Pella 80WX0101 - Manual (Page 4)

EXTERIOR
4D
4C
A. If the existing double-hung has a sloped sill the sill of the new window will need to
be supported by using the Pella replacement sill adapter accessory or by using wood
blocking as needed.
4
SETTING AND FASTENING THE WINDOW
Sill
Adapter
(SILL CUTAWAY VIEW)
Double-Hung Sill
Sill
Adapter
(SILL CUTAWAY VIEW)
Casement Sill
4B 4B
B. If using the Pella replacement sill adapter accessory the sill adapter will need to
be cut to the same length as the sill of the window and slid into the sill fin groove. This
adapter may be adjusted to accommodate different sill angles by breaking off the
grooved leg at the desired dimension. Dry fit the window to ensure the window will fit
in the opening and that the sill adapter is trimmed properly.
C. Apply a 3/8" bead of sealant at the point where
the existing stool meets the existing window sill.
Additionally, place sealant at the ends of the flashing tape,
making sure to connect with the stool sealant.
D. Apply a continuous 3/8" diameter bead of sealant at
the exterior surface of the interior head and jamb stops.
Connect this bead of sealant to the sealant line on the stool.
E. Insert the replacement window in the opening. Check to make sure the window rests
against the interior blind stops and is making contact with the sealant.
TWO OR MORE PERSONS ARE REQUIRED FOR THE FOLLOWING STEPS.
F. From the exterior, place shims near the top of one jamb, in line with the top pre-
drilled hole in the window frame. Partially insert one 3-1/4" finish wood screw. Repeat the
process for the other jamb.
Note: Position shims to ensure they allow at least 1/2" from the exterior surface of
the window to allow for placement of backer rod and sealant.
G. Continue placing shims at each pre-drilled hole as needed to plumb and square the
window. Check window for squareness by making sure the diagonal measurement from
corner to corner of the replacement window is within 1/8" in both directions. Insert a
3-1/4" finish wood screw into each pre-drilled hole in the frame. Finish inserting the top
screw in each jamb.
Note: DO NOT shim above the window. DO NOT over shim!
H. Check operation before applying the insulating foam sealant in case adjustments need
to be made.