reducing interior noise - what to install beneath carpet? CLD type mat? jute mat?

Sweet_Johnny · Feb 4, 2025

The funny thing is that this is similar to jounce/ Grand Prix/ fender/ radiator bars. Each one kind of does multiple jobs but they don't make huge differences unless combined. I'm genuinely curious just how much difference could be made by adding the jute and nothing else.

Possible key point for a T-Top: the CLD & CCF both adhere directly to the floor like super sticky tape, likely to not want to come off easily later. The foam is a gamble- it may not stick well, it might tear into pieces, it might roll up like lint. If you need to remove a CLD like "the Mat" then just cut the floor out or putty knives, a wire wheel, picks, and a heat gun will be your arsenal for a while. The jute can be pulled at any time if not glued to the floor. And even then you can remove it fairly easily. If future rust propagation or remediation is a concern then these attributes may factor into the decision.

paradigm · Feb 4, 2025

Sweet_Johnny said:
The funny thing is that this is similar to jounce/ Grand Prix/ fender/ radiator bars. Each one kind of does multiple jobs but they don't make huge differences unless combined. I'm genuinely curious just how much difference could be made by adding the jute and nothing else.

Possible key point for a T-Top: the CLD & CCF both adhere directly to the floor like super sticky tape, likely to not want to come off easily later. The foam is a gamble- it may not stick well, it might tear into pieces, it might roll up like lint. If you need to remove a CLD like "the Mat" then just cut the floor out or putty knives, a wire wheel, picks, and a heat will be your arsenal for a while. The jute can be pulled at any time if not glued to the floor. And even then you can remove it fairly easily. If future rust propagation or remediation is a concern then these attributes may factor into the decision.

That’s one of my major concerns with CLD or CCF is it will promote rust. The rustiest area of my floor had CCF on it, which trapped water beneath to accelerate rust.

After a bunch of reading it appears that only a combination of CLD plus CCF plus a heavy mat would work the best but I’m lot about to do all of that. I’m going to get frost king insulation that is like jute and supplement the areas that I’m missing jute in under my carpet and fill them in with that and that’s it. I do not want to deal with any accelerated rust issues on my floor. I wired down the affected areas and sealed with KBS but who knows if it will come back or not.

Sweet_Johnny · Feb 4, 2025

paradigm said:
That’s one of my major concerns with CLD or CCF is it will promote rust. The rustiest area of my floor had CCF on it, which trapped water beneath to accelerate rust.

After a bunch of reading it appears that only a combination of CLD plus CCF plus a heavy mat would work the best but I’m lot about to do all of that. I’m going to get frost king insulation that is like jute and supplement the areas that I’m missing jute in under my carpet and fill them in with that and that’s it. I do not want to deal with any accelerated rust issues on my floor. I wired down the affected areas and sealed with KBS but who knows if it will come back or not.

I treated some rust in my rear seating area and sealed it with the appropriate spray paint. I plan to use CLD, CCF, and Frost King though I really should cut out any rusted metal. Also, the FK is a popular choice in the RV and Vanning world but some have voiced concerns over moisture retention in certain scenarios. It's treated with boric acid to not grow mold or mildew but I don't think that's a 100% guarantee. If you're going to tape it to the mass backing of your carpet then I recommend linen repair tape for about $7 on Amazon. It sticks very well to the FK and you've got to be extremely careful removing it.

paradigm · Feb 4, 2025

ELCAM said:
The jute is more of a higher frequency deadener. The rubber like stuff on the large flat areas is for lower frequencies, the rubber changes the resonant frequency of the panel so it doesn't act like a resonator for the low frequency sounds.

I feel high frequencies are where the annoying noises are, so I think jute may be more effective for me than adding adhesive butyl rubber mat with a foil layer to the panels, unless has noticeable resonance with a simple touch of a metal object, then I would consider adding CLD to that panel.

I am reading that the only way CLD is effective is if the car is 100% covered, not sure how true that is. I am reading a ton of different crap to be honest, with mixed results. Some swear by the multi layer approach, some say an entire car covered in CLD makes little to no audible difference and is only useful in audio setups.

Yeah I am going to just add the frost king pretend jute in places there is no jute and call it a day. Maybe add some CLD to any large flat panel with no bends through it that could potentially have a high amplitude of resonance.

Clone TIE Pilot · Feb 5, 2025

Don't use roof flashing tape, its asphalt instead of butyl rubber. It doesn't absorb vibrations nearly as well as butyl nor is it as heat resistant. Autobody products usually have much higher heat ratings than home improvement products. Insulation can quickly add weight to your car.

paradigm · Feb 5, 2025

I ended up installing frost king wherever the carpet did not have jute backing. Then I installed a sound deadener insulation mat I got from ebay between the rear of the backseat and the trunk to replace the old tar divider. Then I installed amazon basics sound deadener along the roof as that is the largest panel I came across that seemed to have a lot of flex; the deadener really changed the resonance of the panel.

Sweet_Johnny · Feb 6, 2025

I think you bought some decent stuff and applied it in a way that'll definitely help. The heavy factory panels acted like a bit of a sound barrier in addition to the jute that was applied to the backs of them, and I believe there was one for under the rear seat as well. The only thing you could change would be to add some type of heavy mat in those areas, but what you've already done is still much better than what you had before.

69hurstolds · Feb 6, 2025

Personally, I'd be concerned with that amazon basics overhead stick on stuff. While it may be ok now, in the summer heat, will it fall? I don't know that answer, but you can't just stick anything up inside the roof like that without having some very good adhesive. Just a watch-out.

paradigm · Feb 6, 2025

The amazon basics deadener has pretty good reviews, so I went with it. If it does fall in the heat, ill just remove it.

For re-installing interior trim, is there a technique you guys followed? Start from the bottom of the interior and work upward, or does order not matter? I am going to try and reinstall all the trim except for whatever holds the headliner in as I am still waiting on a backorder (or I may make my own).

69hurstolds · Feb 6, 2025

Work mostly from the top down always seems to work for me, but yes, start anywhere you wish. Just put the part on in order if they overlap, obviously. Like headliner first, then quarter panel side and T-top trims, etc. I would try to wait as long as you could to put the carpet in as you work on the other junk, simply from a protection point of view. You could install it any time you wish, actually, and simply cover it with a tarp or something, but I know me and my luck, so just do what is comfortable for you. You will find your rhythm.

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