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Old 08-27-2011, 03:20 PM   #1
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Attic flooring question


Hi Guys,

I am going to install some R-13 in my attic and then some OSB for the floor. The studs are 24" on center, so will 7/16 thick OSB be sturdy enough or should I install something thicker?

Thanks in advance,
Chris in Las Vegas

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Old 08-27-2011, 04:34 PM   #2
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Attic flooring question


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Originally Posted by tinytr View Post
Hi Guys,

I am going to install some R-13 in my attic and then some OSB for the floor. The studs are 24" on center, so will 7/16 thick OSB be sturdy enough or should I install something thicker?

Thanks in advance,
Chris in Las Vegas
R-13 sounds a little thin...

You won't like the spongy feel of 7/16" osb at 24" span. I'd go with 5/8"min.

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Old 08-27-2011, 04:39 PM   #3
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Attic flooring question


Thanks for the tip.... I was wondering about the "bounce" of the floor due to the 24" between studs.

Going with R-13 just under where the floor is going becuase the opening below the studs is 3.5". I should have mentioned this is a garage attic with 0 insulation presently. Once I have enough floor space for storage, the rest of the attic will be R-30.
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Old 08-27-2011, 05:25 PM   #4
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Attic flooring question


What is the framing (ceiling joists) ? Why a floor?

Very few attics are strong enough to even use for light storage---24" centers?
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Old 08-27-2011, 07:16 PM   #5
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Attic flooring question


Those are not studs they are the bottom cord of the truss. You need to watch how much you put on the bottom cord it is not designed for much of a load. I have seen them sag and break you should have a stamp on the bottom cord that gives manufacturer and rating.
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