How to Flash a Window | This Old House

This Old House general contractor Tom Silva shows how to fabricate custom-fit aluminum window flashing. (See below for a shopping list and tools.)
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Shopping List for How to Flash a Window:
- 8-inch-wide aluminum flashing, used to make Z-flashing
- two beveled 2x8, used to bend flashing with homemade jig
- 2x4 tapping block, used with homemade bending jig
- wood gauge block, used to represent the thickness of the window casing and trim

Tools for How to Flash a Window:
- metal brake or homemade bending jig, used to bend aluminum flashing into Z-flashing
- framing square, used to mark straight lines onto the flashing
- utility knife, for scoring lines onto flashing
- hammer, used to strike tapping block
- clamps, used to hold together homemade bending jig
- aviation snips, used to cut aluminum flashing to length

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How to Flash a Window | This Old House
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