Lotus Elan

Sound deadening materials

PostPost by: Bigbaldybloke » Tue Jun 26, 2018 9:36 am

Before I fit my roof lining I was thinking a of applying some sound deadening to the roof.
I?ve seen Dodo Mat Dead matting advertised (eBay and other places). Has anyone tried this or similar materials.
I?m thinking of the roof and maybe the main areas of the floor and footwell.
This stuff is only 1.8mm thick, it will add weight, but it?s a road car not a track day car and I?m sure if I went on a diet I could easily loose more that the weight of the insulation!!!
https://www.dodomat.com/collections/sou ... t-hex-roll
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PostPost by: richardcox_lotus » Tue Jun 26, 2018 10:28 am

There have been previous (old) threads on here about the use of sound deadening paint - may be useful (try a google search referencing this site)

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PostPost by: gino1 » Tue Jun 26, 2018 3:18 pm

Hi,
I've always used sound deadening material with a lead lining in it as it is the best.
I've attached a link of the stuff i've used...it is mainly used in construction but underneath the roof lining no one would notice.
I'm sure there's something similar in the UK ....

http://www.edilportale.com/prodotti/tro ... _4004.html

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PostPost by: mbell » Tue Jun 26, 2018 6:25 pm

I'd likely just use foiled backed (radiant barrier) general automotive insulation, the stuff designed to go under carpets. Should provide decent insulation and heat barrier while being light and cheap.
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
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PostPost by: LaikaTheDog » Tue Jun 26, 2018 8:28 pm

I used sound deadening spray in my boot. Made a nice finish but didn't do much.

I put a lightweight sound deadening Hessian between the ribs on my plus 2 roof and it made a massive difference!

You must use the high temp engine bay spray adhesive as the roof gets very warm in the sun and you don't want your Hessian to droop...
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PostPost by: vincereynard » Fri Jun 29, 2018 8:45 am

LaikaTheDog wrote:I put a lightweight sound deadening Hessian between the ribs on my plus 2 roof and it made a massive difference!


Although it wasn't on a +2 I imagine the principle is the same. Perhaps the roof panels act like a drum skin in certain circumstances?
Whilst rebuilding an Olympic Phase 2 I stiffened the roof by using paper rope, "glassed" across the diagonals. Thin insulation pads stuck into the resultant triangles. That strange old thing was remarkably quiet.
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PostPost by: wotsisname » Fri Jun 29, 2018 10:31 am

I've used the lightweight dynamat under the roof, on the boot floor, around the suspension towers, behind the dash and will put a sheet inside each door. I put the usual sound deadening in everywhere else (ie where originally fitted) . Unfortunately I can't yet say if it works as I've yet to drive my +2. My aim is to have a vehicle that is more pleasant on longer drives, I remember it being a bit noisy when it was on the road years ago, but little of the carpet and soundproofing in the front of the car was in good condition.The headlining was also badly torn, but I think much of the noise was from the roof .
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PostPost by: mikealdren » Fri Jun 29, 2018 12:21 pm

For sound deadening, there are different materials for different jobs. To stop panel noises (e.g. the roof), stick on damping pads are probably best, for barrier materials, traditional felt is ok, heavier materials are better, e.g. felt with a rubber backing or dynamat etc. I haven't tried the paint type barriers; although they may well be very good they are expensive and need to be applied quite thickly.

For panel damping, fit isn't too important, for barriers, you need a complete barrier - gaps let the noise through.

Lightweight under carpet materials probably won't provide much of a sound barrier to the likes of engine or road noise.

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PostPost by: Bigbaldybloke » Thu Jul 05, 2018 9:55 pm

I?ve fitted the Dodo mat on the floor panels and part of the central tunnel, it comes in a4 sized sheets and was straightforward to fit and should stop these flat panels resonating. I?ll still fit the standard sound deadening carpet underlay as well.

I?m not sure about fitting the Dodo mat to the roof lining as the adhesive on them is good but not sure how it will perform on the roof when it gets hot in the sunshine. Might do some more research on other materials and use the adhesive Rohan recommended for under bonnet insulation.

Photo attached.
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