Need filler suggestion for OSB Sub floor.

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  #1  
Old 12-27-07, 09:15 PM
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Need filler suggestion for OSB Sub floor.

We just installed 3/4" tongue and grooved OSB over concrete in prep to install bamboo flooring. We still have a slight problem.

Because the T&G was not on all sides, we have slight height differences here and there and we want to level them. Don't ask me why it's so because the OSB is staggered.

So we now need a suggestion on a filler. Can anyone recommend one? We were thinking using plain wood filler, but we're worried it might cause the bamboo to buckle.

Thanks in Advance.
 
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  #2  
Old 12-27-07, 09:28 PM
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OSB has pretty uniform thickness - are you sure the problem isn't beneath the OSB?
 
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Old 12-28-07, 06:02 PM
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Originally Posted by mitch17 View Post
OSB has pretty uniform thickness - are you sure the problem isn't beneath the OSB?

It could be because the concrete beneath it is over 30 years old and isn't perfectly level. All I know is that we did clean, then seal the concrete before we put the OSB down.

BTW, Any suggestions on what to use as a filler?

Thanks.
 
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Old 12-28-07, 07:04 PM
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The OSB is directly on top of concrete?
 
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Old 12-29-07, 03:47 AM
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Uh-oh, I did read it right, then.
 
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Old 12-29-07, 09:16 AM
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Originally Posted by mitch17 View Post
The OSB is directly on top of concrete?
Other then the barrier coat (Concrete sealer) we put down, it's directly on top.

What's the Uh-oh for?
 
  #7  
Old 12-29-07, 11:58 AM
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How dry is your concrete? If you are in a very dry area you probably won't have a problem but if your slab is passing any moisture the OSB may swell or even rot.

A quick way to check is to tape a piece of sheet plastic over the concrete and leave it for a couple of days. If moisture appears under the plastic, you may want to reconsider and put down some sort of barrier between the OSB and the slab.
 
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