Quote:
My question is, is there harm in sweating a connection just above the P-trap given all the potential methane gas that could be circulation in this room. I'd prefer not to catch myself on fire of blow a sewer cover!
Tell you whot! If you fill that trap with water you'll be perfectly safe. However, I'm concerned about the rag stuffed in the toilet. The rag's dry and no doubt is allowing some sewergas to escape. Not that I believe there's enough methane to light off but I would wet the rags and jam them in tightly to make the opening airtight.