Window Fitters Guide to Window Installation 
40               ©2022 AWDI, LLC Do not reproduce without permission
Step 2:
Remove Exterior Casing. 
Step 4:
Create Sill 
Flashing using 
adhesive-backed
flashing, and/or 
liquid applied 
flashing to cover 
the old sill and
extend up the jambs
about 6 inches.
Metal Frame-Out- Replacement Sequence
Step 3:
Removed the nails
carefully from the old
window’s fin.
Try to disrupt old
flashing as little as
possible.
Step 1:
Most original windows
with a fin have been
trimmed with applied
exterior wood trim or
casing to cover the
mounting fin and abut
the siding.
Carefully break any
sealed joints between
the casing, the siding
and the window.
If there is no casing 
and the siding butts 
to window frame using
a “J” Channel, cut-back
the siding with circular
saw or Fein Tool to
expose the old window’s
fin, and proceed the
same from there.
At the finish, use “J” Channel or 
extended leg “C” Channel to  “cap” the siding’s  
cut ends and form a joint with the new casing trim.
Removed trim will expose old 
window and its mounting fin.
SAMPLE MANUAL

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