I need to paint on my roof which is on a slant. Is there some sort of structure I could build with wood (2by4's) to attach to my roof? I CAN nail into my roof but just not into the shingles. I was thinking of building a structure about 8 feet wide that would make myself level with the ground. I'm just having problems with attaching it to my roof. Any idea? Any links to images of completed structures or scaffolding? Is there a simple solution to my problem? Thanks!!