Interior seal – Pella Impervia 802Q0101 User Manual

Page 4

INTEGRATING THE WINDOW TO THE WATER RESISTIVE BARRIER

A. Apply side flashing tape. Cut two pieces of flashing

tape 4" longer than the frame height of the window.

Apply one piece to each side 1/2" onto the frame,

over the nailing fin and onto the water resistive

barrier. The tape should extend 2" above the top

of the window and 2" below the bottom of the

window. Press the tape down firmly while folding

down the excess tape at the top and bottom of the

window.

B. Apply top flashing tape. Cut a piece of flashing tape

long enough to go across the top of the window and

extend at least 1" past the side flashing tape on both

sides. Apply the tape 1/2" onto the frame, over the

top nailing fin as shown. Fold the overlapping tape

down, and press all tape down firmly.
Note: DO NOT tape or seal the bottom nailing fin.

C. Fold down top flap of the water resistive barrier.

D. Apply flashing tape to diagonal cuts. Cut pieces of

flashing tape at least 1" longer than the diagonal cuts

in the water resistive barrier. Apply the tape covering

the entire diagonal cut in the water resistive barrier

at both upper corners of the window.
Note: Be sure to overlap the top corners.

INTERIOR SEAL

Caution: Ensure use of low pressure polyurethane window and door insulating foams and

strictly follow the foam manufacturer’s recommendations for application. Use of high pressure

foams or improper application of the foam may cause the window frame to bow and hinder

operation.

A. Apply insulating foam sealant. From the interior, insert

the nozzle of the applicator approximately 1" deep into the

space between the window and the rough opening and apply

a 1" deep bead of foam. This will allow room for expansion

of the foam and will minimize squeeze out. If using foam

other than Great Stuff

™

Window and Door Insulation Foam

Sealant by the Dow Chemical Company, allow the foam to

dry completely (usually 8 to 24 hours) before proceeding to

the next step.
Note: DO NOT completely fill the space from the back of

the fin to the interior face of the opening.

B. Check window operation (vent units only) by opening and closing the window.

Note: If the window does not operate correctly, check to make sure it is still plumb, level,

square and that the sides are not bowed. If adjustments are required, remove the foam

with a serrated knife. Adjust the shims, and reapply the insulating foam sealant.

Interior View