Pella Impervia 802Q0101 - Manual (Page 5)

5
SEALING THE WINDOW TO THE EXTERIOR WALL CLADDING
When applying siding, brick veneer or other exterior finish material, leave adequate space
between the window frame and the material for sealant. Refer to the illustration that
corresponds to your finish material.
Note: The sealant details shown are standard recommendations from the sealant industry.
Contact your sealant supplier for recommendations and instructions for these and any other
applications.
A. Insert closed cell foam backer rod into the space around the window as deep as it will go.
This should provide at least a 1/4” clearance between the backer rod and the exterior face of
the window.
Note: Backer rod adds shape and depth for the
sealant line.
B. Apply a bead of high quality exterior grade sealant
to the entire perimeter of the window.
C. Shape, tool and clean excess sealant. When finished,
the sealant should be the shape of an hourglass.
Note: This method creates a more flexible sealant
line capable of expanding and contracting.
5A
5B
VINYL/STEEL
SIDING
Insulate
and seal
Backer rod
and
sealant
typical
Sealant
typical
Insulate
and seal
BRICK VENEER
Backer rod
and
sealant
typical
Insulate
and seal
1/4"
1/4"
min.
WOOD
SIDING
1/4"
1/4"
min.
1/8"
STUCCO WITH
INSULATION BOARD
SOUTHWESTERN WALL
WITH STUCCO
1/4"
1/4"
min.
1/4"
1/4"
min.