How do I sweat pipes in an enclosed area?
I bought a piece of fireproof 'cloth' at the hardware store. I'm not sure what's in it - fibreglass? In any event, it's about 10x10 (or less) and you can just slip it behind the thing you are working on (I usually duct-tape it to the wall behind) and it protects the wall. I actually cut a slot in mine so that I could slip it around a pipe stub where the stub came out of the wall.