Correct nail size for panel nailing? (preferably quick response)

[LLLVäxjö]

Helping a relative nail standing siding.

First, 21x95 for the baseboards nailed with 60mm nails into the nailing battens which are sparse panel (28x70mm about cc60).

The second layer will be 21x120 which we tried nailing with 75mm nails but it seemed like they weren't holding well. Should we go up a nail size or can we continue? (I think we have a box of 3.4x100mm nails, not on-site yet). Behind the nailing battens, there is exterior gypsum on standing studs.

 

[Bo.Siltberg]

Three-inch is customary - it should fit. Have never nailed a lid with four-inch.

 

[Johan Gunverth]

Four-inch or rather 3.4mm thick. Try to find shorter "four-inch nails". In your case, 3.4 x 70mm. House manufacturers often have these and you can surely buy from one of them or from a reputable hardware store.

 

[Mikael_L]

The carpenters building the house across from ours, and they are real carpenters, are installing board and batten siding. The underlying board, which is relatively wide, 145-170, is nailed with a single 75mm nail in the middle of the board at each nailing strip (which is 28x70). The battens (22x45) are fastened with a 4" 100x3.4 nail at each nailing strip.

I believe they have cross-battened on the outside of the framing, which likely means that there is a stud behind the nailing strip as well, with an exterior gypsum board in between.

I'm not sure if this helped you since you have wide battens, not narrow ones, and probably need to nail with two nails on each nailing strip.

 

[Johan Gunverth]

The carpenters building the house opposite ours, and they are real carpenters, are installing board and batten siding.
The baseboard, which is relatively wide, 145-170, they nail with a single 75mm nail in the middle of the board at each nail batten (which is 28x70).
The batten (22x45) they secure with a 4" 100x3.4 nail at each nail batten.

I think they have cross-braced on the outside of the frame, which means that there is likely frame wood behind the nail batten as well, with an exterior gypsum board in between.

Don't know if this helped you, you have wide battens, not narrow, and will probably have to nail with two nails on each nail batten.

My real carpenter only placed a single three-inch nail somewhere at the top, at one edge of the baseboard. Then four-inch nails through the batten at each nail batten. The batten thus keeps the whole baseboard floating, and the single three-inch nail holds it up vertically.

 

[LLLVäxjö]

Thanks for the answers. We ended up buying 3.4x90 but we didn't use them for all the outer boards, we mixed it a bit. On the gable peak, it was only 2.8x75.

I think there was a crack in one of the nail battens that fooled us a bit regarding how the nails fastened in the wood.

Weekend's results, window mounted and panel nailed: