I am interested in how other people have dealt with the plumbing, heating, and electrical systems in timberframe homes. I am going to build a false subfloor over my second floor timber joists with 2x8 24" OC, with 3/4 T&G plywood over that. I will rip 1/2" OSB 4" then nail it to the joists for bearing surfaces, and place drywall between the timbers. The resulting space will provide wire and plumbing chases. If you have experience I would greatly appreciate a reply. I hate to reinvent the wheel, but I have had to do it in the past.