Pella 802Q0101 Rough Opening Preparation, C. Cut the water resistive barrier

1 ROUGH OPENING PREPARATION

A.Confirm the opening is plumb and level. Note: It is critical that the bottom is level.

B.Confirm the window will fit the opening. Measure all four sides of the opening to make sure it is 1/2" larger than the window in both width and height. On larger openings measure the width and height in several places to ensure the header or studs are not bowed.

Note: 1-1/2" or more of solid wood blocking is required around the perimeter of the opening. Fix any problems with the rough opening before proceeding.

C.Cut the water resistive barrier.

Interior

1A

Interior

Water Resistive Barrier

1st cut

3rd cut

1C

2nd cut

4th cut:

Make an 8" cut up from each top corner at a 45° angle to allow the water resistive barrier to be lapped over the fin at the head of the window.

1B

Exterior

D. Fold the water resistive barrier. Fold side flaps into the opening and staple to the inside wall. Fold the top flap up and temporarily fasten with flashing tape.

E.Apply sill flashing tape #1. Cut a piece of flashing 12" longer than the opening width. Apply at the bottom of the opening as shown so it overhangs 1" to the exterior.

Note: The tape is cut 12" longer than the width of the opening so that it will extend up each side approximately 6".

F.Tab the sill flashing tape and fold. Cut 1" wide tabs at each corner (1/2" from each side of corner). Fold tape to the exterior and press firmly to adhere it to the water resistive barrier.

G.Apply sill flashing tape #2. Cut a piece of flashing tape

12" longer than the opening width. Apply at the bottom, overlapping tape #1 by at least 1". DO NOT allow the tape to extend past the interior face of the frame.

Note: The flashing tape does not need to extend all the way to the interior of the framing.

1D

1"

1E

6"

1/2"

1/2"

1F

1"

1G