HOW TO FIX SUNROOM ADDITION SUBFLOOR
House built in 1979. Front porch area turned into sunroom decades later by previous owners. Now I want to convert sunroom to living space. Tore up the floor to just the bare structure -- the floor joists. No concrete foundation or slab is there. What should I do to keep out moisture, as well as the heat in the summer and the cold in the winter? What should I do to add stability? The existing outer walls are sitting on concrete blocks.