Any thoughts about a good construction technique to keep a stage from sounding like a drum head as it is walked on? We are probably going to want carpet as the walking surface to deal with a worship band.
In that case, see this thread: http://www.controlbooth.com/forums/scenery/14277-building-band-platform.html. The thread mentions using a Celotex-type product under the 3/4" plywood decking OR on top under the layer of finished floor, possibly hardboard or MDF. Fiberglass batt insulation or spray polyurethane foam could also be used. Museav makes very good points regarding building codes and fire ratings.
If you're having problems at your local supply store when you ask for Celotex, ask for Homasote. Availability is different from one part of the country to another.