Window Fitters Guide to Window Installation 
127              ©2022 AWDI, LLC Do not reproduce without permission
Step 3:
Install a window buck, 
receptor or device
which will act as a
mounting surface on
both sides and the top
for the seating of the 
window into the
masonry cavity.
Apply a 9 mm 
(3/8 inch) bead 
of bedding sealant or
appropriate gasket
under the buck
material to prevent
the passage of water
behind the buck.
Align Head Buck with
Sill Detail. The outer-
most edge of the jamb
and header bucks will
align with the outer-
most edge of the sill
buck and/or pan.
Step 1:
The Opening must be
level, plumb and
square, and the mortar
properly applied to
allow no voids, cracks
or clumps that might
allow water infiltration.
A proper sill must be
accommodated either
with a pre-cast sill, or
an applied buck with a
sill pan installed as
shown.
Note: Florida Building
Code Requires that 
products tested for wind
and debris - especially for
hurricane and high wind
zones - be installed as
they were tested. 
This can mean anything
other than a wood buck
sill can void hurricane
and wind approvals.
Exterior
Step 2:
It is recommended that
installer treat the
masonry opening with a
CMU sealer for the 
purpose of sealing the
CMU window cavity
from absorbing liquid
water.  This application
will be put on before
the installation of the
buck materials. 
Mark set-back for buck
on jambs and header.
Step 4:
Assure there are no
gaps between bucks
when anchoring bucks
to CMU opening
Note: The number, type and
spacing of fasteners required
for installation of the bucks is
in accordance with local code. 
The coatings will need
to be extended onto the
sill member, ensuring
100% continuity
between the buck and
the sill member, with
no air or water gaps.
Precast
Lintel
Poured
Sill
Coastal CMU Installation with Installed Buck
Exterior
Exterior
Exterior
SAMPLE MANUAL

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