Hi all,
I’m a homeowner, not a pro so my questions might seem a bit naive.
I’m building a 12 x 12 Gazebo on my patio. It has a hip roof. For the first time in my life I’ve actually used a framing square for its intended purpose. There’s a lot more to framing than I ever knew!
Anyway, there are the four hip rafters, four commons and 8 jack rafters. I didn’t do the rafters 16″ oc or 24″ oc or anything like that as it is such a small structure. The jacks just split the difference between the common and hip rafters.
On sheathing: I have read that code for plywood sheathing should go longside perpendiular to the rafters. I have OSB which has no grain and so I was wondering if I could orient it the other way. Seems like that would save me a few sheets of material.
Next: where two sheets meet at a hip rafter, do you miter the edge of the sheets for a closer fit I(still allowing 1/8″ gap for expansion) or do you butt the lower corners of the edges together or even overlap one sheet over the edge of the other sheet?
Also, where the two sheets meet at a hip there will be an air gap under the sheet edges (since the top edge of the hip isn’t mitred) unlike at the common and jack rafters. Do you nail onto each corner of the rafter rather than the top edge of the rafter? Seems like you would but????
thanks,
ken.
Replies
OSB still goes perpendicular to the rafters.
check the manufacturer of the plywood. They may say it makes no difference if the ply is perpindicular or parrallel to rafters.
I think..
Seems to me osb is stiffer in the long axis similar to plywood. A 1' strip cut across the 4' width is limper than a 1' strip cut across the 8' direction. I think the chips are aligned with some type of voodoo commands to that purpose. Hence the name oriented strand board.
I would not agonize over how the sheathing meets on the hips other than getting enough of it on there to nail securely. You can bevel it but as long as the bottom edges are on the framing properly the joint at the top is no biggie.
I know that voodoo you're talkin 'bout
OSB manufacturers can only make this material when there is a full moon. Apparently that's when there's an electromagnetic field strong enough to align all the wood chips to their long axis. It's like watchin a bunch of [George Carlin WORD] roaches line up at night as they get ready to migrate from one apartment building to the next. I imagine it's all these manufacturers can do to get as many of these suckers pinned down and glued up before the sun rises.
ORIENTIED Strand Board.
It's called oriented strand board because the strands align along the long axis.
I thought it was called Orient strand board because it was made in China.
I once had a guy ask me "Why
I once had a guy ask me "Why do they call it Oriental strand board?"