FIN MOUNTED WINDOW 
Frame Cut-Out
Box Frame
Mounting Fin Cutout. 
Sawsall cuts through nailing
fin of old window on all 4-
sides. The fin remains are left
in place. A block is used to
make an interior “stop” and
the new window is installed
from the outside against the
stop. Backer Rod and
sealant, J-Channel or cap-
ping is installed to seal the
outside.
UNIVERSAL FIN WINDOW REPLACEMENT 
Box Frame Pocket Install
Box Frame
Creating Blindstop
Rather than saws-all cuts
around old window to leave the 
fin in place, removing old trim 
and siding to expose the old 
finned window allows full removal. 
Replacing the removed trim 
and/or siding with new trim, 3/8” 
wider, to project into the opening, 
creates a “blindstop” allowing a 
Pocket Install from the inside. 
Using shims under the window 
and cap nails to secure the sill 
flashing in place provides 
proper, functional drainage.
Wood Frame-In or Frame-Out
Wood Openings 
Whether the old 
window frame is left
in or removed, a pvc
liner works like a
receptor system. 
The liner can be
installed plumb 
and square with all
weather barriers 
re-established. Then
the new window is
installed into the
liner weather tight.
Concrete Frame-In
Masonry 
Openings
When windows 
are installed into 
masonry openings 
of block and stucco,
removal leaves a mess
that’s difficult to make
weather tight. A rigid liner
system can overcome the
destruction of removal 
and allows a good 
performing installation.
OPENING LINER 
CBS METAL WINDOW
Windows set in Concrete Block Stucco Wall
Frame-Out
Frame-In
Wood Buck Surround
The old frame is removed, 
exposing the wall gap 
between the stucco 
coating and the interior. Tapered
wood bucks are fastened to the
underlying block walls with cement
nails to provide a secure mounting
surface. The wood bucks are
applied along header and jambs.
Any gap in the sill can be filled
with quick-set compound (fast 
drying leveling cement) to make
sure a level surface is 
provided for the sill buck, 
unless it’s a pre-formed 
sill with taper. 
Butt to old frame 
fromExterior
All panels are removed down to
the left-in-place frame. The new
window, unequal legged,  is
mounted against the old frame
from the outside to make a
weathertight installation with
the new window covering the
old frame. Wood or cellular pvc
trim blocks can be applied on
the inside to level out the space
between the new window and
the old sheetrock return, and
allow trim to be applied to 
finish the install.
©1990-2022 AWDI, Inc. All Rights Reserved
NOTE: Drawings are not necessarily to scale or representative of any particular window type or opening. They are for guidance. Actual situations and products may vary. Quality Sealants and Low Expansion
gunnable Foam can be used where indicated to seal against water penetration and insulate against air and moisture penetration as long as the 5 Barriers are properly reconstructed and reconnected.
SAMPLE MANUAL

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