Roof sheathing

astidham · August 02, 2010, 12:14:48 PM

my trusses are on 24" centers 12/12 pitch, what are my options for sheathing thickness?

MountainDon · August 02, 2010, 12:34:21 PM

7/16 and thicker, osb or plywood as long as it is rated for the 24" span (panels are stamped)

August 02, 2010, 12:54:23 PM

I used 7/16 osb with clips between the rafters. Be sure to stagger the sheets.

astidham · August 02, 2010, 02:08:42 PM

Thank You ScottA and MountainDon!
MountainDon, long time no see.

MountainDon · August 02, 2010, 02:13:33 PM

Quote from: astidham on August 02, 2010, 02:08:42 PM

MountainDon, long time no see.

good to be back here, even tho' we had a great time traveling.

August 02, 2010, 05:15:52 PM

I found 5/8" nice and firm for 24" on center. We did 1/2" plywood 24" on center with "H" clips on our garage. I felt like I was going to fall through . . .

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Mrdecatur217 · August 02, 2010, 08:37:44 PM

todd your indian see if you can't dance up a cloud with out makeing it rain,.,.looking good

ScottA · August 03, 2010, 08:06:19 AM

Quote from: bayview on August 02, 2010, 05:15:52 PM

I found 5/8" nice and firm for 24" on center. We did 1/2" plywood 24" on center with "H" clips on our garage. I felt like I was going to fall through . . .

/

I agree that 7/16 osb is bouncy on a lower pitched roof but on a 12/12 roof its plenty firm. My guess is by tilting it up at a 45 degree angle the stiffness in relation to up and down is increased. I've worked on both and you can feel a real difference.