I have pre made truss ceiling joist in the garage. The joists are 2x4x21'.
I want to use space above the joists for storage. I want to sister a 2x6x21' or 2x8x21' next to 2x4x21' is this ok?
If it is ok how do I do this: nails, bolts? Any other recommendations? Or should I put the new lumber in between existing joists?