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Old 01-05-2015, 09:47 AM   #1
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anchoring a basement subfloor


I've kind of read mixed things so far....I know some don't approve of wood subfloors in basements, but if I went ahead anyways, does it need to be anchoring.

The subfloor in question is either ply or osb overtop of DMX underlayment, which will only have carpet and laminate on top.

Does each sheet of ply/osb need to be screwed to the basement floor, if so, how many anchors are required.

I'm trying to avoid putting a whole bunch of holes in the DMX underlayment.

Thanks,
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Old 01-05-2015, 01:05 PM   #2
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Laminate is not warrantied in a basement. Doesn't matter what you put under it. No idea why you would want wood under carpet in a basement.
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Old 01-05-2015, 01:37 PM   #3
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You should have at least used some 2X sleepers under the ply.You don't want the ply sitting on the concrete.DMX or whatever.Your going to have to anchor the ply somehow putting holes thru the dmx making it useless with the ply sitting right on top.
Also agree with Rusty on the rest.
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Old 01-05-2015, 01:37 PM   #4
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Quote:
Originally Posted by rusty baker View Post
No idea why you would want wood under carpet in a basement.
According to the DMX installation instructions, 5/8" T&G OSB is required for carpet.
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Old 01-05-2015, 01:41 PM   #5
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Quote:
Originally Posted by mako1 View Post
You should have at least used some 2X sleepers under the ply.You don't want the ply sitting on the concrete.DMX or whatever.Your going to have to anchor the ply somehow putting holes thru the dmx making it useless with the ply sitting right on top.
Also agree with Rusty on the rest.
DMX is similar to delta-fl...the OSB/ply wouldn't be touching the concrete.

I've read that laminates can float on top of a floating subfloor, and I know that the OSB is required for carpet...but is there any reason why the entire subfloor can't float?

Will the carpet develop any ridges or anything like that if the subfloor is floating?
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Old 01-05-2015, 02:47 PM   #6
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I don't know where you read about a "floating subfloor".I've been in the business for 40 years and never heard such a thing.OSB or Plywood does expand and contract.
Sounds like your set on it so go ahead .When the osb starts to swell up like a biscuit and the edges start to curl up come back for some more advice on how to do it right.
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Old 01-05-2015, 03:07 PM   #7
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Well...I'd like to keep the DMX there...what is the better solution? Just laminate on top of the DMX without the OSB/ply? (forget the carpet?)
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Old 01-05-2015, 03:27 PM   #8
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Laminate is not for below grade no matter how you install it.
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Old 01-05-2015, 05:56 PM   #9
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Which laminate are you planning to use? Have you done a moisture test? Which one? You forgot to say where you're located. I would think a question about moisture and below grade floor finishing would require a rough location to help us get an idea of the weather conditions. You should insert it in your profile.

What you wanna do is a high risk installation for most locations. It can work fairly well, but only if all the stars align and the conditions don't change.

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