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Old 03-24-2010, 12:24 PM   #1
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OSB flooring for attic storage?

My attic space is currently filled with 6" of blown-in cellulose, and framed with 2x8 joists on 16" centers. I would like to add flooring to a portion of this space for storage after blowing in additional insulation.

Would it be acceptable/advisable to run 2x4s at 90 angles to the existing joists allowing me 12" of insulation, then to use 7/16" OSB over those to provide a solid area for storage? Would some kind of vapor barrier (or paint on the OSB) also be needed?

The installation is in Atlanta, GA and the 1500SF attic will be well ventilated with 48' of rigid ridge vent (and soffit vents to exceed the ridge vent balance requirements)

Thanks for your advice!
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Old 03-25-2010, 06:00 AM   #2
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Adding insulation is definitely a good thing, as is raising the storage floor to accomodate that insulation. Assuming this is for light storage, sounds like a plan.

Add unfaced batts to bring level up to the top of the joists, then run a layer perpendicular to joists. This helps seal up all holes, gaps.
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