2026 Integra Rear Sound Deadening

[XpoH]

The OEM stuff kind of sucks and if you put the CLD on top of it it’ll help the metal’s resonance but more effective to apply directly on the metal. I figured I’d spend the time to scrape it, since it was a simple job just labor hours to get it done. I want to put some additional insulation as well and this gives me a little more room.

That makes sense. I'm just not sure how much difference it would make, especially on a new car, but applying it directly to the metal does sound more effective.
btw, are you planning to add some foam like material on top?

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[Boxen]

That makes sense. I'm just not sure how much difference it would make, especially on a new car, but applying it directly to the metal does sound more effective.
btw, are you planning to add some foam like material on top?

Yep, plan is to lay down some thinsulate all in the rear. Then doors and wheel wells next, maybe firewall but I don’t love the idea of tearing up the carpet.

 

[bisquick]

The OEM stuff kind of sucks and if you put the CLD on top of it it’ll help the metal’s resonance but more effective to apply directly on the metal. I figured I’d spend the time to scrape it, since it was a simple job just labor hours to get it done. I want to put some additional insulation as well and this gives me a little more room.

You’re correct that applying CLD on top of the OEM sound deadening is not as effective as applying directly to metal, but it’s incorrect to state that it amplifies the resonance; that does not make sense mathematically.

A similar example would be applying insulation to walls. Adding spray foam insulation (R-6) then fiberglass instillation (R-20) results in a total R values of R-26. The association is additive; same applies to acoustic resonance.

 

[Boxen]

You’re correct that applying CLD on top of the OEM sound deadening is not as effective as applying directly to metal, but it’s incorrect to state that it amplifies the resonance; that does not make sense mathematically.

A similar example would be applying insulation to walls. Adding spray foam insulation (R-6) then fiberglass instillation (R-20) results in a total R values of R-26. The association is additive; same applies to acoustic resonance.

Pardon my short hand, I should have added the word reduce or reduction. It’s not apples to apples comparing regular insulation either, CLD has exponentially diminishing returns when applied layer over layer.

In theory, applying to the metal or to the paste shouldn’t make much of a difference since the paste is a harder material and transmits vibration easily.

 

[Boxen]

I ended up touching my fender liners and wheel wells. It has not made a huge difference on highway/old road drone, but bumps and road imperfections are noticeably quieter. My apartment complex is paved in brick, and I can no longer hear every brick I drive over.

Front:

Just talking flat noisy panels, the front wheel well has a large flat section that goes straight to the cabin on each side and the fender itself could stir some resonance.

Rear:

This felt more like a waste of time as the other side of most of this area I already hit on the inside, so I aimed for some areas the internal treatment would not have covered. The felt liners felt like a waste of time, but I have a lot of extra CLD and so why not.

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