OSB Ceiling installation

[ESwartz]

I'm going to be installing 7/16" OSB in my shop for my ceiling. My trusses are on 4' centers.

1. Do I need to install what I call sleepers between the trusses every 2' or will the OSB not sag on 4' centers? I will be adding blown in insulation later, that is the only weight that will be on the OSB.

2. Do I need a vapor barrier before I install the OSB?

Thanks

 

[Falcon67]

It'll sag on 48" OC, I'd about guarantee. 24" OC is the max rating for 7/16". It's stamped right on the material.

Can't answer the other - vapor barriers are climate dependent. We don't use them down here in a shop/garage.

 

[Stinger]

I agree, I've been in a pole barn that had OSB sagging for this very reason.

 

[willymakeit]

Yes and the sleepers need to be able to take the span and added weight. As mentioned previously the vapor barrier could be area dependent. Ask your insulation installer.

 

[cyamaha2007]

on barns weve done i install the sleepers vertically between the trusses. Its much stronger but takes longer. We used 2x4s

 

[ddawg16]

Why OSB instead of drywall? Price is about the same....but drywall will not burn....and reflects light better.

Either way, you will need the support (sleepers)