I want to clarify, the entire attic is about 20X20, but the largest
span is 15 1/2' in my master bedroom then it rests on a wall that
creates the bathroom. all the other spans are 12' until hit rests on a
wall below, like the closet, bedroom wall, etc
I also heard it was good to screw down all the OSB to actually
strengthen the floor. So far it seems solid. I am not looking on
putting anything massive up there, just basic stuff.