Jack Sobon mentions in his first book that the joint works well down to an 8/12 roof. I used it on a couple of 6/12 roofs, and you have to invade the inside arris of the plate. I don't think it is any different to cut at the lower pitches. For the record, one 6/12 roof was a shed off of a 12'x16' Dutch house. That looked good. They other is an 8'x8' shed. I think the roof looks too flat.