Sound proofing (another thread)

[Almonds]

Have just bought some non-dynamat sound proofing material that isn't noisekiller for the 110. Thought mayaswell do it while I've got it in pieces.

Spec is something called Superflex, supplied by Wayside Adhesives. Anyone heard of 'em?

Will post review and before/after video for full comparison once I've finished doing the roof, floor, tub, wheel arches, footwells and bulkhead in a couple weekends...

Alm.

 

[bankz5152]

Please do. Need pics aswell, im doing mine in the summer too. Decided to go for Fatmat Xtreme £140 should do the whole landy, similar material to Dynamat.

 

[D90mitch]

Make sure you put come closed cell foam or automotive soundproofing backed carpet over the top of the matting stuff. If it isn't already self adhesive, try to use high temperature spray glue as it won't start to peel away when things get warm. The other layer makes a massive difference. There ain't much I haven't done when it comes to soundproofing me 90

 

[james6546]

I plan to do mine soon too.

Only thing stopping me doing the side panels is the dents. I don't mind 90% of the dents on my 90, I just don't like the ones on the side panels that have been made from the inside out. Will a bodyshop be able to get them out you reckon? I know its aluminium and it stretches.

 

[Almonds]

I've seen the Fatmat and Dynamat stuff, but I couldn't justify the cost given size of 110 interior -although I realise you only need around 40-60% panel coverage to change the resonant frequency of any panel, this would still cost around £400. To boot, I'd sooner not worry about tearing expensive foil if I need ever need to remove the transmission tunnel for a clutch release bearing replacement etc.

Photos should show that the stuff is the typical adhesive-backed bitumen sheets with a cross-hatch pattern. There's no bitumen smell, but it'll be interesting to see if this stuff stinks up the cab in the heat of summer (has that already been and gone?).

I've also bought a cheapo, disposable Silverline seam roller to use. I plan to etch the areas being damped to get good adhesion with 400 grit or similar. Closed cell foam is decent for a top lining, should keep heat / cool in, but it won't reduce huge amounts of noise as the amplitudes of the panels are low - I was thinking EVA, PE, PU or simply a 6-10mm carpet underlay but I've not come to a proper conclusion yet.

Panels that I'll be doing in the coming days: tub loading panel, rear arch boxes, second row seat foot wells. After I've Kurust'ed the nasty bits, and reinforced the tub bolts that have ripped through.

**Must make a video on the commute home to record sound levels :car:

Alm.

 

[Almonds]

And Superflex photos...

 

[Almonds]

I plan to do mine soon too.

Only thing stopping me doing the side panels is the dents. I don't mind 90% of the dents on my 90, I just don't like the ones on the side panels that have been made from the inside out. Will a bodyshop be able to get them out you reckon? I know its aluminium and it stretches.

I've got a nasty Corsa shaped dent on the PS arch thanks to a t-boning, baseball cap wearing tool. He managed to bend the radius arm by about 2degrees which meant it sounded like there was a squirrel living under the bonnet. Corsa was a flat-pack write-off, meanwhile I drove home.

This is another job on my list, and at the risk of hijacking the thread, I've included some photos. Planning to use a heat gun and a panel mallet to tap out this wrinkle in the wing, and in the sill. A cheapo fibreglass kit should fix the rip in the arch.

Good video on Alu panel work: https://www.youtube.com/watch?v=9moYO-WWhaQ

 

[bankz5152]

Personally when it came to seams around parts I may remove I was going to cut the Fatmat to the size of the pannel.

 

[Barbados]

Doing over my roof lining and behind rear seats/baggage area. I removed the bench seats, make ply wood sections which I will then cover with acoustic box carpet including the floor.

Have you guys ever thought of using fibre glass insulation in the roof? This might keep the interior warm in winter and cool in summer while providing sound deadening.

 

[Almonds]

Doing over my roof lining and behind rear seats/baggage area. I removed the bench seats, make ply wood sections which I will then cover with acoustic box carpet including the floor.

Have you guys ever thought of using fibre glass insulation in the roof? This might keep the interior warm in winter and cool in summer while providing sound deadening.

Are you looking to apply the fibreglass to the roof directly, like a wet lay-up?

Little more info on the "Superflex" which is actually a 3M product in disguise:
3M? Sound Deadening Pads suppress noise and vibration. 19.7 inch squares.

Alm.

 

[Barbados]

Are you looking to apply the fibreglass to the roof directly, like a wet lay-up?

Little more info on the "Superflex" which is actually a 3M product in disguise:
3M? Sound Deadening Pads suppress noise and vibration. 19.7 inch squares.

Alm.

No the spongy insulation which can be separated by layers intended for homes.

 

[Almonds]

I'm no expert, but I reckon they'd be good for heat insulation, but poor for acoustic insulation. If I understand the issue correctly, what you want to do for acoustics is either:
1. Stiffen the panel, which means you increase the resonant frequency - this takes the vibration (hopefully) above audible level. Could be done by filling cavities with expanding foam or similar.
2. Increase mass of panel, which results in decreasing resonant frequency (below audible range) - This simultaneously increases the critical damping of the system, so it doesn't resonate, i.e. it is deadened.
3. Decouple rattling interfaces.

Hopefully what I've said isn't utter guff.

Alm.

 

[Almonds]

Managed to get some numbers for sound levels using Decibel 10th -admittedly this app isn't the best way to do it. I stuck the phone to top of centre cubby box and drove from 0-70mph:
Max. reading: 102 dB
Average reading: 92 dB

Will be proofing some panels tomorrow, so will do same test after applying the 3M stuff.

Alm.

 

[flat]

Managed to get some numbers for sound levels using Decibel 10th -admittedly this app isn't the best way to do it. I stuck the phone to top of centre cubby box and drove from 0-70mph:
Max. reading: 102 dB
Average reading: 92 dB

Will be proofing some panels tomorrow, so will do same test after applying the 3M stuff.

Alm.

Didn't realise you could get a decibel-o-meter as an app. Might try it in my 2.5na which has NO soundproofing

 

[Almonds]

Didn't realise you could get a decibel-o-meter as an app. Might try it in my 2.5na which has NO soundproofing

I would be careful with the app, some don't read over 100dB, and most of the free ones are garbage for providing any useful numbers. I took a reading in a quiet room (as far as I could tell): 50db average, 62db peak. That's the baseline I'm working to.

 

[flat]

Okay cheers

 

[Almonds]

Update: I have removed all trim and laid out the Superflex in the rear rub and second row foot wells, I have also covered this area (tub only, not side panels) with 7mm PE Underlay foam (£18 for about 15sq.m -yes I know it's flammable). Massive difference in terms of road noise, but can't post any numbers as have the dash off, and am re-wiring / fixing holes in bulkhead at the moment.

Next set of work is to do the seat boxes, bulkhead and transmission tunnel in the same fashion. Will take photos and post this weekend...

Alm.

 

[AJJackson1]

If that underlay foam has made an audible difference it must have knocked at least 6dB off. I am highly intrigued to find out what your app says as I'm looking to do this to mine over the summer. That stuff is a great price too!

 

[Almonds]

Photos of rear tub and second row...

Got a before and after video when I did the second row seat foot well panel (very scientific). This should give you an idea of how the 3M stuff works. Description will have more info. Will post link after photos.

[BEFORE]

 

[Almonds]

[after]