[QUOTE=lodstudios@gmail;4704709]
I was under the impression that I could simply use a vapar barrier, just before drywall, and not do the Tyvek...this is based on what I had read on this forum by Rod. Maybe I misunderstood, I was thinking that because this isn't new construction that I could use a vapor barrier and be done with it. NO?[quote] The Tyvek is the vapor barrier.
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The structure is not attached to the frame, neither is my house. It was build in '26 and it simply sits on the foundation....I am looking at bolting it down for sure.
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White Cap should have the really cool epoxy foundation bolts. Much easyer to install
than red heads
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Inside the studs is a hard deal. Because it is so old, it is not plumb in most places. I had a hell of a time so far cutting the 1/2" plywood to go between the studs, there were some pretty nasty gaps in some places so I am caulking the $*%& out of it. (after the backer rod) This is what you were suggesting with the OSB, right?
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Sounds like you are trying to add mass to the exterior wall (between the studs) with the plywood. Doing that might add some rigidity but could could pop out if the structure racks. Shear-walling is placing a sheet product (OSB) on the face and nailing it with 8d nails 2" from the edge and every 6" on the studs. This is done on every new home and stick frame building in CA.
Here is what it looks like on the exterior of the wall,
http://www.odellconstruction.com/fre.../17backshl.jpg