
ing and trimmed with
minimal damage to
the existing opening.
This would work if the exposed space between the
siding and the interior wall board, containing the
original flashing and insulation, is isolated from
water intrusion, and accommodating drainage of any
water or moisture condensation in so that it will not
collect in the opening cavity. The best approach is to
use a liner and seal behind/under the liner.
SAMPLE MANUAL

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