Im currently building a basement for my family to live in We plan on putting in the sub floor and laying trusses on top of the sub floor.we will put a metal roof on the trusses. This way when we go to build the rest of the top of the house we can take the trusses off then start building. We have yet to fully decide on a house plan. We do have a tenitave one but it is subject to change.
our basement is 30 x 40
here is the problem..... what size main beam should I use on the sub floor what size cross beams should I use How do i determine the load on these beams ect....... any information would be appreciated..