OSB for Subfloor?

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Molo

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What problems (if any) can be caused by using OSB for subfloor.
I'm asking because I don't need structural support, just a smoother surface to lay the luan on. You see... It's an old house with 1" thick boards for a subfloor (varying widths and slight thickness differences). :)

Thanks for any replies
 

Jadnashua

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For a subfloor, I like Advantec, but for what you're looking for, ply is better, I think as well.
 

Gary Swart

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The problem with regular plywood is there may be voids here and below the top ply. A sharp weight such as an appliance or woman's high heel can break through. What you should use as an underlayment is called multiply. It comes in 1/4"x4'x4' sheets and may have different names. It's like plywood, but it has no voids. As I recall, it isn't much different in price from plywood.
 
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