Can somebody assist me with installing the proper size header. I am about to cut my foundation. I want to install a 48 x 48 inch egress window in my basement. Its a load bearing wall and I want to make sure I use the proper header above this window. I have a 2 story home with a poured foundation, 8" thick. The window rough open will be approximately 55 inches across. What size and type header is required? I was think it should be similar to the floor joist above, which happens to be 12" LVLs. Any thoughts?