Prepare the Opening
1. Clean the opening of any debris. Cover any holes made by the
weight pulleys, etc. Remove any old screen hook eyes or other 
protruding screws or fasteners. If there are holes left by the old
weights and cords, fill the holes with batt insulation and cover 
with a thin metal plate or aluminum tape. (Fig. 6 and 6a Pg 29)
2. After you flash the opening, install the supplied Starter Strip - Sill
Angle on the outer sill, 1/8" behind the blind stop. Caulk the inside
edge of the stool  and outside along sill angle. (Fig. 7) Check Sill
slope. Make sure sill angle leg is vertical.
3. Install the
supplied head
expander on
top of the 
window. If
desired, place
fiber glass batt
insulation
between the
expander and
the window.
Try the window
to see if the
expander rests
too high. The
legs of the
expander may need to be trimmed with a razor. (Fig. 8 and 8a)
4. Caulk the inside edge of the blindstop along the top and down both
sides. Make the caulk bead about 1/8". The bead should not lay
against the window frame - just the blindstop. Place a bead of caulk
on top of the expander. (Fig. 9-10-11)
Expander
Utility
Knife
Caulk
Caulk
Inside 
House
Inside
House
Window Fitters Guide to Window Installation 
33               ©2022 AWDI, LLC Do not reproduce without permission
Fig. 7
Fig. 7A
Fig. 8a
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Caulk
IMPORTANT: Accommodating Sill Slope
When the old wood frame is left in the opening, the slope of the sill needs to be accommodated to allow
the new window to sit level. The most common slopes are 7 degrees and 14 degrees. There are 3 common
ways the bottom of the new window is “fitted” with support. Either through positioning, or trimming, the
slope of the sill support can be adjusted. Insulate under the new sill and allow drainage to the outside.
SAMPLE MANUAL

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