Sound Deadener: Dynamat or Second Skin? (1 Viewer)

[jtwopark]

use second skin for vibration dampening and a layer of luxury liner....the luxury liner will help the most with interior noise. In my scion Xb, i did 4 layers of the second skin but it did not make the drastic results i was expecting BUT, the luxury liner was what made the night and day difference!

 

[NLXTACY]

I used DynoMat Extreme everywhere. I got boxes of the stuff for 1/2 off so I bought three big boxes. Cheap compared to others now. In the LX its a HUGE difference. It's a lot of work but so worth it.

 

[tone33]

Do you guys take the old deading out?

Cuz that what I did in my old Celicas. It weighed aprox 35lbs when I finished. Ive use broken up dry ice and used a big screwdriver and hammer and comes out easy.

I'm not planning on it... I'm trying to minimize my work effort on this one...wasn't really a planned upgrade - had coolant dripping in cabin soaked through carpet in front floorboard, which led to stripping entire interior out... so it's turned into a "while I'm in there" thing for me. Besides I'm not sure I'd notice enough of a difference in loosing a bit of weight in the cruiser at this point for the effort required to remove it.

 

[DSRTRDR]

I used DynoMat Extreme everywhere. I got boxes of the stuff for 1/2 off so I bought three big boxes. Cheap compared to others now. In the LX its a HUGE difference. It's a lot of work but so worth it.

really, the LX is too noisy for you inside

 

[DSRTRDR]

I'm not planning on it... I'm trying to minimize my work effort on this one...wasn't really a planned upgrade - had coolant dripping in cabin soaked through carpet in front floorboard, which led to stripping entire interior out... so it's turned into a "while I'm in there" thing for me. Besides I'm not sure I'd notice enough of a difference in loosing a bit of weight in the cruiser at this point for the effort required to remove it.

and, from my recent experience removing all the deadening material in my 40 for the H55 install, you really do not want to spray glue anything in - use double sided carpet tape instead - even the FO (future owner) will thank you - as you will yourself if you keep the cruiser long enough

I bought all my sound deadening/heat reflecting material for the 40 at Summit

 

[NLXTACY]

really, the LX is too noisy for you inside

Absolutely. Especially when I spent over a grand on a stereo system and I didn't want things vibrating. For my 40 I chose rhino lining instead. I was happy with that.

 

[DSRTRDR]

dang, I guess I really need an FSM to find that vibrator . . .

 

[FZJOverland]

I use hushmat this is the same stuff oem uses.

 

[NLXTACY]

dang, I guess I really need an FSM to find that vibrator . . .

Uh oh you said a naughty word. Prepare for your demerit. Minus one point for you! Black hand cometh

 

[Timpanogos Slim]

But this is tar based yes? There are numerous posts on here about the pros/cons for tar vs butyl... and the butyl wins out in my book, from what I've read.

asphalt (Bitumen) and tar are not the same thing.

 

[tone33]

100 sq ft of quietcrap ordered! I expect it to arrive in the next week, will get it installed and post some pics and feedback here.

 

[SM Racing]

I used carpet padding for most of my truck. I went and bought the heaviest syntehtic carpet pad they offered. I expect its in the 10lb/sqft range. Guess I could weigh some scrap pieces. Its not bits of foam junk glued together like the cheaper foam. I cut to cover all the floor area, glued it inside the (to the back) of the quarter panels, all over the back area, etc. I am still getting the carpet and the rest of the interior panels back in place, but I expect to hear a fairly big change. It was $36 for the 4x8 piece from a carpet supplier.

I also used some tar sheet type stuff. It was a gift from a friend. I installed it on the insides of the doors, along the tunnel, etc. I also installed the foil bubble wrap type stuff around the sides and top of the transmission tunnel. I am trying to cut the amount of heat radiated through the tunnel.

 

[tone33]

I left the factory deadening in place. Used almost a full roll of 100 sq ft and it almost covered the entire floor. Sounds better, but I almost did not notice it right off. Seems that certain frequencies are affected and others are not. For example it didn't sound that much quieter on interstate at first, but I noticed I could hear the factory radio (which isn't great) much better than before. And conversations were easier to hear - I could hear my kids in the third row much better than before.

 

[coastsider]

I used the stuff from Stock Interiors, the foil lined mastic stuff and also installed the extra thick (40% more pile) molded carpet with the extra thick backing and love it. I don't recall what they call it but it comes in approx 1'x2' sheets and is easy to work with. I got the bulk pack and covered the entire floorpan before I put in the carpet which is a big jump from oem alone. They said it was overkill but I'm glad that I did. Cheers

 

[SM Racing]

I was reading about this since this thread started. The Dynamat type stuff isn't really design to quiet noise, its more for vibration. If you have a panel that sounds "ringy" when you tap it, having some Dynamat type stuff will help. You also don't need to cover the whole panel. Just about 25% of the panel. I used strips of the Dynamat type stuff on the backsides of the door skins, etc, places where there were large expanses of steel that could vibrate. I stuck little pieces on portions of panels that sounded hollow and "boomy". But I realized these additional mats do nothing for absorbing sound.

Hence the reason I used rubber carpet pad. It is 7/16ths of an inch thick sponge rubber. This stuff is significantly heavier than the shredded felt pad on the back of the factory carpets and much heavier than the cheap shredded foam found in most houses. I bonded some to the backsides of the rear quarter panels, covered the wheel wells in the rear, whole floor, and stuffed it inside the passenger kick panel area. I also put it on the tunnel. If I had pulled the head liner down I would have put some on the underside of the roof. I can definitely tell a difference in the noise levels in the truck.

 

[jhunhapi]

SM do you have any pics? It will help a lot.

 

[SM Racing]

Unfortunately I did a terrible job of taking action photos. Here are a few where you can see some of the insulation.

https://forum.ih8mud.com/showpost.php?p=8899769&postcount=64

I used two different types as the orange stuff was left over from doing my house and the LEE brand white/blue stuff is something I bought from Carpet One. I like the Lee stuff better because it has some reinforcement on both sides, so I expect it to be more durable. Although it should last for 20 years anyways.

I basically covered every flat surface I could. Lessons learned, use the HEAVY DUTY 3M spray adhesive. I used the Super77 and it doesn't seem to hold as well as the High Strength 90. I am using the 90 on my tow vehicle as I am doing the same thing inside. I want my truck quiet going down the road. You can also use the Loctite construction adhesive to hold certain areas as well. I used it for a bit in certain places, but it has to hold for 24hours before it drys. The spray adhesive is much faster.

 

[jhunhapi]

Tnks for the pics. What are those orange stuff?

My carpets are out right now. Im jst going on my options dont want to waste money. If it do the same job.

 

[nukegoat]

I've used an a-weighted and c-weighted spl meter to test the effectiveness of dynamat-like materials for car audio competition. They are almost completely ineffective at rejecting road noise. You use them to change the resonant frequency of sheet metal.

I spent almost a decade convincing myself the effort was worth it, but Ive conceded that it's mostly a placebo effect.

 

[SM Racing]

Tnks for the pics. What are those orange stuff?

My carpets are out right now. Im jst going on my options dont want to waste money. If it do the same job.

The orange is another brand of similar material. It just happened to be what I had left over when I did my bedroom. The white/blue stuff is the Lee brand I picked up at Carpet 1. The orange may be more common in your area.

You goal is to absorb sound, which this thick heavy rubber does well.