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Hardwood subfloor thickness?

Posted by Karenseb (My Page) on
Fri, Jan 31, 14 at 20:26

We are having a white oak site finished floor installed in a previously carpeted upstairs room where we would like to put a pool table. We have discovered the sub floor has particleboard over a 5/8 inch plywood sub floor. The floor joists are 2by10 16 inch OC. We would like a solid floor and the installer suggested waiting till the particle board comes up before deciding if the plywood is good enough for the installation. I hate to increase the height of the floor by adding a half inch of plywood on top, but wonder if we should just go ahead and do it even if the sub floor seems okay. Or will the 5/8 inch sub floor be good enough?


Follow-Up Postings:

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RE: Hardwood subfloor thickness?

The weight and size of the table would be an extremely interesting piece of information to include.


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RE: Hardwood subfloor thickness?

Pool tables weigh up to 1,000 lbs. But also consider the four or five guys milling around the table. (The average American is overweight to begin with.) A thousand pounds of beef on the move will keep the floor flexing, thus affecting the balance of the table.

This post was edited by worthy on Sat, Feb 1, 14 at 0:44


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RE: Hardwood subfloor thickness?

The installer and my husband have decided to put down an extra 3/8 in of plywood on top of the 5/8. It is an over 8 1/2 foot sized pool table built 10 years ago. (on the heavier side pool table with 3 pieces of thick slate). Built like a tank.
Hopefully 3/8 in of extra plywood will do the trick.


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RE: Hardwood subfloor thickness?

If you want to preserve every fraction of an inch of headroom, use engineered 3/8" ceramic underlayment plywood. It has more layers of wood and glue than standard plywood and is stiffer. Otherwise, standard 3/8" will not do much. I once used it instead of 5/8" and eventually all the grout lines cracked.

FWIW, where I install tile or stone on 2"x10" @16" o.c. framing I have two layers of 5/8" or 3/4" plywood subfloor


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