McMaster-Carr has a well known mat that is like the original Dynamat but
far cheaper. The panels do need to be dampened with a heavy material to
keep from vibrating. An absorber of some sort must also be used.
Price is a point with me as I'm not employed. I do have some income
coming in, but only enough to pay utilities bills and the like so price
point is imperative. Wnats don't outway needs.
What I found that is working pretty well is duct insulation from the box
stores. It's a self-adhesive foam with foil covering. It has some weight
so dampens and since it's visceilastic foam it's an absorbant as well. I
drove around today with the interior still out (drivers seat only as I
took the headliner in to get recovered. Roof, rear cab and rear side
walls are treated with 2 rolls of this tuff. I also shoved a one foot
peice of standard home insulation in the cavites on each side. It's
quiet! Still a lot of noise coming on from the door panels and floor by
I want to get some more stuff up under the light weight foam the factory
uses under the dash.
When the carpet goes back in along with the seats and headliner, it
should be that much quieter. It's amazing how loud the truck is with the
interior out. They use it as sound deadening vice just a seat to sit on.
There is nothing behind the rear seat.
There is a factory applied something hard to the floor in spots as well
as the side panels. (4 inch squares or odd shaped sizes here and there
in no particular order)
I called a local industrial supply place looking for closed cell rubber
or neoprene and when asked what I wanted it for, the man said go get the
DIY bedliner. He used it on his jeep and was quite happy with the
I read a post on a car forum site where a man had mixed concrete patch
with the liquid roof repair stuff with great results. Just something I
I talked to a local shop. Their experience has been regular dynomat
doesn't do much, but the extreme (which is visceolastic foam) works
well. Since the factory already has dampening taken care of, I'm looking
for absorbtion material; heavy dense closed cell foam of the type
normally used in audio apps. The duct insulation seems to be the ticket
for my price range ($14 for a 1 x 15 ft roll; doesn't go far). There is
an ebayer selling 1/4 closed cell neoprene in Ca for pretty cheap. It's
$25 for a full sheet 42 x 72 inches. I could place that on the floor
but it might take up too much room and the carpeting not fit back into
place. I may add the duct insulation in spots as well as stop by a
carpet shop for a pad. I'm going to get the foam up under the factor's
foam as far as I can. I'm not removing the dash toget behind it, that's
for sure. LOL