Hello, My house is a single story ranch style, with basement, and I am planning add an addition to the back. My rough ideas are an 8d x 12 w to be used as a laundry /mud room type of area. I am hoping this to be a temporary addition ( approximately 1 year) to get enough money saved for a much larger addition, so keeping costs minimal, doing as much as I can myself is my key goal. I have ability, just not so much the know-how of some of the finer things contractors know. Some questions I have in regard to this particular project are: How to layout/and cut to make these 2 roofs fit together properly? I have no idea about pitch, but it is not very steep. What do I need to do with the underside of the addition? It will be raised approximately 2 off the ground, frame/joists of 2x6 pt, with ¾ OSB Sub Flooring covered by some self stick vinyl tiles. With plans of a bigger, better, permanent addition, there will be a slab poured so I am also concerned about the poured concrete footings on this temporary structure. Here is a rough sketch, addition being yellow: I am sure more questions will arise, and I thank you for your assistance.