Window Fitters Guide to Window Installation 
99               ©2022 AWDI, LLC Do not reproduce without permission
Step 7:
If the house wrap has
been moved aside, it
can now be un-taped
and placed over the
second layer of self-
adhesive flashing to
complete the installa-
tion.  Again, take care
to leave the bottom free
for drainage into the
drainage plane.
Step 5:
Anchor window
through mounting
flange slots on all
sides. Use Simplex 
Cap Nails on Header.
Lightly nail through
slots in fin. Do not
nail tightly.
Step 8:
Once the drip cap is
installed and the window
is seated in the opening,
plumb and square, the
top layer of the adhesive-
backed flashing can be
applied.
The surface flashing is
applied to the jamb sides
first, overlapping the sill
pan, weep screen and sill
flashing assembly.
The header flashing is
applied over the top
fin/flange of the window
and overlaps the jamb
flashing.
The bottom is kept free
to allow drainage of any
water penetration into
the drainage plane.
Step 6:
A drip cap should be
used across the header
of the of the installed
window/door.  Often, “J-
Channel”, when used
with siding is thought to
be a drip cap. 
Do not rely on the work
of others . Bend a cap or
used the supplied cap
and install on top of the
window/door using
sealant.
Simplex Cap
Nails OVER fin
allows frame to
move better than 
nails through
mounting slots
Mount the Window (Method B)
Nailing fin 
Drip cap 
Window 
frame 
SAMPLE MANUAL

View this content as a flipbook by clicking here.