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Old 12-11-2016, 06:31 PM   #1
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Basement sub floor


I'm finishing my basement. It's all concrete floor. What kind of subfloor would you all suggest? Ending will be carpet. Basement usually does not get wet. Been here 17 years did flood once sump pump went out. Other then that pretty dry. Any ideas will help


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Old 12-11-2016, 09:37 PM   #2
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Re: Basement sub floor


Where is the home? Grading, moisture content of the slab, temperature, etc. all have a contribution.
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Old 12-11-2016, 09:43 PM   #3
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Re: Basement sub floor


Hi david,
Basements and basement floors in particular can have moisture issues. Liquid water is only half of the problem. The other half which you can't see is moisture vapor and it can pass right through concrete. It becomes an issue when you contain it and allow it to accumulate, thus wet and mold. A truly dry basement can only be achieved with extensive care right from the footing up during construction. The rest of us are relegated to the task of managing that moisture vapor.

I'll give you some reading, they know a lot more about the topic than I do.
https://buildingscience.com/document...ts?full_view=1
If the link gives you trouble just search "BSD 103-understanding-basements"

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Old 12-12-2016, 08:47 PM   #4
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Re: Basement sub floor


Ok I'm in Ohio. I'm trying to decide between building a platform 2x4 with plywood on top or air gap underlayment with plywood or the plastic tiles that have plywood attached. Any suggestions.


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Old 12-12-2016, 09:01 PM   #5
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Re: Basement sub floor


The last thing you want is that musty basement smell (mold or mildew) but not all basements can get there.
How old is the house?
How long have you lived there?
Any known water problems?
Is the landscaping around the house slopped well away from the foundation?
Are your walls bare concrete of have they been insulated and finished?

The tough part is all houses will have a moisture vapor issue and as soon as you trap that vapor it accumulates and becomes water and you are into the mold region.

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Old 12-12-2016, 09:06 PM   #6
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Re: Basement sub floor


The house was built in 98 I am the one and only owner. Landscaping is fine as long as sump works everything is fine on that side. Walls will be finished with the floor at the same time. Doing a room. Small room 20 by 15.6 room in a 1300 square foot basement. So this is just a small piece


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Old 12-17-2016, 12:07 AM   #7
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Re: Basement sub floor


------Welcome to the forum!---------------------

Appears I may have missed some questions.... :-), but I'll just answer this one; "What kind of subfloor would you all suggest?"; your choice of foam board/plywood OR the box store plastic/OSB tiles.

Links to each; Photo #3; https://buildingscience.com/sites/de..._basements.pdf

Fig.2 without the foam, but it has to be air-tight; https://buildingscience.com/document...ms?full_view=1

Another on that requires the added plywood; Delta FL ; http://www.cosella-dorken.com/bvf-ca...roducts/fl.php

There has to be some floor guys/gals that haven't answered yet, and have actually installed some floor systems, wait awhile... IMHO- go with the foam board as it also insulates as well as regulates moisture from below.

Gary
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