I have a friend who wants me to turn his attic into usable space by cutting and lifting the existing roof. He then wants to build walls underneath the roof and set it back down. I know this has been done before, but I am not sure how to do this safely. I also want to know if anyone thinks that we are saving any time or money by using this process instead of tearing out the roof and building from scratch.
I'm with you on this hairball approach. A roof section is going to be insurmountably heavy to remove whole, then re-use after the support walls are built. The existing roof structure would be compromised, would limit the architectural options (overhangs). The replacement roof has a different roof slope and size. No way. I wouldn't even consider it. If your buddy wants to strip the roof and save scraps of lumber and plywood for re-use, so be it. Personally I don't even like working with used materials due to damage to saw blades, inconsistent size, etc.