How to Flash a Window | This Old House

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This Old House general contractor Tom Silva shows how to fabricate custom-fit aluminum window flashing. (See below for a shopping list and tools.)

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

About This Old House TV:
This Old House is the No. 1 multimedia home enthusiast brand, offering trusted information and expert advice through award-winning television, a highly regarded magazine, and an information-driven website. This Old House and Ask This Old House are produced by This Old House Ventures, LLC and are presented on PBS by WETA Washington, DC.

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How to Flash a Window | This Old House

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That diy sheet metal break is gonna come in handy in the future

Detroit_Playa

Tommy, you just saved my bacon! Once upon a time, you could find 1.5 inch z flashing pre-bent. Now you can't get it anywhere unless you pay through the nose and wait forever. I was ready to rent a brake to make one flashing! I didn't realize how easy it would be to make your own bending jig.

incognitotorpedo

I have renovated a few very old houses in New England over the years and I would say that one of the most important things to focus on is proper installation of lead flashings. Properly set up, it will last for ages and ages and ages. Particularly in climates that go through thaw/freeze/thaw cycles, flashing is absolutely pivotal to keep at that hard work in good shape. Flashings aren't sexy and no one tends to notice but when done correctly it's overWHELMingly useful!!

patrickgroll

Once again, Tom shows us why he is a NATIONAL TREASURE!

cabdolla

I just love this old house. Quickly answered my question AND showed me what to do!

junkintwin

I found that it works a lot better leaving it stick out a little bit from window so water drips off rather than running down the wood of window trim the paint holds up way better on the window

ranger

Thank you Tom, this tip on bending flashing is EXACTLY what I am looking for in my next project 😀

audreybowles

Any time you can make something that may require an expensive tool (like a brake) is a good day. Thanks Tommy for the tip!

electricianron_New_Jersey

Wow ! Thanks for showing me how to make my own head flashing !!

chrismagnum

Excellent professional video explaining how to DIY. Thanks for posting. Just saved me money.

Australia-kykx

It really wasn’t a video on how to flash a window. It was a video on how to make flashing. I feel like Kevin and Tommy really misled us on that title.

tywebbgolfenthusiast

wow never seen this before, this is why i love these guys

learningcoach

What kind of DIY instruction is this? You expect me to go buy a gargantuan brake?

Ohh... there's instruction for doing this without a brake?

Never mind!

Thank you :D

anochieugochuku

almost got mad that i had to buy a 7k break for a 200 dollar window. the cool thing is that i found a solution to my 2-tier flat roof gutter system. save those soda cans!

RealGame