Window Fitters Guide to Window Installation 
41                ©2022 AWDI, LLC Do not reproduce without permission
Step 5:
Re-establish 
jamb and header
flashing using 
adhesive-backed
flashing or liquid
applied flashing.
Where adhesive-
backed flashing is
used, overlap the sill
flashing with the
jamb flashing, and
overlap the jamb
flashing with the
header flashing.
Step 6:
Set the new window in
place. Carefully shim
to leave drainage
space at sill and make
new window plumb,
square and level.
Carefully fasten being
careful not to nail the
new window too tight. 
Use Simplex (or equal)
cap nails at header to
allow expansion.
Step 7:
Apply new pvc trim
casing over flashed
fin on header and
jambs and then seal. 
Trim placed along 
bottom must allow
drainage of any
water that may 
accumulate in sill.
Step 7:
Apply Adhesive-backed
flashing over fin and
tuck under siding.
Place Drip Cap on top.
Simplex Cap Nails OVER 
fin allows frame to move better
than nails through mounting slots
Drip cap 
Window 
frame 
SAMPLE MANUAL

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