My roof truss timbers are 38mm x 72mm on 600mm centres with a 6m span. What's that in good old inches?
It seems a little skimpy to me; is this normal for a modern house? I am trying to do a rough dead load calculation. All the information I can find is for 4"x2" lumber. Mine are more like 1 3/4" x 3".
I think I read that 4"x2"s are actually smaller due to shrinkage so I have even less clue as to what my size is!