Window Fitters Guide to Window Installation 
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Step 3:
Using another layer
of flashing, starting
with the sill, overlap
strips to cover the
jambs and header
also.
If you choose to
apply building paper,
start the first strip
tucked under the
bottom (sill) flashing.
The goal is always to
overlap in ship lap
fashion to direct
water down and
away from the new
window.
Step 4:
Finish installing the
overlapping building
paper.
Remember to leave
the bottom of the
window unsealed to
allow drainage of any
water or condensed
moisture in the
opening cavity.
Step 5:
Integral J-Channel
frames allow 
installation of the
siding by “tucking”
it inside the space 
created by the j-
channel and the
window frame.
Step 6:
Finish applying the
exterior siding or
paneling - or even
stucco.
Proper drainage and
finish trim all in one
application.
Integral J-Channel Install
SAMPLE MANUAL

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