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Old 05-22-2020, 03:57 PM   #1
Mini-Skoolie
 
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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.
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Old 05-22-2020, 04:49 PM   #2
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Quote:
Originally Posted by dog_and_ape View Post
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.
What's the PSI rating for the sound mat?
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Old 05-22-2020, 06:14 PM   #3
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I searched format and came across several brands. I don’t think I see what this will accomplish on the floor. It might knock down vibrational noise on a bare sheet metal floor, but I think that the addition of foam insulation, wood frame and plywood screwed to the floor kind of makes that stuff moot.
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Old 05-23-2020, 12:17 PM   #4
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Our tentative plan is to spray foam the entire interior, floor included.

Not only will it cost exactly the same as if we just did walls & ceiling (company we've chosen has a minimum square foot limit we're under even w/ the floor included), it should also provide significant sound deadening & it serves as its own vapor barrier.
If we weren't foaming the roof & walls, it might not be so cut & dried. But since we are, doing the floor at the same time seems to be a no-brainer. Nothing compares in the ability to kill so many birds (thermal/sound/vapor) with a single stone.
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