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Cut WRB for Window Opening

0:54
2:59
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At 0:54 in

Learn window and flashing installation. Learn how to keep the water out💪 #window #flashing #learn

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What happens here

Carefully cut the window opening in the installed WRB. First, cut horizontally across the top, then cut the top corners at a 45-degree angle. Fold these corner flaps up and out of the way, securing them temporarily. Next, trim back the vertical sides of the WRB flush with the window opening. This sequence ensures proper layering for flashing later.

Goal: Create a clean opening in the WRB ready for flashing.

Tools and materials

  • Utility Knife N/A — Cutting the WRB

What they say

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you might want to use a drainable house wrap. A rain screen works by keeping a gap from the material to the house wrap. So, when water flows, it can easily flow behind this 1 mm gap. Cut your window opening. Cut your top corners. Lift it out of the way. Trim back your sides. Cut your pan flashing 6 in or higher up the side of the opening. Regardless of flashing width, be sure that you can overlap 2 in. Now you can cut out your corners.

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