I went under my tenants crawl space in hopes I could insulate it for this winter. I found out my house is not on your typical 24" floor joists. It is on 4x7 inch beams with a little more than 44" of space between each beam. I think twine will sag to much to keep up the insulation. What is the best way? Any help is appreciated. :confused:

I just had a 12' x 24' building built to start a business in. I'm calling this my new GREEN office cause I'm trying to go as energy and environmentally friendly as possible. I'm getting an 11.4 EER rated A/C and I have radiant barrier on the ceiling. The building is sealed very well from what I can tell and how I saw them build it, but I have decided on spray-foam for the walls, possibly the ceiling over the radiant barrier too, and the subfloor. The subfloor is about 6 - 8 inches off the ground and the base frame is galvanized steel leaving about a 2 inch gap between it and the ground. The air space between the ground and floor is my concern (moisture). Having that a/c running in there all the time I'm sure will cause moisture on the bottom of the 5 ply - plywood interlocking lipped floor. [B]How do I raise or tilt the building so that I can spray-foam on the underside of the floor?[/B] Do ya'll think just putting weather sealing (Thompson brand) clear paint on it will be enough? or should I do the foam?