Got my headliner off in my 01 xj. I actually kinda like the look and feel, however, its pretty noisy on the highway. So its time to redo the liner and get it back in. Before I do, I think I want to add some extra deadening to the roof.

My day job as a sound engineer and having to know a little about acoustics and sound proofing tells me 100% coverage with these dense membranes is not much more effective than 50% coverage spread over the surface. You are not sealing the cab with these materials to keep sound from getting in, but slowing the movement of them, therefore reducing noise generated by the metal itself.

For sound proofing, you would do better focusing on door and window seals, also filling any holes or gaps where you can.

What has been yalls experience with this? What brand did you go with and why?

 

For what it is worth I did some and started a thread on another forum.
Please realize that I did not have a clue then and still don't now. LOL.
But.......

https://www.jeepforum.com/forum/f177...sport-4086497/

Oh and the thread is not done cause I have yet to get to the floor.
Even after all this time. MLOL.

 

There does seem to be a lot of misinformation and placebo around this topic. I have a few tools to actually take measurements before and after. Maybe that would be useful to some. Actual hard data.

What product did you end up using? I don’t want to use the one that smells like tar. :x

 

I used the DynaMat like I said in the thread for the actual sound deadening material.
Frankly I think using any of the other ones, except maybe the Peel N Seal, would be fine.
The one thing I did notice was the change in what I believe they call resonant sound.
I would tap on a panel before applying the DynaMat. Then tap on it again after.
The panel went from making a more "tinny" sound to more of a "thud" when tapping on it.
And it did sound like I was hearing more of my music after.
If that makes any sense. LOL.

 

I used a decibel meter in mine to see where the loudest part of the vehicle is. By far, it's the floor closest to the firewall. I have a huge pack of KilMat I bought to lay down, but I kind of want to pull the dash and coat the firewall first. I've driven without carpet, and also without a head liner. The carpet makes the most difference in noise reduction. If you're going for broke, do the whole thing. If you're looking for bang for the buck, do the floor since pulling the dash is a way bigger PITA than just the carpet.

 

I to do the same thing as you for a living, HAHA my stereo still is not that great in my Cherokee.
But to be honest I find myself after events, or even time in the studio just wanting to rest my ears a bit.

SILENCE!

When I was going through the Jeep my first goal was to tone down the resonate metal roof.
So I have used FATMAT, and Dynamat, with varying results in different vehicles.
I have Rattletrap in one of my FSJ Wagoneer's ....................... It did quiet down the metal. But I don't think any of those products by themselves are the perfect solution for what I am going for.
In my Cherokee I tried something different and used FrostKing Duct Insulation which is a sticky closed cell foam with a heavy aluminum foil on the outside. It did tone down the quarter panels, roof, and cargo area quite a bit, but I am still not happy with everything. The quarter panels, doors, and roof have a nice thud now, instead of the tin can sound.
In the drivers area I used a product called Thermo Gard FR.
The inside temp in the Jeep went down considerably in the summer, and noise mitigation was greatly improved, but not quite where I want it to be yet.

You are spot on when it comes to sealing holes, making sure seals (weatherstripping) are in good condition.

I am doing some mods this week to the interior of the Cherokee, so the headliner will be coming down.
In the process I am going to install more of the Thermo Guard up in the ceiling, and in the cargo area of Jeep. It will mount right over the duct insulation.