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I nail them 16d at 16" on center, two rows- one top, one bottom. (Same as a built up header, per code). There is no code on sistering but I want them to be as strong as a header. Also, I keep the nails away from the edges 2" so not to be in the tension or compression area of the boards.(Top 1'--1-1/4" of edges) No floor joist can be notched in the middle 1/3 of it's span, for that reason. It may not be necessary with just nails, but twice when bolting rim/ledger joists to glue-lam beams, the Structural Engineer required 2" clear area - top and bottom. And one other time, lag bolting a rim and floor joists to a new carrying truss, same requirement. Maybe nit-picking, but why risk splitting. My two cents. Be safe, G
 
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