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Bkc1010
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# Posted: 12 Sep 2016 08:18am
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New to forum and really have enjoyed reading for months. I just built a small cabin but instead of tounge and groove subfloor they put in 3/4" treated plywood. There are very small cracks which is no big deal I can fill those easily. It's built on 4x6 post 40" off the ground to floor. I plan on insulating floor underneath and then covering that with 1/4" plywood underneath. My question is am I ok with non tounge and groove on subfloor? I plan on putting hardwood floors down. Cabin is 12x16.
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creeky
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# Posted: 12 Sep 2016 10:54am
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Is it screwed down or nailed? I would screw it down to avoid squeaking later.
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Bkc1010
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# Posted: 12 Sep 2016 05:13pm
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Thanks and it is screwed down
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bldginsp
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# Posted: 3 Oct 2016 02:57pm
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You could have a problem with the hardwood flooring at the unsupported joints of the plywood. The joints that fall on joists are no problem, but the joints perpendicular to the joists have no connection. The purpose of the T+G is to lock the two floor sections where there is no support beneath, between the joists. Try stepping on one side of a joint between joists, see if it budges a bit compared to the adjacent plywood. That's what will happen under the hardwood floor when you step there, and could gradually cause it to loosen. The solution is to install blocking at the unsupported joints from below and nail the subfloor to the blocking.
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sparky30_06
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# Posted: 3 Oct 2016 03:22pm
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One thing I would watch with the pressure treat plywood will be shrinkage as it dries. I know it's plywood but it will shrink.
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