Window Fitters Guide to Window Installation 
130               ©2022 AWDI, LLC Do not reproduce without permission
Step 14:
When exterior stucco
finish is applied, it is
imperative that the 
outside bottom of the
window flange is not
sealed or covered to
allow for water
drainage, do not seal
outside bottom of 
window flange.
Any finish applied 
to the sill shall not
interfere with the
drainage of liquid
water.  The water must
drain to the exterior
surface of the facade.
Step 12:
Apply backer rod and
an interior perimeter
bead of sealant or other
window manufacturer
approved material
between the window
and the substrates to
ensure a complete air
and water seal. 
Step 13:
Caulk/Seal exterior to
make sure window is
properly interfaced with
CMU Sealer and sill
pan liquid flashing -
careful not to block
either of the two 2”
drainage gaps in the sill
sealant.
Finish
Inside, tool sealant in
such a way as to not
interfere with the 
placement of any 
interior trim on the
inside of the window
masonry opening.
Outside, when placing
stucco finish, be careful
not to block drainage
from under sill.
Take care not
to let Stucco
Veneer 
Block
Drainage
Interior
Exterior
Exterior
Coastal CMU Installation with Installed Buck
SAMPLE MANUAL

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