Hi folks. i'm in the process of building a lean-to shed on the side of my outbuilding, I'm picking it up as i go along & currently all's well but, I'm concerned about how I'm going to tackle the roof, my knowledge of joinery is basic to say the least so i was hoping someone could give a bit of advice on how to find the pitch and cut rafters to fit. Shed dimensions are 6 x 5ft, any help would be appreciated. 
