OSB or plywood?

Old 04-06-09, 10:31 AM
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OSB or plywood?

I will be reroofing the detached garage roof in the next month or so. I have to replace about 8 sheets of 1/2" plywood. It looks like OSB board is half the cost of plywood ( $8 vs. $16). It has plywood up there now but would like to know if this is standard for new builds today or do they use the cheaper OSB. Not sure what the drawbacks are to each other than cost. Please let me know. Thanks
Old 04-06-09, 03:41 PM
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OSB will be fine. Some people do not like it but in my experience it holds up better than plywood if it gets wet, and as you say it is cheaper. When OSB first came out it swelled up when it got wet but the new stuff with better glues has been fine. If your rafters are on 24" centers you should use "H" clips in the center of the span.

Old 04-06-09, 04:12 PM
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Bill's right, everybody's using it because of cost.

1. Put the rough side up to walk on.

2. Always run 8' length perpendicular to framing.

3. Maker recommends minimum 3 bearing rafters (no two footers)

4. Don't turn your 4' sheet and install the strength axis the wrong way. Watch the lines, or the label stamp on other side. Be safe, GBR

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