Sound and Heat Proofing
We road-trip in an air conditioned Miata – and the footbox on it gets warm. I am paranoid about footbox heat and I don’t think this puppy is going to play nice. To counter the heat, I have gone overboard. I am optimistic it will do the trick.
The exposed portion of the firewall is aluminum. Below it is a layer of Frost King Duct Insulation. (3/16″ dense adhesive foam with a few mil aluminum cover. Next is a layer of heat barrier film that came with the kit. Finally we get to the 3/16″ fiberglass foot tub. On the inside of the tub, I used a sheet of Second Skin Thermal Block. This is a 3/16″ mat covered with a textured aluminum. Claims it will block 1200 degrees. Further back on the transmission tunnel, I used Second Skin Heat Wave, a 3/8″ jute style insulation with an aluminum foil surface. Floors and rear wheel wells were covered in Frost King foam. All this was sealed with aluminum tape prior to mounting the carpet.
This photo shows the Thermal Block, installed inside the footbox. The pedal mounting plate goes over the top of this.
Rear wall covering
I really liked the finish of Jim Reiss’ rear wall on his rebuild of HM1006. He put aluminum sheet down and then covered with vinyl. Since I wasn’t as far along as he, I was able to finish the fiberglass surface of the cockpit tub with a little Bondo. It looks as smooth as the aluminum would have. To give it a little resilience, I then installed a 1/16″ thick vinyl drawer liner. Over that I glued the same vinly material as used on the dash and seats.
The carpeting is pretty straight forward. There are a few tricks – these are outlined on the carpet detail page. The choice of light tan carpet to compliment my leather seats sounded good. The light color is very unforgiving of any voids or mismatch. Black would have been easier. But I haven’t done “easy” on anything else.