I'm sistering some knotched floor joists in my house. I'm using 3 1/2in 16D nails spacing them 6-8in apart on the board with 3 nails in each column so approximately 21 nails per 4ft board. The nails do stick out the other side of the floor joist and I read elsewhere that this is fine. Does it not matter that the original floor joist kinda loses a bit of wood as the nail punches through the other side?
Sistering floor joists
Wag51486
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You don't need to but you can pound the ends that stick out down. It will just keep the nails from possibly working them selves out down the road. The nails should be good your concern should be if the knotch is more than 25% of the joist height.
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