This Old House general contractor Tom Silva shows how to fabricate customfit aluminum window flashing. (See below for a shopping list and tools.)
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Shopping List for How to Flash a Window:
8inchwide aluminum flashing, used to make Zflashing
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 Zflashing
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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