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MntGoat
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# Posted: 8 Mar 2017 07:17pm
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Hi everyone, I purchased a plot of land that has a 16x32 platform that is a couple years old. There are 12 large sonotubes and pressure treated 2x8 joists 16" on center. Very well built.
The concerns I have are as follows, the decking (subfloor of future cabin) is only 1/2" plywood. This has been nailed well and liquid nails applied to tops of joists before installation. Is this a problem? Seems very light duty. Thinking of a 3/4" finished floor on top if I can get away with 1/2" subfloor. If not, I am concerned that if I put advantech on top I would need to have the 1/2" plywood 100% dry which isn't going to happen in my neck of the woods until the roof is on.
Thanks!
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cspot
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# Posted: 8 Mar 2017 09:01pm
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If it was me, I would tempted to remove the 1/2" subfloor and put down the 3/4". The downside is if it was glued down then you probably can't remove it without damaging it.
How does the 1/2" plywood look? Is it treated or painted? Is it starting to delaminate?
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MntGoat
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# Posted: 8 Mar 2017 09:48pm
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Sure sounds like a lot of work! The plywood would be destroyed taking it up.
It's in good shape. 2 years old.
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bldginsp
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# Posted: 8 Mar 2017 10:35pm
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Most 1/2" plywood is rated to work as flooring on 16" centers- but that doesn't mean it's a good idea. If you put 3/4 flooring on it I bet you would have lots of creaks at least and maybe loose boards eventually. 1/2" is really minimal for nailing into- some roofers prefer 5/8" plywood on roofs just for the extra nailing strength.
I'd leave it as is, protect it from moisture damage, then cover it with 3/4 when it's dry enough. It's inconvenient now, but you'll be glad you did.
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benny8
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# Posted: 9 Mar 2017 05:21am
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I would add screws to the 1/2" plywood. Then put down your 3/4" finished flooring, with the longest lengths spanning the joists and try not to have your joints line up with the joints of the 1/2" plywood.
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MntGoat
Member
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# Posted: 9 Mar 2017 10:22am
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Thanks guys. My other thought was to frame the building and get a roof on it, then go back and add advantech before I put a finished floor down. The only disadvantage is that I would have walls framed up inside to work around, but it would be dry.
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cbright
Member
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# Posted: 27 Mar 2017 03:00pm
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I would get it dried in and then put a layer of 1/2" on top of the 1/2".
Glue it down and add lots of screws.... then add the finished floor. Would be a super solid floor.
I actually used 2 layers of 3/4" on a large mudroom (8'*10') that I built onto my house. Did that because I was tiling the floor and didn't want anything to move. Worked great and is super solid.
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