Sound dampening

[scenic760]

In pulling out all my boxes of stuff to put this Suburban back together, I found my boxes of Kilmat...

I have (2) 36 sq ft boxes and vaguely remember my plan to be do the floors with the Kilmat and with the ceiling, doing foil backed foam in between the headliner almost like a wall assembly. Also I was planning to Kilmat the doors, under the door panels.

I have read several of the threads on sound deadening and had a couple of questions now:

1. If I don't put Kilmat on the ceiling, will the insulation and headliner muffle enough of he sound or is it just going to resonate through the interior?
2. I see a lot of people putting the Kilmat on the inside of the door's exterior skin. I see why this would be superior to door under the plastic panels but seems like a REAL PITA. Does it make THAT much difference?

Thanks all!

 

[TotalyHucked]

Can't answer about the ceiling as I have never applied it up there. But as far as the doors, it makes a HUGE different putting it on the backside of the outer skin. I've done this with both newer trucks and vintage ones. You don't need much either, I just put 1-2 squares of whatever size I can fit through the access holes in the door. It just takes the "tinny"-ness out of it.

 

[Bloodhound1981]

I definitely agree with the Kilmat on the outer door panel. You don't need to use a lot, there or anywhere else. I put one sheet inside each door and totally killed the tin sound. I did the roof as well before adding the headliner, and you don't have to go crazy over every square inch to get good results.