Katalyst777 I get that but here's what I'm trying to do - even with a 6/12 roof the bottom of the trusses don't land on thin inside wall. If you look at the truss design it should land on the inside wall and then extend 8 feet out over the porches on either side. However in my plan, as I have it nouw, the trusses land on the outside supports on the outside of the porches. make sense?