The Stovebolt Site Forums The Shop Area Interiors Hushmat Covering

I used some 1/8 inch thick neoprene foam I had left from another project. It was self-adhesive. I then added a layer of self-adhesive radiant foil barrier on top of that (you need that thin metal layer to convert the sound waves into heat where they get dispersed back into the foam). That's really all the hushmat type products do, but they all use very thin foam it seems. Carpet and a jute mat beneath are okay but a rubber floor mat over jute is fine also and may be easier to keep clean. Be certain to do the area under the seat also. Your rear cab mounts can transmit a good amount of noise. And while you're at it, please check the front cab mounts. The rubber replacement pads you get for those aren't made from the right material and they compress pretty quickly. That (or the dead old pads) will let the pinchweld of your cab sit right smack on your frame and that will let a lot of noise be sent into your cab. I use common shower pan liner (a tough pcv material) cut into pieces and laminated to make new pads for the front mounts...it kills noise and it won't compress. Good luck.