Nail plywood sheathing from backside?
Nail plywood sheathing from backside?
(OP)
Would nails have any shear value if installed through framing outward into the plywood sheathing with the head on the framing side, not the plywood side, and the nails not protruding from the sheathing so they can't be cinched over?






RE: Nail plywood sheathing from backside?
RE: Nail plywood sheathing from backside?
My only guess would be that you are trying to install a new collector to an existing floor/roof without removing the finish.
If this is the case, Simpson Strong-Tie has done testing with their A35 clips using very short screws.
See link below.
http://www.strongtie.com/ftp/letters/generic/L-A35...
RE: Nail plywood sheathing from backside?
My thought is that lack of restriction from nail heads or chinching on the plywood face could allow movement and preclude shear value.
RE: Nail plywood sheathing from backside?
You’ve got the right idea. It’s the holding power (pull through at the plywd.) of the nail head or a clinched nail, plus some min. amount of nail penetration into the structural member which counts, for the shear cap’y. And, you don’t have the first item. Nor do you have sufficient penetration into a thin piece of plywd. Take a look at the nail failure mechanisms in the NDS manuals, the nail will just bend over and pull out of the plywd.
RE: Nail plywood sheathing from backside?
How about sheathing the interior face?
RE: Nail plywood sheathing from backside?
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: Nail plywood sheathing from backside?
I wouldn't trust nails from the interior side into the sheathing .02
RE: Nail plywood sheathing from backside?