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Old 02-03-2016, 07:58 PM   #1
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sub floor Plywood vs OSB


I will be doing a job replacing a damaged subfloor. Question is, is there much benefit in using Fir Plywood versus OSB? Both are 3/4" t&g. Up here, the fir plywood is almost double the price of OSB. Is there a reason for this? Advice is appreciated.

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Old 02-03-2016, 10:45 PM   #2
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Overall plywood will make the floor stronger and will be more water resistant if that's an issue. If this is already an enclosed structure and you're just replacing the subfloor water may not be an issue. If it's a 2 layer for the lower layer should be plywood, the upper layer it doesn't matter quite so much. If it's a one layer floor it definitely needs to be plywood.

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Old 02-04-2016, 08:50 AM   #3
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Just not true.
Advantech subflooring is stronger, more stable, far more moisture resistant, 50 year warranty.
http://www.huberwood.com/advantech/performance/strength
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Old 02-04-2016, 10:30 AM   #4
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http://www.buildgp.com/dryply-plywood

http://www.buildgp.com/plytanium-plywood-sheathing
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Old 02-04-2016, 10:40 AM   #5
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what does your building dept have for code, certain ares will not allow osb...find out before you put the wrong stuff down..
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Old 02-04-2016, 09:51 PM   #6
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Quote:
Originally Posted by joecaption View Post
Just not true.
Advantech subflooring is stronger, more stable, far more moisture resistant, 50 year warranty.
http://www.huberwood.com/advantech/performance/strength
I certainly agree that if you use Advantech you will have great results but the OP ask about OSB which is something boldly different.
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Old 02-04-2016, 11:23 PM   #7
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Avoid OSB, whatever the code says. It's not flat enough for a good floor surface, and it will swell if it gets wet. It's fine for a lot of applications, but subflooring isn't one of them.

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