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 Post subject: CDX vs. ACX Plywood for Subfloor over Concrete Slab
PostPosted: Thu Aug 04, 2011 6:14 pm 
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Joined: Mon Jan 25, 2010 6:19 pm
Posts: 21
We will be floating a 3/4" plywood subfloor over our slab. Based on advice received here, I had decided to go with CDX plywood. After looking at the warped, bowed stacks of plywood at HD and Lowes, I called around to a few lumber yards to ask about their 3/4" CDX. I specifically asked them about the flatness of their CDX stock and two different places told me that CDX will not lay flat to start with, even ripped into 18" sheets, and will not be as stable as a higher grade plywood once it's down. This sounds like a disaster in the making for my finished floor. They both recommended ACX for my purpose.
Is this at all consistent with what you've seen with CDX?

Thankfully, our house is small and we will only need about 30 sheets and the price difference is about $7-10/sheet. If I'm getting a better product for my application, I'm happy to pay the difference.

Thanks for your continuing help.


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 Post subject: Re: CDX vs. ACX Plywood for Subfloor over Concrete Slab
PostPosted: Fri Aug 05, 2011 11:51 am 
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Joined: Sat May 02, 2009 3:45 pm
Posts: 2874
Location: Tucson AZ
I could try and explain it to you but here is a forum thread, much easier for me instead of typing all that, read both pages.

http://www.nachi.org/forum/f18/cdx-subfloor-7836/

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Stephen Perrera
Top Floor Installation Co.
Tucson, Arizona
Floor Repairs and Installation in Tucson, Az
http://www.tucsonazflooring.com


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 Post subject: Re: CDX vs. ACX Plywood for Subfloor over Concrete Slab
PostPosted: Mon Aug 08, 2011 7:42 pm 
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Joined: Fri Aug 05, 2011 6:00 pm
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While I don't know everything about subfloors for installing hardwood I do have one recommendation. But this is also a question for the more experienced hardwood installers because I think its a good ideal and do not see how it could hurt anything. So my recommendation/suggestion is if it is appropriate to sand the seems on the underlayment if its 3/4 or thicker. I have also heard of using a nail as a spacer between the sheets of underlayment and this is a cleaner method but not usable on remodels.


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 Post subject: Re: CDX vs. ACX Plywood for Subfloor over Concrete Slab
PostPosted: Wed Aug 10, 2011 7:49 pm 
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Joined: Thu Sep 23, 2010 7:02 am
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Location: clarkston, michigan
i have used both not by choice but what has been bought for the project, personally never cdx usually because its a yellow pine which has alot of movement, i alway prefer a fir,(stable) but what ever you use it should be t&g. that way you will not have a seam problem when the slab is not level.


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 Post subject: Re: CDX vs. ACX Plywood for Subfloor over Concrete Slab
PostPosted: Thu Aug 11, 2011 10:41 am 
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Joined: Thu Jul 14, 2005 12:05 pm
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Location: Knoxville,Tn
if I had my choice it would be two layers of 7/16 or 3/8 ripped down in 8 x 2 panels laid perpendicular to each other staple together and nail to that of course it should be over felt plastic felt sandwich.

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Kevin Daniel
Heartland Hardwood Flooring
Knoxville, Tn
www.HeartlandHardwoodFlooring.com


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 Post subject: Re: CDX vs. ACX Plywood for Subfloor over Concrete Slab
PostPosted: Fri Aug 19, 2011 11:09 am 
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Joined: Mon Jan 25, 2010 6:19 pm
Posts: 21
Thanks for all of your replies.

I will try to find the flattest plywood I can that is not pine.


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