screws and ringshank in diaphragm uplift or floor diaphragm conditions

[JLSE]

Continue thread507-240452
I'd like to stick with the code as much as possible (ie- no ESR reports), but I am not sure what 'approved fasteners' means (SDPWS 4.2.6.3).

Where do you go to find other 'approved fasteners', in the code?

I was always taught, in southern Ca., not to use the withdrawl values for nails, at all. I currently find myself, designin an Open Building, using horizontal 2x6 T&G plank roof decking for a diaphragm. The code specifies the use of 16ds at each support, and end.

However, there is a substantial uplift due to wind. So, I am looking for a solution whereby I can utilize the ductility of a nail, and the uplift resistance of a screw (or sim).

One option is to use screws in lieu of nails, but I haven't found a ductile screw... and don't expect to.
One option is to use a combination of nails and screws, if they are compatible... and I have not found any orgainization or documents recommending this combo.
One option is to go with the uplift values of the ringshank nail... but I am not familiar with this nail at all...

Anyone found a good/better solution for this type of combined condition?

And, has anyone had good experiences specifying ringshank nails for floor diaphragms, in regards to eliminating the 'squeek'?

Thanks

 

[EngineeringEric]

As for the 'never' rule. never a good rule

All roof diaphragms are exposed to uplift, maybe not from both sides but from one at least. Nearly all timber sheathed on timber trusses are fastened with nails only. sometimes they fail, but usually it is because they didn't put in enough nails. I believe you can use the AWC Connection Calculator or code books and get the withdraw value for a 16d nail, if ringshank then it will only be more or equal. To help with your peace of mind at the roof maybe consider installing it with subfloor glue or an exterior rated glue. Glue will also help with squeeks and will have tensile value.

I don't think the ringshank will help the squeek honestly; glue & screws here will help

 

[JLSE]

Well, I don't want to use the withdrawl value for nails in an open building. Any other thoughts are welcome.

 

[BridgeSmith]

Have you looked into the 'spiral nails' (not sure of the correct name)? I've only seen them used in the construction of pallets, and they must be driven with a nail gun, but it could be something to look into.

I've also seen cement (plastic) coated nails used commonly for subfloors. They definitely have more withdrawal capacity than uncoated nails.