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-   -   plywood/ osb scraps for sheathing? (http://www.diychatroom.com/f9/plywood-osb-scraps-sheathing-80733/)

nicole21 09-07-2010 10:04 AM

plywood/ osb scraps for sheathing?
 
hello

i bought a condemned house and just framed out a bastard hip roof over a small (20x8) section of my house. i am now ready to add sheathing. i am trying to rebuild this house out of as many salvaged materials and other peoples "garbage" as possible. i've collected many osb and plywood scraps from construction site dumpsters, some almost whole sheets, some about a quarter of a whole sheet. i'm aware that this will take longer than putting full boards up, but i'm ok with that. i'm also aware that osb edges fray once cut and that plywood scraps probably hold up better on the edges. so i have a few questions:

1. is the strength in board materials like osb and plywood in it's span, or can i put the scraps up there and still be ok? (and will that pass inspection?)

2. i am planning on using a metal roof, corrugated or standing seam, with a breathable synthetic underlayment. if i want a breathable system so water doesn't get trapped, is there a better sheathing option than others?

3. when i put the sheathing on, should there be a slight gap between the edges to allow for expansion and contraction?

thanks!! -nicole

Scuba_Dave 09-07-2010 12:28 PM

Where are you located ?

How big are these scraps ?

Tizzer 09-07-2010 03:27 PM

Quote:

Originally Posted by Scuba_Dave (Post 497207)
Where are you located ?

How big are these scraps ?

<
i've collected many osb and plywood scraps from construction site dumpsters, some almost whole sheets, some about a quarter of a whole sheet. >

We always saved any pc. 2ft. and larger until the house was finished. It is easier when you have at least one factory edge. You can use those tiny pieces at the very top of your hip roof.
Gaps; we used an eight penny nail's width or if using plywood clips, the clip is the gap.
I'd just be concerned about if that scrap got wet and has swelled or it had been sitting so long it turned grey.

seeyou 09-07-2010 04:15 PM

Quote:

Originally Posted by nicole21 (Post 497143)
hello

i bought a condemned house and just framed out a bastard hip roof over a small (20x8) section of my house. i am now ready to add sheathing. i am trying to rebuild this house out of as many salvaged materials and other peoples "garbage" as possible. i've collected many osb and plywood scraps from construction site dumpsters, some almost whole sheets, some about a quarter of a whole sheet. i'm aware that this will take longer than putting full boards up, but i'm ok with that. i'm also aware that osb edges fray once cut and that plywood scraps probably hold up better on the edges. so i have a few questions:

1. is the strength in board materials like osb and plywood in it's span, or can i put the scraps up there and still be ok? (and will that pass inspection?)

2. i am planning on using a metal roof, corrugated or standing seam, with a breathable synthetic underlayment. if i want a breathable system so water doesn't get trapped, is there a better sheathing option than others?

3. when i put the sheathing on, should there be a slight gap between the edges to allow for expansion and contraction?

thanks!! -nicole

Plywood and OSB (oriented strand board) have to be laid so the original 8ft side is perpendicular to the rafters. Any piece should also bear on at least three rafters.

edit: as far as the inspection question, you'd better talk to the inspector before embarking.

amdspitfire 09-08-2010 11:41 AM

Quote:

Originally Posted by seeyou (Post 497345)
Plywood and OSB (oriented strand board) have to be laid so the original 8ft side is perpendicular to the rafters. Any piece should also bear on at least three rafters.

Do the 8ft sides also have to lay on the cross 1x4 pieces?


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