Thinking of putting a whole load of sound deadening material into the coupe when I put my new sound system in....

Personally I think dynamat and the like is a bit of a rip off. You get all kinds of sound deadening materials on the market, but dynamat is expensive because it is for car audio and not buildings/floors.

Looked at all the threads on here recommending flashing tape, but I'm not sure I like the idea of the smell.

I've found some laminate flooring underlay which only costs £23.49 for 10.2 square metres. It is meant to reduce sound by 20dB. High Performance Underlay

Or even cheaper at Screwfix when they get it back in stock: Screwfix

If it really works in the car to provide a 20Db barrier then I'm going for it. 10sqm for that price means I could put it down under the rear seats, rear panels, door and still have enough left to do the inside of the firewall. Might even do two layers at that price.

I'll report back on how well it works :-)

Underlay won't stop your metal panels from vibrating, you need adhesive contact onto the metal surfaces to eliminate this.
You could put the underlay over this as a secondary barrier but a thick felt is just as efficient.

There is no smell from the flashing tape, i've got rolls of the stuff in mine!

+1

Certainly the stuff in B&Q doesn't smell not even in the height of summer (ha! that mythical one hot day in August!) or with the heating turned up full bung, like us old gimps prefer!

Save your money for the components and buy flashing tape. Very worst case scenario: after a few months you discover you bought a different brand of tape that does smell and you have to take it out, which is simple enough to do.

It is also worth noting that even as underlayy the above is terrible. Get some some timbermate silent gold underlay it is infinately better.

Not getting into the debate about flashing tape vs sound deadening,but there are other cheaper brands then dynamatt.
I spent a lot of money on my stereo and thought another £50 was worth it,do it once and all that!
I brought the silent coat stuff and i'm happy.
you could always mix and match "proper" sound deadening like silent coat or e-dead etc,with the flashing tape for best of both worlds.

So which flashing tape brand?

Any links?

Hows about this one? Is this the right kind of stuff?

Flashing Tape (Screwfix)

The only stuff I could find on B&Q's website was tar backed roofing repair flashing tape.

That's exactly what I used. I did both rear 3/4's when fitting my 6x9's and both front doors and had a load left over. Works a treat and you get a satisfying thud when you shut the doors.

In my last Coupe, I used two rolls of B&Q 4" flashing tape in the back half of the car (never got round to doing the doors)

I did the inside of the rear quarters, the rear seat base, the rear seat back and most of the sides of the boot

It made a noticeable difference to general road noise, AND there was no smell at all

Next time round, I'll do the insides of the doors as well

Personally I love the road noise (tyres, wind and exhaust) - they remind me that I am driving something rather quick and special, rather than a sanitised German or Japmobile.

What I really hate is the lack of radio reception. The sound system in each car is superb when listening to CDs or iPod, but I need my BBC 5Live and Radio 4 TMS. I will be banned from FCCUK, but I need an external ariel unless I win the lottery and fit some extraordinary DAB system..

I am looking at sound deadening mine too, if go down the flashing tape route, will this (or any other adhesive mat) be a problem should I need to get any car park dints removed? I have heard it is very sticky and can cause damage when removed - is this factor eliminated with the use of a heat gun/hairdryer?

I only sound deadened the inside sections of the panels since these were the sections which the speakers were attached to. It worked well for me.

May just do that then :-)

Just cut a hole in it

Great idea! I'll use a hole saw drill bit to keep it nice and neat!

Any sensible answers out there?

It easily peels off. Dints can be repaired and another piece of tape installed. Simples.

Thanks Stan!

A trip to B & Q at the weekend then!

If you can't find any at B&Q then I just bought a roll of 10m x 225mm for £15. Screwfix Flashing Tape

Cheers Spookly.

Probably just going to do the rear quarters for now, but out of interest, how many rolls do you reckon I would need to do the floor pan?

Off the top of my head I'd reckon on one roll or thereabouts.
I bought one roll the other day and as soon as it isn't raining I'll be doing inside door panels, rear quarters, and possibly the floor too.

Doing the roof makes a big difference too.

We should maybe stress on the inside!

The flashing is good but remember that stuff £ for £ is really only good for stopping sound resonance (panel vibration). If you want to reduce cabin noise then you'll want some kind of sound barrier.

Have a read of this to get a better understanding of what needs to be done to a car to get the best out of you efforts.

Yes I don't understand why people stick heavy stuff in their Coupes when it doesn't even insulate better than the usual foam stuff on the inner panels/doorcards.

I've used the same material on both Coupe, Argenta and Punto and it works very well, and weighs close to nothing. Full car = around 3kg extra? And it's usually dead cheap.

This is my inner rear panel of the Punto: (this also has a thin foil layer for temp insulation) http://www.garaget.org/?car=108840&image=2091800

I suppose there's a reason why cars have foam in such places factoryfitted. (Not the Punto nor Coupe though..)

So what exactly are you using Per?

And if you're ever over to Belgium, you're free to come over and do mine.

Sorry, should have had a link!

This is what I've bought, should be around outside Sweden too..

http://www.biltema.se/sv/Bil---MC/Bil-tillbehor/Ljuddampare/Ljuddampningsplatta/

It's self-adhesive but a string by the glue-gun around the edges locks it in place.

For sure, will visit the next time in Belgium!

Looks like old mouldy cereals.

What thickness did you go for? From my splendid Swedish I derive that these are actually specific for boats, cars,...?

Very good! It says "cars, boats, campers etc"

Depends; on the doorcards it's tight so I used 10mm more, in the rear panels there's more empty space for the 30mm ones..

Obviously there's a bit of trial'n'error to fit the doorcards for example, but this foam is easily cut away where you need to.

All this is getting confusing now!

Per is your recommendation a standard sound insulation that should be available from my local ICE retailer? Just had a look at your link but my Swedish is a little rusty - by rusty I mean worse than my old X19... AKA none existent!

I wouldn't dare recommending things but yes this is what I used and it got pretty silent!

I just installed new speakers and put flashing tape in all round. Does provide some improvement in sound deadening... possibly not as much as proper stuff, but then it only cost £15 and I've got 1/3 left over.

I have just been told that foam camping/sleeping rolls work great. Can anyone confirm this?

Sensible + points
It's closed cell and does not soak up water.
It's quite dense so has a good ability to cut noise.

I think they sell them in the pound shop and would make the floor nice and soft

To revive this thread, I'm doing this sometime this week hopefully. Having read through this thread I'm none the wiser.

From what I can gather, flashing tape will reduce vibration of panels. If this is the case, why is it being used as sound deadening? It looks too thin? Dynamat has been said to be too expensive for the results you get but I'm not seeing a viable alternative from what I've read so far, unless I've got flashing tape all wrong?

What definitive product should I use to reduce noise inside the car? I'll be applying whatever material I go for to the roof, door cards, rear panels, under the rear seat and the floor pan.

----------------------------------------

ETA - Having just seen the price of dynamat they can jog on!

Flashing tape reduces or kills resonance, which is a source of noise in itself. And yes it's thin, but it's better than just a 0.2 mm sheet of tin or plastic.

There are however plenty of materials to choose from, and there are indeed cheaper brands than dynamat. Do a search for "Peel & Seal".

These come up as good alternatives as well:
http://www.mcmaster.com/#9709t39/=bjlpmj
http://www.edesignaudio.com/index.php?cPath=1_24
http://www.b-quiet.com/vcomp.html (lcomp was supposed to be slightly better but contains leadwhich has risen very much in price)

All those mats are mostly just bitumen so not very different from regular roofing material. Without the gravely layer. The alu foil is meant to get rid of the heat (noise is converted to heat). That's the theory.

Yes but does it actually reduce outside noise infiltrating in the cabin, or does it just stop structural noise (which I dont experience with my coupe)?

You'd be surprised. But as a sound absorber it will only stop high-frequency noise (airborne) and stop low-frequency transmitted noise ('parasitic' vibration).

Check out the vcomp though, that is quite effectove for low frequencies as well.

Like I said if you have a read of this it breaks it down for you.

http://www.sounddeadenershowdown.com/cgi-bin/index.cgi

Flashing tape would be what they call the CDL tiles part.

Have a look on Ebay for the closed cell foam and Mass Loaded Vinyl. I'm trying to find a cheaper way to do the second and third parts but I'm having no luck.

That looks like a really useful link. Thanks! I'll have a read

Im in the process of looking to do the whole of my misses coupe so its ultra quiet and like you all know the price of sound deadening is very expensive so il just keep an eye on this thread

BINGO!

Here's the closed cell foam. I've just ordered 4 rolls with free P&P.

Now I just need the MLV.

That's a great idea, I'd be interested to see how well this works - please report back!

like I said check out the pound shop for these.

Do make sure though that the pound shop ones are closed cell foam (not the cheaper open cell) and check the thickness.

The missus has informed me they are closed cell with a smooth surface. Dont know about the thickness though.

An automotive OEM I have worked for uses Porofib (http://www.hordastans.se/?articleId=73&lang=UK&topId=6.4) and Lamiflex (http://www.hordastans.se/?articleId=74&lang=UK&topId=6.4).

I believe partially closed cells are the way to go then it comes to foam. The foam business is tricky since not all foam are good sound absorbants. The best bet is to use recycled textile fiber such as Porofib. Got both kinds which I have applied to rear quarter panels and door panels.

Need something for structurally borne sound as well though, such as these: http://www.hordastans.se/?articleId=75&lang=UK&topId=6 to sheet metal. For example, under the rear seat.

Generally I would recommend a good technical foam or textile fiber applied to the inside of the plastic panels for absorbtion and heavier stuff such as the ones showed in the second link structurally borne sounds for body panels.

<edit:> After looking around, bitumen-based heavy layer mats will be the plan for me for body panels, should be readily available in the UK as well.