Window Fitters Guide to Window Installation 
129                ©2022 AWDI, LLC Do not reproduce without permission
Step 10:
Using a framing square,
plumb and square the
window/door carefully.
Shim with plastic, flat,
stackable shims. Never
use tapered wood
shims.
Using proper, code
approved fasteners,
anchor window through
frame into the bucks. 
Make sure all anchors
are properly sized.  Drill
through wood buck to
at least 1-3/8” into
block for proper tap-
con anchoring.
Step 8:.
Run a continuous 
9 mm (3/8 inch) bead
of sealant up both sides
and across the top of
the inside of the flange.
Connect that bead of
sealant across any 
joinery of the window
frame at all four 
corners.   
You can also apply the
bead of sealant to the 
flashing directly.
Step 9:
Place window/door unit
into opening, pressing
flange against the 
opening to make a 
firm contact with the
sealant.
Do not run a bead of
sealant across the
inside of the bottom
flange of the window to
allow water that has
entered the window sill
to exit easily.
Make preliminary
determination of level.
Step 11:
Trim excess shim 
material flush with
exterior face of window
to ensure that shims do
not interfere with the 
application of the 
interior trim material
Take care not to crack
or split the shim.
Note: Use Fein® Tool
or similar for clean cut.
Interior
Exterior
Interior
Interior
Coastal CMU Installation with Installed Buck
SAMPLE MANUAL

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