Pella Precision Fit - Manual (Page 9)

Sill
Stool
3B
7
PREPARE THE OPENING (CONTINUED)
FIXED WINDOW REPLACEMENT
D. Trim the sill adapter to the proper
height by breaking off the grooved leg
at the desired dimension (see chart).
Once trimmed, apply a bead of sealant
to the sill adapter. Attach the sill
adapter into the sill by using a board
and hammer.
Note: Scoring the leg groove multiple
times at the desired dimension with
a utility knife will help the leg break
easier. The sill adapter may also be
trimmed to correct dimension using
a table saw.
5/16” - 3/8”
7/16” - 1/2”
9/16” - 5/8”
11/16” - 3/4”
13/16” - 7/8”
15/16” - 1”
Sealant goes here
Score leg at desired dimension.
Use pliers to break off leg.
8
SEALING AND FASTENING
THE WINDOW
B. Place a bead of sealant where the existing stool meets
the existing frame sill and jambs
C. Insert window into the opening, placing the bottom of
the window on the spacers at the bottom of the opening
and tilting the top into place. Make sure the window
is up against the existing stool. Center the window
between the sides of the opening to allow clearance for
shimming and partially drive one of the top attachment
screws (factory provided in the unit) halfway in to hold
the window in place while shimming it plumb and
square.
D. Place shims 1” from the bottom and top of the
window between the window and the sides of the
opening. Adjust the shims as needed to plumb and
square the window in the opening. Also shim slightly
above the partially driven (factory supplied) attachment
screws in the jambs. If the shims are aligned with the
attachment screws, the frame may bow away from the
shims when driving the screws.
Note: DO NOT shim above the window or in the space
between the spacers at the bottom of the window. DO
NOT over shim.
3B
8B
8D
2E
Sill Adapter
Sealant
7D
A. Apply a 3/8" continuous bead of sealant to the interior
face of the existing blind stops at the head and both
jambs.
Note: Sealant bead placement is critical to ensure
contact with replacement window
3A
Jamb
blind
stop
Head blind
stop
8A