Pella Precision Fit - Manual (Page 5)

POCKET REPLACEMENT
3C
B. Place a bead of sealant where the existing stool
meets the existing frame sill and jambs.
Note: Sealant bead placement is critical to ensure
contact with replacement window
Sill
Stool
3B
3E
3F
C. Place a bead of sealant where the jamb and sill meet.
D. Insert the window into the opening. Set the bottom
of the window in first and tilt the top into place. Make
sure the window is centered in the opening and is
pressed firmly against the exterior blind stops.
E. Place a shim at each of the top corners slightly
above the partially driven (factory supplied)
attachment screws in the jambs. NOTE: If the shims
are aligned with the attachment screws, the frame
may bow away from the shims when driving the
screws.
Drive each top attachment screws halfway
in to hold the window in place while shimming it
plumb and square.
F. Place shims approximately 5” up from the bottom of
window to plumb and square the window. Check for
squareness by making sure the diagonal measurement
from corner to corner is within 1/16” in both
directions.
For windows over 40-1/4” tall: Place an additional
shim slightly above the center anchor screws. This will
prevent the screw from cracking or breaking the shim
when driving the attachment screw.
3
SEALING AND FASTENING
THE WINDOW (CONTINUED)