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Old 08-09-2014, 11:51 PM   #1
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T&G Subfloor Expansion Gaps?


Hey gang-

I am in the midst of a whole-house remodel (100+ years old) and am currently working in the kitchen/informal dining area.

Upon removing the original T&G hardwood finish flooring, I found that the subfloor consists of 3/4" thick, 6" wide non-T&G pine planks. This subfloor is in really bad shape and I would like to remove all and install a 3/4" T&G plywood subfloor, glued and screwed.

The following may seem like a strange question, but what is the typical practice of leaving expansion gaps between sheets of T&G plywood? I've done a fair amount of investigation and some installers butt all interior joints snug whereas others recommend leaving a small gap (thickness of a quarter or nickel) at each joint. It seems that an expansion gap is always recommended between seams of non-T&G plywood.

I live just outside of Chicago, Illinois.

Any advice would be appreciated as I am growing confused over all of the differing installation strategies that I'm finding.

Thanks!
Jimmy

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Old 08-10-2014, 01:39 AM   #2
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T&G Subfloor Expansion Gaps?


Quote:
Originally Posted by BigJimmy View Post
Hey gang-

I am in the midst of a whole-house remodel (100+ years old) and am currently working in the kitchen/informal dining area.

Upon removing the original T&G hardwood finish flooring, I found that the subfloor consists of 3/4" thick, 6" wide non-T&G pine planks. This subfloor is in really bad shape and I would like to remove all and install a 3/4" T&G plywood subfloor, glued and screwed.

The following may seem like a strange question, but what is the typical practice of leaving expansion gaps between sheets of T&G plywood? I've done a fair amount of investigation and some installers butt all interior joints snug whereas others recommend leaving a small gap (thickness of a quarter or nickel) at each joint. It seems that an expansion gap is always recommended between seams of non-T&G plywood.

I live just outside of Chicago, Illinois.

Any advice would be appreciated as I am growing confused over all of the differing installation strategies that I'm finding.

Thanks!
Jimmy
I think most of todays T&G subflooring is self-spacing.

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Old 08-10-2014, 09:25 AM   #3
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T&G Subfloor Expansion Gaps?


The tongues are longer then the groove is deep to make it self gapping.
Do you a favor and use real Advantech subflooring. Stronger, no voids, far more moisture resistant.
Unless you have a stand up screw gun I'd stick with 8D ring shanked nails and use a framing nail gun.
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Old 08-10-2014, 05:29 PM   #4
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T&G Subfloor Expansion Gaps?


Tack in a couple of 8 or 10 penny nails on the butt ends, advantech is self-gapping on the long seam. GLUE and screw. Just did the deck of a two story garage, very easy stuff to use (tap into place with a five lb. sledge and a block). We ended up just using screws every siix inches on the whole thing. Had plenty time and a battery powered makita drill/driver, no worries. Ron
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