Sound Deadening

[riceandpho]

if we need to go deep in this topic, the guy in the 5th gen [MENTION=117778]lowcel[/MENTION] do sound competitions, so his install might be a good guide.

 

[snowboardwcu]

That’s kind of how I looked at it. I did more than 25% coverage with the butyl layer, but nowhere near 100%. Probably in the 40-50% range overall. The butyl layer is already heavy, I know I’m already adding weight, I just didn’t feel like doubling the amount of weight I added. Between weight and cost, I didn’t feel the need for all that extra coverage with the butyl layer.

Now the foam layer is a different story. It’s lighter, and I should have got closer to 100% coverage with that.
I did just order the Noico 315 mil foam mat. I’m going to put that in my A pillars, and along the firewall that I can get to without tearing too much up. Then I’ll systematically go through and take door panels off and maybe get to the cargo area again and essentially add a 3rd layer and make sure I cover as much surface area as I possibly can.

Not sure what you’re referring to with the CCF. Right now I’ve done just the two layers.

yeah this is what i'm getting at. your approach is close to what i'm planning and i agree with everything you said.

FWIW, from my reading, the three layers work in unison. butyl layer dampens vibratory sound, the CCF (closed cell foam) acts as a cushion/air gap between the butyl & foam (MLV mass loaded vinyl) so anything that gets through the butyl and air gap is then absorbed and dissipated as heat through the mass loaded vinyl. from what i can tell the CCF layer may actually be more important than over coverage of butyl. i guess you dont want the MLV directly touching the butyl.

you have a link to the foam? just want to compare what i've found.

 

[snowboardwcu]

It may well be overkill, and I get that the butyl lhas a different role so to speak, but I believe that the more layers between the sound and the ear, the better. I even read one site where someone who knows a lot more about it than me said that while it’s counterintuitive, the layer thing is not the case. In other words, more layers aren’t necessarily better. Maybe he’s right, I don’t know, but I do like how quiet my truck is.

well yeah it isn't necessarily more layers as it is what the layers are. i would just rather spend the money on CCF & MLV and do full coverages with those for the gains (losses, really lol)

 

[MT Runner]

I was also worried about the airbags and so on but the A pillar turned out to be a piece of cake. There are two little covers on the handle that you pry off, and remove the screws underneath, take off the handle & then the panel just pops off. I’ve had it off several times to run wires and add the Noico with no issues.

I still have more to do on the interior firewall, but it’s not hard to remove the kick panels so I did them.

So I got my box of Noico 315 mat today and tackled those A pillars. You’re right, those are SUPER easy. Not sure how much of a noise difference there will be, I haven’t driven it yet. But for how easy that is, it’s a no brainer. I basically cut a bunch of rectangles and squares and stuck them to the backside of the trim piece and covered the whole thing. Took half a sheet of the mat per pillar piece.

Next is the kick panel area.

 

[Bluesky 07]

So I got my box of Noico 315 mat today and tackled those A pillars. You’re right, those are SUPER easy. Not sure how much of a noise difference there will be, I haven’t driven it yet. But for how easy that is, it’s a no brainer. I basically cut a bunch of rectangles and squares and stuck them to the backside of the trim piece and covered the whole thing. Took half a sheet of the mat per pillar piece.

Next is the kick panel area.

Every fraction of a decibel makes a cumulative difference.