My attic floor is covered with insulation and the first time i went up there and standed in the attic the floor went down and when i came down from the attic i saw nails on my roof that had popped out and i was wondering if this is even safe to be up there?? and my attic is very hot in the 140s and i need to know what i can do to bring the temp down thanks armen.

Severe water damage necessitates replacing basement bathroom. When I pulled up the old flooring I found totally decayed plywood and floor joists. Beneath that, mud & clay. How do I go about repairing such extensive damage? Half of the basement has a concrete slab and the other half has a plywood floor. I assume that beneath that flooring there is nothing but dirt. Can this be repaired using only lumber? If so, how do I tie it in with the existing flooring without any visible solid wood available? How important is it to get the decayed wood removed? Will it just keep rotting or will it stop once it dries out? Should I have concrete poured instead?