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Old 05-18-2014, 08:26 PM   #1
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installing plywood as subfloor in basement.


My father wants to install plywood as a subfloor in the basement. I have never seen plywood installed on top of concrete in a basement.

I just want to know if this is a good idea? Are their any problems that might occur from installing plywood as a subfloor?

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Old 05-18-2014, 08:32 PM   #2
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installing plywood as subfloor in basement.


Bad idea. Only way that I would ever consider doing that is if I put two byes on edge in a frame first and then floor on top of that. Ron

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Old 05-18-2014, 09:07 PM   #3
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installing plywood as subfloor in basement.


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My father wants to install plywood as a subfloor in the basement. I have never seen plywood installed on top of concrete in a basement.

I just want to know if this is a good idea? Are their any problems that might occur from installing plywood as a subfloor?
Every time I have seen that done, it failed.
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Old 05-19-2014, 11:11 AM   #4
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installing plywood as subfloor in basement.


Only way I would ever do it is if it was over a product such as Dri-Core.
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Old 05-20-2014, 12:31 AM   #5
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installing plywood as subfloor in basement.


You could do it with Platon. Its a dimpled plastic membrane commonly used for foundation waterproofing. Would be essentially the same as dricore panels, but more solidly attached (you'd have to drill and use tapcons). Only reason I see to do this is to use a nail-down solid wood floor which aren't really supposed to be used below grade anyway.
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Old 05-20-2014, 07:56 AM   #6
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installing plywood as subfloor in basement.


Every hole you put in it for tapcons, allows moisture through.
Just because these home improvement shows do it, doesn't mean it's right. A lot of the stuff done on those shows is wrong. I seldom see anyone do floorcovering right on HGTV.
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Old 05-20-2014, 09:58 AM   #7
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installing plywood as subfloor in basement.


If you tape down a piece of plastic in a spot you will see for yourself how much moisture migrates through concrete.
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Old 05-20-2014, 10:47 AM   #8
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installing plywood as subfloor in basement.


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Every hole you put in it for tapcons, allows moisture through.
Just because these home improvement shows do it, doesn't mean it's right. A lot of the stuff done on those shows is wrong. I seldom see anyone do floorcovering right on HGTV.
The idea isn't to have a moisture barrier. Its to have a vapor retarder. The goal with this if the idea is to install a solid wood floor, is simply to slow down the transmission of moisture between the substrate and the wood. It also allows air under the plywood so it doesn't trap moisture and provides a bit of a thermal break from the concrete for a warmer floor. If the OP plans on a floating floor or tile or something else, there are better ways of going about it. Its just one of many methods. And I've never seen this method on a DIY show. You're right though, they seldom get things right.
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Old 05-20-2014, 10:58 AM   #9
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installing plywood as subfloor in basement.


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If you tape down a piece of plastic in a spot you will see for yourself how much moisture migrates through concrete.
False

That only tells you if the concrete surface has reached dew point temperature.
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Old 05-20-2014, 11:10 AM   #10
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installing plywood as subfloor in basement.


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False

That only tells you if the concrete surface has reached dew point temperature.
If the concrete is at dew point then the entire floor would be damp with condensate from the AIR. By sealing the section of floor with plastic you remove air from the equation. Also any water vapor that is coming from the floor is trapped and builds up to quickly saturate the sealed area and condense into visible moisture.

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