I'm putting 3/4 plywood over concrete. What would be the recommended amoumt of fasteners per sheet. Or recommended spacing for fasteners. I'm nailing with a Hilti type nailer. Would you also recommend 1 1/2 nails? Thanks for the help. Ken

Check this article out on Kens other site. Especially the part about floating sub-floors over concrete.

http://www.hardwoodinstaller.com/hardwo ... ncrete.htm

Would you then recommend the floating subfloor over direct nailing? Is it solid enough and does it sound too hollow? Teak is what will be installed. Most all my installs are glue down, so all recommendations are greatly appreciated.