How do you s***w the 4x4 into the floor joists? Will this be strong enough for the railings?

Question

How do you s***w the 4x4 into the floor joists? Will this be strong enough for the railings?

Answer 1

Assuming your joists are exposed, sandwich the 4x4 between two pieces of lumber the same dimension as the joists and length to span between existing members. Obviously these parts should be assembled to establish the desired location of the post. s******g and glueing of these pieces should give added stability.

Answer 2

may i suggest   you s***w  a 2x6 to the 4x4  once you concrete them  in ......  or s***w two   2x6  on to each side,