thank you for the response,to my last question.........but could someone explain to me the easiest way to use and figure out,my plumb and and level cuts using a framing square,i think they are called the birds mouth [level?cut]and plumb cut or pitch cut......tearing down old wood porch the two side walls and front walls are all rotted the roof is still in good shape..........roof is 2x6 rafters and 2x4 joists.....17'10" wide 9'2'deep and walls are 8'3"high