dynamatt or resonmatt?

[tanz-e]

My rusty old GQ's rings are on the way out so im looking to do an intire new build.
I wanna build a new GQ and sound proofing will play a major role in the new car. I spoke to a bloke in dandy who does custom interiors and he schooled me on resonmatt and dynamatt.
Im basicly looking for someone to back up what ive been told. Are these the best products? Would multiple layers give me greater noise reduction and is there any problems with the products?

[mikemax]

i used dynamat on my gu dx ute and its about 40% quieter now. I'm happy. it took me 3-4 hours.

apparently the vibration makes the panels act like the skin of a drum and using dynamat reduces this resonance. i got a bulk pack for $220 from ebay and did the floor, roof, back walls, transmission tunnel and got heaps left for the bonnett and doors. You only need to use it on 50% of the total surface area to be effective. Some stereo shops put it eveywehere.

then use closed cell foam from rubber places to put over the top for sound insulation/ absorption. I used 4meters @ $14/m and didnlt glue it down so its easier to clean after the next river crossing.

normal vinyl over the top.

[crankycruiser]

I did a bit of my 80 ute with dyna matt when we cut it.. it is really good.. also put it on the tranny tunnel to cut back on heat and it worked well for that too.

[80's_delirious]

I replaced my carpet underlay n my 80series with 10mm foil backed closed cell foam. It gives thermal and acoustic insulation, it made a huge difference to both heat and noise in my 80 and it wasn' t expensive. less than $100 to do the entire floor pan. Dont leave any gaps if possible.

[coops62]

Jaycar also make a sound deadener/heat shield and I've just put some in the rear of my wagon. Would imagine it to be a bit cheaper than Dynamat and can't see how it could be any less efficient. Won't know how good it really is until I do my doors but I think it improved the rear section considerably. I won't know for sure until I do the doors I guess but I am happy to this point in time

http://www.jaycar.com.au/productView.as ... rm=KEYWORD

[hokey]

how does this stuff go with water? got no carpet in my patrol and just need something to keep the exhaust heat off the passenger floor

thanks

[KiwiBacon]

I just did a price check on dynamat vs jaycar stuff. NZ pricing.
It came out for the same price as a 3.3 square metre dynamat pack (36 sq feet) you get almost 4.2 square metres of jarcar stuff. The jaycar is 1.5mm thick, dynamat is 1.7mm thick.

What is resonmat?

[V.W.Dave]

As long as your not taking it swimming you can get house insulation bats in th roof and upper walls/ pillars . It works surprisingly well and it's cheap.

[shakes]

As long as your not taking it swimming you can get house insulation bats in th roof and upper walls/ pillars . It works surprisingly well and it's cheap.

As can the big silver sun visors you get for your windscreen's

[coops62]

I just did a price check on dynamat vs jaycar stuff. NZ pricing.
It came out for the same price as a 3.3 square metre dynamat pack (36 sq feet) you get almost 4.2 square metres of jarcar stuff. The jaycar is 1.5mm thick, dynamat is 1.7mm thick.

What is resonmat?

Did you factor in the x 10 purchase discount? Savings to be had there as I used 6 rolls for the rear of my wagon

[KiwiBacon]

Did you factor in the x 10 purchase discount? Savings to be had there as I used 6 rolls for the rear of my wagon

Yes that's with the 10+ price break. It works out that 14 jaycar matts are just a fraction more area than the 36 square foot dynamatt pack. I don't think I'd need 14 rolls, but the comparison was interesting.

How good is the adhesive on the jaycar stuff? Any sign it's going to get hot and fall off?

[coops62]

sticks like poo to a blanket but I don't know how long it will last for. Am fairly confident though as it seemed like quality stuff. They make some good audio gear. I didn't realise the cost comparison was so close though. Won't hesitate to tell the sound shop to use Dynamat in doors when I upgrade speakers next

[KiwiBacon]

Hmmm, there's a guy in this thread complaining about his jaycar sound matt falling off.
http://www.mobileelectronics.com.au/for ... deadening/" onclick="window.open(this.href);return false;

Yet in this forum they say the jaycar stuff is "brown bread" as it's known in the US. Which is generally very highly rated.
http://forum.pulsar.org.au/showthread.p ... f4d7d4e2de" onclick="window.open(this.href);return false;

So, just to sum up.
Jaycar AX3684 is the brown bread stuff (bitumen), it's sold by jaycar in 330mm square sheets.
http://www.jaycar.co.nz/productView.asp ... rm=KEYWORD" onclick="window.open(this.href);return false;

Jaycar AX3687 is the lighter butyl stuff, larger sheets (900x330), similar price as above.
http://www.jaycar.co.nz/productView.asp ... rm=KEYWORD" onclick="window.open(this.href);return false;

Jaycar AX3689 is a combination Butyl and foam which will be lighter again but be the best thermal insulator. I think this stuff would be best for doing the car roof for thermal reasons.
http://www.jaycar.co.nz/productView.asp ... rm=KEYWORD" onclick="window.open(this.href);return false;

It would appear Dynamat extreme would be comparable to the brown-bread AX3684.

[Mulcahy]

So no one that has this stuff has sayd how it goes if it gets wet a few times, i am interested as i am looking to do a ground up rebuild on my hj47 and was looking to paint the floor and inside of doors with a second skin spectrum sludge and then placing dynamat over the top, is this a waste of money or will it give me alot nice car to sit in

thanks Shane Mulcahy

[KiwiBacon]

Any stick on deadener can trap water (hence rust) underneath it. You're probably better to go with matts which aren't stuck in and can be removed if you get it wet occasionally.

[KiwiBacon]

I've found something very interesting today. The building industry uses a foil backed, self-adhesive bitumen cored tape for roofing and sealing around windows. It comes in rolls up to 200mm wide and is a hell of a lot cheaper than products sold for car sound insulation.

The local building supply outfit priced a roll of 150mm wide, 25m long (3.75m^2) at a little over $NZ100. That's about $30 per square metre. Dynamat is $NZ220 for 1.8m^2 or $122 per square metre.

If it's not the same stuff, it's very close. I can guarantee 4 layers of roofing tape will kill more noise than 1 layer of dynamat at the same price.

[80's_delirious]

Flashtac?

Putting on 4 layers would add a lot of weight, not to mention having to do the whole process 4 times.
I'd look at a single layer to dampen any resonance on panels, then add a layer of foil backed,10mm closed cell foam. Its a good thermal insulator, and good for sound also. Its cheap and is available with a self adhesive backing.
The two in combination will give a better result than either by them itself.

[TheBigBoy]

Im just about to strip, clean out, rust prep and insulate my truck. I didnt get dynamat I went with this dbkill stuff as the guy is just in moreton.

http://www.ebay.com.au/itm/Car-Sound-De ... 336d056caf" onclick="window.open(this.href);return false;

I will do all my panels and cavitys. Floor, wheel wells, door cavitys. I also would really like to do the roof and under bonnet aswell. Maybe have to buy 2 lots. The only part I am debating. Is to run some wiring underneath? or should I extract it all to ontop.