I've spent a good bit of time on this subject. I wanted to glue foam padding to the underside of my roof and discussed it with a local auto upholsterer. He was willing to do it for me but warned that if the buggy was in the hot sun for long periods the glue usually melted and the foam padding would fall.
Thinking about the warning from the upholsterer and the weight of thick foam insulation I found a less expensive product similar to Dynamat which is sheets of sandwiched insulation with self-adhesive and installed it on the underside of my Honda roof. It reduces reflected noise and overall noise level in the cab but my cab is still noisier than I want. I bought two cans of the spray adhesive shown above and plan to use it on the rear wall of the cab with the seat back removed for access.
I also cut and fit the self-adhesive insulation to the entire cab floor under the Honda floor mat and around the seat base.
Here's a summary of what I have done so far and my thoughts on results:
My Tensor Regulator tires significantly reduced, almost eliminated , tire noise in the cab.
Lining the roof, floor, and seat base with self-adhering insulation panels has reduced, almost eliminated engine sounds in the cab.
What I hear now is gear noise from the sub-transmission and transmission (DCT).
My plan was to remove the seat back and glue thick foam or rubber insulation to the back wall of the cab
My reading and close-up vision is poor now in my old age so I try to avoid doing the millions of small and large "do-it-myself) projects I've done all my life.
I bought a big roll of 3/8" rubber insulation and two cans of the spray adhesive suggested by Lady01 above. My occasional yardman/handyman couldn't figure out how to remove the seat back so when I took my buggy to the dealer for the overdue 1800 mile service and a couple other chores I asked the service department to remove the seat back and cut and glue the rolled rubber sheet to the back wall of the cab.
They have done lots of accessory installation and are usually very helpful but this time the service manager refused. He had several real or imagined concerns and I was unable to persuade him. He apparently doesn't spend any time driving one of the noisy buggies and doesn't share my desire to reduce the noise level.
As an alternate plan I've asked the service writer to remove the seat back before I go to pick it up later this week. When I get the buggy back home I'll get my handyman to help and we'll cut the rubber into panels to fit the cab back. Several people have warned me that the adhesive will fail so I plan to wipe the cab wall down several times with paint thinner, spray the Lady01 adhesive on the cab wall, and carefully fit the rubber panels to the cab. I have several heavy duty hand held rollers to carefully roll the rubber tightly against the cab to ensure the adhesive adheres to the rubber sheets.
I'm not an acoustical engineer but from experience I know that if the rubber sheet is glued to the cab wall it will eliminate the rattle and "oil-canning" noise created by the engine and gear train.
I'll report the results when it's done.
If all this expense, effort, and frustration doesn't silence the cab I guess ear muffs is the only solution.
hondasxs.com
www.tractorinteriors.com
www.dynamat.com
