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felt underlay over dynamat under carpet


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#1 jonesy

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Posted 21 February 2018 - 05:37 PM

ok lads

 

prob a silly question but do you put felt underlay under the carpet over dynamat / equivalent - i think i know the answer being 'yes' and if so how much to cover the floor area???

 

LX hatch

 

could measure but not home and want to order online ...and i know someone here will have the answer

 

and which one to choose and and experiences to share?

 

please see below

 

 

 

http://trufitauto.co...derlay-900x1600

 

http://trufitauto.co...nderlay-2-rolls

 

 

thanks in advance



#2 Cook

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Posted 22 February 2018 - 06:04 AM

I think, if you are buying the moulded carpet at the same time, most of the suppliers also sell underlay in various grades.  They would know how much you need to buy.  Cheers Ron



#3 koalasprint

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Posted 22 February 2018 - 08:41 AM

Watching with interest. I would like to know too. Eventually I plan to do this on my hatch. It's noisy around 1400rpm and with a 340KW heater up front it can get pretty hot.



#4 Ice

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Posted 22 February 2018 - 01:18 PM

Isnt the Dynamat suppose to replace the underlay my mate did his whole car with Dynamat and i mean the whole inside of the car even under the turret
but he layed his carpet straight over the Dynamat
the cheap underlay is crap

#5 jd lj

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Posted 22 February 2018 - 05:47 PM

You're still meant to use underlay of one type or another on top of Dynamat and similar products.

Check out a company called "Car Builders" for information and their range of products.

#6 Lc69

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Posted 22 February 2018 - 06:19 PM

I used Car Builders acoustic liner over the top.

#7 Cook

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Posted 22 February 2018 - 07:02 PM

I recently lined my WB ute with some cheap sound deadener and put carpet straight over the top, but this is just a daily driver and not a huge issue with noise, more wanting to try and keep the cabin a bit cooler.  One thing you will want to consider if you use both, deadener and underlay, is the overall thickness. With 10mm sound deadener and carpet I had to get longer bolts to capture the nuts for the seat rails and the console was vey tight between the tunnel and the bottom of the dash.  Cheers Ron



#8 jonesy

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Posted 22 February 2018 - 10:36 PM

thanks guys for the reply's, that site'Car Builders  ' looks good for the lining.. like the look of that acoustic stuff that goes over the dynamat type product 

 

 

but still in the same boat....how much to buy?????

 

 http://www.carbuilde...nterior-stage-2

 

i pulled the trigger on the dynamat after reading through heaps of mixed review in comparisons  maybe a bit XXXy but so is doing twice!

 

so ill probably go the dynamatt on the floor as i bought the 34sqfoot pack and use the cheaper stuff on the doors ect wanted the flooring o be the most effective as you could imagine

 

as for floor the carpet dealer i have already purchased

 

on the car builder site it looks to be 3.6sqm pack but i would hate to be short once starting the job and hate to pay for more than i needed as welll....mistakes like that add up quickly

 

looks like when i knock off shift i will be getting the measuring tape out unless some one comes through with a measurement for us

 

cheers again


Edited by jonesy, 22 February 2018 - 10:39 PM.


#9 Lc69

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Posted 23 February 2018 - 07:24 PM

I purchased 5.4m sq, and had some left over.
I also had half a sheet delaminate and didn’t use it. Looked to be a manufacturing issue.
I only did the traffic areas in my LC. So not under the rear seat, and cut outs for the front seat rails.

#10 Lc69

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Posted 23 February 2018 - 07:32 PM



Actually, I did out some under the rear seat.

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#11 jonesy

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Posted 23 February 2018 - 08:43 PM

nice job, that Carpet looks crisp

 

looks like i may have to order some more, or just face the possibility that i may not get the job done all at once...whats another week on a 10 year build

 

thanks guys

and ill try to remember to post exact sizes/ amount used for the hatch when i get around to doing it 


Edited by jonesy, 23 February 2018 - 08:43 PM.


#12 jd lj

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Posted 24 February 2018 - 06:28 AM

Actually, I did out some under the rear seat.
attachicon.gifA6E57EFA-02E9-49A5-8463-820F91F9A56E.jpeg
attachicon.gif75E15082-5B7A-445A-9981-05D308888BDE.jpeg
attachicon.gif6AFECABD-688A-4EF3-8D75-962CEB7EECC4.jpeg


How do the before and after noise levels compare?

I see that you've used the Car Builders acoustic liner for the underlay too.

What carpet supplier did you use? We're you happy with the fit? I've seen that some have the cut out for the steering column with stitching around it and others don't even have the cut out.

#13 Lc69

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Posted 24 February 2018 - 07:07 AM

I think the smaller pack might go close.
I still have some left and had to waste some because of the delamination on one sheet.
I used it for the underlay as well, it feels fine under the carpet.
I used cloth tape the hold down the edges and seams.

Haven’t used the car to know the difference, it more the thought that counts at the moment.
I didn’t go overboard as you can see.

The carpet is cheap stuff from eBay. I’m just laying something down so I can keep moving.
The fit is good. Probably be there for a few years, ha ha.
Some edges were already finished, like the steering column, some were not.
The good carpet suppliers finish the edges on request. Dash Original will put the handbrake cutout in as well.
I’m working around these issues a few different ways just so it looks reasonable.

#14 LXSLR5000

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Posted 20 July 2018 - 11:41 PM

Hi,

 

I'm at this stage as well. Did you use Dynamat and the Acoustic liner as well? It seems that the Acoustic liner may be suitable to be used by itself?

 

Cheers

Scott



#15 jonesy

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Posted 22 July 2018 - 02:48 AM

i have bought both for my build, not yet installed but feel i have made the right decision thanks to fellow forum members 



#16 Orange SS

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Posted 23 July 2018 - 04:13 PM

I have put dynamat and new underlay under new carpets in my hatch and I would recommend using both as the noise and heat has been reduced massively.

My floor mats used to melt to the floor on the passenger side due to the extractors and now with an upgraded engine too, it doesn't seem to get very hot in that spot at all.



#17 jonesy

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Posted 30 July 2018 - 10:28 PM

I have put dynamat and new underlay under new carpets in my hatch and I would recommend using both as the noise and heat has been reduced massively.

My floor mats used to melt to the floor on the passenger side due to the extractors and now with an upgraded engine too, it doesn't seem to get very hot in that spot at all.

 

 

i pulled the trigger and bought the commodore (dynamatt) and also the car builders acoustic liner 

 

thanks for all the info

 thinking i will also run with sound dead sprayed under the car topped with 2k matt black or similar as well

 

ill just put the boot into it when the missus starts nagging -prob nagging about putting the boot into it sometimes you just cant win - first world issues i suppose 

 

cheers



#18 Cook

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Posted 24 April 2019 - 12:51 PM

Hi Jonesy.  Not sure if you are up to this stage yet but how did you go with the underlay etc.  Reason I ask is I'm wondering with the deadener and underlay then adding the thickness of the carpet, is there any issues fitting all this under/tucked into things like the kick panels, scuff plates console etc.  Cheers Ron



#19 Statler

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Posted 27 April 2019 - 07:07 PM

Hot tip guys : Seats bolt to bare floors. Not to carpet, not to underlay, & not to Dynamat.

Bolt the seat down, mark 10 mm clearence around the mounts, remove the seat & cut the underfelt / Dynamat away so the seat mount bolts to the bare floor.

Then you don't need longer bolts & you don't have to spend the rest of your ownership days tightening the seat bolts back up .

I would hate to be in a wreck with loose seat bolts! :)

#20 77lx308

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Posted 27 April 2019 - 08:37 PM

Just a slightly left field suggestion.

I just put some Exhaust Insulating Wrap on the lower end of the extractors through to about the end of the centre console - the area that always seems to get warm from the 2 and half inch twin heaters.

Works a treat!! No more heat and also reduces cabin noise. Does not look exactly great but hey unless someone is under the car looking at the exhaust........






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