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Old 08-22-2008, 11:04 AM   #1
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beam membrane for deck


Hi
Im in the process of building a deck and was wondering if it is nessasary/a good idea to cover the top of the beams with a weatherproof membrane of some sort. The decking will be cedar and the framing ACQ so im guessing water will sit on the beams.

thx

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Old 08-22-2008, 02:31 PM   #2
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beam membrane for deck


If your beams are ACQ they're treated to take the water. There's nothing wrong with installing a strip of flashing or ice/water shield on top of them, but with treated wood it is an unnecessary step.

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Old 08-22-2008, 05:31 PM   #3
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beam membrane for deck


Not necessary on the joists.

Tho, we do install a membrane strip on joists that are doubled (New England). The reason we do that, is to keep water out, that can freeze and expand, and pull and warp the two or more boards from eachother. This is not required, just a little over kill we like to do...
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Old 08-23-2008, 06:34 AM   #4
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beam membrane for deck


Quote:
Originally Posted by AtlanticWBConst. View Post
Not necessary on the joists.

Tho, we do install a membrane strip on joists that are doubled (New England). The reason we do that, is to keep water out, that can freeze and expand, and pull and warp the two or more boards from eachother. This is not required, just a little over kill we like to do...
Nice Tip.
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Old 08-23-2008, 07:52 AM   #5
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beam membrane for deck


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Originally Posted by buletbob View Post
Nice Tip.
Sure is!
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