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Old 07-25-2011, 01:42 PM   #1
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Protecting exposed subfloor from build up of water


Hi all,

Im looking for a method to keep water from accumulating on a platform-like-floor-system I just built. The platform will eventually have a small cabin sitting on top of it, but that cabin wont be raised and closed in for a number of months (anywhere from 4 to 9).

My dilemma is this: The subfloor is 1" rough sawn hemlock boards, but between them and the joists is housewrap with taped seams. The joists will eventually be dense-packed with cellulose, so the housewrap will 1)help contain the cellulose when its blown, and 2)act as an air barrier. However, the hemlock boards have shrunk considerably since they were laid down, which has opened up fairly significant gaps between them (1/2" in the most dramatic places). Whenever it rains, water gets between the hemlock boards, and pools up on top of the housewrap. This makes it so the hemlock boards are sitting on top of and around water. I want to do something to stop this from continuing to happen.

The added layer to this dilemma is I am currently living over a portion of this platform in a canvas wall tent, so tarping the whole thing is not the most desirable option at all (dont want to live and walk on a tarp or poly all the time).

So, I'm looking for options to prevent this accumulation of water. Here are the options I can think of:

1. Tarp the whole thing once there's no water on the housewrap, and either deal with living atop it, or live somewhere else.

2. Lay down tarp everywhere but the area covered by my (large) tent in such a way that I can easily roll it up and down, so that the tarp isnt neccesarily covering the platform at all times, but only at certain times (night, rainy periods, periods of expected rain, and when we're away for extended periods of time).

3. Lay down 3/8" underlayment plywood over the whole thing, with caulked and taped seams, and put down a coat of primer or some other effective water sealer (any suggestions on what in particular?) over the whole thing. Keep it uncovered until winter approaches, and then tarp the whole thing (if there isnt a structure over it yet) before the snows come.
  • a) Would this work? Would primer or another sealer actually be able to prevent the plywood from deteriorating while exposed for a number of months?

Any other suggestions? Opinions on my current options? Personal experiences?

Any suggestions appreciated, thanks,
Dan

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Old 07-25-2011, 02:17 PM   #2
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Protecting exposed subfloor from build up of water


Get a bigger tent?

Sorry...I think I'd tarp it.

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Old 07-26-2011, 09:05 AM   #3
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Protecting exposed subfloor from build up of water


Well, thanks for the advice. I'm still doing my research on other options (better late than never I guess).
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Old 07-29-2011, 10:36 AM   #4
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Protecting exposed subfloor from build up of water


Hi,

Took off all the boards and the housewrap, let the whole thing dry out in the sun, then put on Zip Roofing Panels, because of their coating on them. Will sand it all down before putting on the finished floor if there's swelling.

Thanks for all the help.

Dan
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