Sub Floor Framing Question
Laying down 80 mil butyl and foil thermo-acoustic sound dampener over the sheet metal on the floor. I was originally thinking of laying down the sub-floor framing directly on top of the finished sheet metal with adhesive and screws and then place the sound mat in between the framing
I've had a thought now, though, that it might be better to lay the sound mat down over the entirety of the floor and then build the sub-floor on top of it.
Would there be any significant gain in sound/heat dampening from this extra step?
Would there be any problems with the structure of the sub-floor built on top of the sound mat versus directly onto the floor?
I'll be using spray foam insulation throughout the bus if that information is relevant.