Nailing Plywood Diaphragms
Nailing Plywood Diaphragms
(OP)
I don't do wood structures that often, so my typical details are kind of rusty. I used to require hand driven nails (as opposed to nails from nail guns), because there was an structural advantage to using them. Does that still apply? I can't find any section in the code that indicates this.






RE: Nailing Plywood Diaphragms
No one I know does much hand-nailing of anything these days.
RE: Nailing Plywood Diaphragms
RE: Nailing Plywood Diaphragms
RE: Nailing Plywood Diaphragms
With the hand driven nails, you will not overdrive them.
However, if the nail guin is not set properly, overdriving can happen with nail guns, lowering the shear value of the panel.
You just have to inspect the nailing and set the gun to the proper power.
Mike McCann
MMC Engineering
RE: Nailing Plywood Diaphragms
Mike McCann
MMC Engineering
RE: Nailing Plywood Diaphragms
Here is one ESR report:
http://ww
Again, technically the diaphragm tables are based on nails that that conform to ASTM F1667, which has more than just diameter sizes. The capacity and ductility of diaphragms and shearwallls will also be based upon the length of the nail and its head.
So, it isn't just a matter of checking similar diameter size and penetration. It is either use their ESR or make sure the nails conform to ASTM F1667 and the sizes specified in the code/standard. That is where we stand currently at least. I don't like it and wish the pneumatic nail industry would standardize their nails.
RE: Nailing Plywood Diaphragms
RE: Nailing Plywood Diaphragms
As usual, I'm impressed with how little I know. But I assume that if I define the plywood thickness (i.e. 19/32"), nail size (i.e. 10D), and the boundary, edge and field spacing, I have a pretty good chance of getting the right nails.
Another question; For the shear loads I calculate, It says that I need 3 inch nominal attachment pieces. I have no problems at the boundary walls and it even seems reasonable. But it's not clear, at least to me, whether I need to require 3 x wood trusses. It seems that the wood trusses I've seen have been made of 2 x 4's. If I need it, I need it, but I hate to require something that's weird and unusual.
RE: Nailing Plywood Diaphragms
If you need that much capacity - you might be screwed. But the 3'' is only required at the boundaries - that might help..
RE: Nailing Plywood Diaphragms
RE: Nailing Plywood Diaphragms