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We have seen undersize plywood sheathing, but only 1/16 by in. or less, never by as much as 1/8 in. We always insert H-clips on the long side of the roof sheathing to give us our spacing. Posted by Jason: We see minor sheet-buckling telegraphed through the roof shingles. We are beginning to see “Sized for spacing” products, but sometimes ...
Because this sheathing material does not provide a diaphragm at the plane of the roof, other means of bracing the roof against horizontal loads must usually be employed. For example, the roof may be braced with diagonal metal straps applied to the top of the sheathing or with a layer of plywood or OSB over the decking.
I'm watching my builder install Roof Sheathing over the Garage and second floor of my home. I noticed that the builder has left 1/8" - 1/4" inch spaces between panels on the roof with H Clips holding them between each other. I've included pictures below. I found an APA manufacturer's guide online that recommended spacing between sheathing, but any other illustration I've seen of Roof Sheathing ...
Most buildings need roof sheathing to support the roofing material and add rigidity to the rafters or trusses. Working with plywood or OSB sheathing is a pretty straightforward process, but smart techniques can make the job easier, faster, and safer. We’ve collected our best articles and videos on the topic to help you out.
The only time I use clips is when I framed with roof trusses @ 24" centers. I framed an addition for the first time with 2x10 rafters @ 24" centers and I used clips. Other then that, clips are never used.When I first started framing back in 1983, all we used for roof sheathing was 1/2" and all our sub-floors were 1/2".
Another plus is that as long as the total roof load doesn’t exceed 80 psf and as long as the trusses or rafters aren’t spaced more than 24 in. on center, the true 1⁄2-in.-thick Zip System roof panels don’t require the use of H-clips to stiffen the sheathing.
I'd guess that a vast majority of homes being built today get 7/16 osb for roof sheathing. 7/16ths is often used interchangeably with 1/2". The H-clips are used on square edge sheathing that is installed on 24" OC trusses or rafters. Roof sheathing and wall sheathing is often interchangeable.
The clips and the edges are self-spacing, but you do have to pay attention to the left-to-right spacing on the sheathing. Usually I just put an eight-penny nail in on the top and that gets me the 1/8-in. required spacing between the sheets before I start to nail them down.
A portion of the 100-year-old farmhouse roof framing and its board sheathing were left intact, so we checked the straightness of panels with a string and shimmed underneath the clips as needed. In the future, I would be more insistent on installing a 1 ⁄ 2-in. layer of plywood or OSB over old board sheathing.
*Hey Travis - We just built a new house in Northern Ontario, and the architect spec'd no roof sheathing to same materials. The trusses are strapped with 2x4's 2'oc, and a metal roof bolted to the strapping. Sorta off topic, but sure saves lugging a lot of material. DIY Jim