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Old 04-22-2014, 10:50 AM   #1
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Window Flashing


What is the proper size of drip edge flashing for 5/4 window trim?

The flashing I find in the stores is 1.25" and hangs over the trim quite a bit. Seems like I'd need 1" considering the trim I'm using.

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Old 04-22-2014, 03:08 PM   #2
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Most drip edge flashings on windows are fabricated on site.

No real rules as long as the back edge is sealed to the sheathing and the WRB laps over it.

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Old 04-22-2014, 08:47 PM   #3
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If you cannot afford that or a metal shop fabricating it for you, I've used these on over-sized aluminum window flashing; http://www.harborfreight.com/catalog...t+metal+seamer Not on galvanized as the coating will be removed. Just bend the exterior lip almost back to flat, then move the bend-line farther inward.

Be sure to close the ends with a easy-to-do "end dams"; to prevent all the head water from directing/running down the jambs with the wind; page 8; http://www.mtcc1170.com/images/BCRainScreen.pdf Not a real "rule" just good building design.

You will probably need the seamer for your pan under the windows, with the older house and non-standard lumber sizes: http://www.buildingscience.com/docum...shing+end+dams

Gary
PS. in second link, notice the 110* for the bend for water run-off, pp. 18.
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Old 04-23-2014, 09:39 AM   #4
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Thanks. I planned on just getting some coil stock and renting a brake. I'm pretty certain I could make enough for my entire house in one or two hours
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Old 04-23-2014, 08:11 PM   #5
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Once you get going you can fly through it.
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Old 04-24-2014, 12:02 PM   #6
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They built an addition on my house but did not remove the old siding to the old part so the new part is built 3" past the old part....they added step flashing against the old siding when they put the new roof on....I could keep going but it's kind of depressing.

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