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#2701283 - 07/31/12 09:30 PM Basic soundproofing. I need some input
Klutch9 Offline


Registered: 01/07/09
Posts: 2453
Loc: Rochester, MI, US, World
For awhile I've been considering adding some soundproofing to my Focus. I've read a lot online about people using roofing membrane material as sound deadening, as it is similar to a lot of 'professional' sound deadening products. What I really want to know is: how much do I really need to apply?

I've heard that even a 1' x 1' square applied to a panel can make a HUGE difference in absorbing vibration and some sound. Is this true? If so, I can easily apply a little sound deadening to each panel on the car (doors, trunk, etc).
_________________________
'11 Fusion SE 2.5L - 75k miles - Havoline ProDS 5w20, FL-910s
'08 Sedona LX LWB 3.8L - 117k miles - Peak conv. 5w30, XG9999

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#2701295 - 07/31/12 09:39 PM Re: Basic soundproofing. I need some input [Re: Klutch9]
dparm Offline


Registered: 04/19/10
Posts: 13466
Loc: Chicago, IL
Without knowing the precise location the sound is originating from, you're better off applying as much as possible. Doors, floors, ceiling, etc. I have seen some people go nuts and gut the entire interior.

It comes down to "mass". The thicker and heavier stuff deadens the sound better. So yes, a single 12"x12" square can provide some relief, depending on the type of noise you have making its way into the cabin.


Edited by dparm (07/31/12 09:54 PM)
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#2701309 - 07/31/12 09:55 PM Re: Basic soundproofing. I need some input [Re: Klutch9]
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
Yes, just doing the middle of the panel as best you can is usually enough. Doing up to the edges does not help as much because what the sound deadening does is prevent ringing of the metal. The edges are not going to ring because they are pretty stiff. Its the middle of the panel that is going to do it.
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2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
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#2701340 - 07/31/12 10:15 PM Re: Basic soundproofing. I need some input [Re: Klutch9]
LeakySeals Offline


Registered: 02/18/11
Posts: 6578
Loc: Hudson, NH
I use this stuff with a sticky back. Put it everywhere. Rip the rugs and seats out, put it down, put the rugs and seats back, what a difference. Seems to help with heat and the cold too. stick it to the inside of the door panels. under your speakers to direct sound, etc. ebay has it cheaper

http://www.eastwood.com/eastwood-thermocoustic-material.html
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#2701460 - 08/01/12 01:19 AM Re: Basic soundproofing. I need some input [Re: Klutch9]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
Are you atteuating a loud sound system?
Are you quieting the car from out side noise?
These require different approaches and materials.
Cheap jute carpet underlayment with duct tape and construction glue works well for ambient noise reduction.

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#2701600 - 08/01/12 08:32 AM Re: Basic soundproofing. I need some input [Re: mechtech2]
Klutch9 Offline


Registered: 01/07/09
Posts: 2453
Loc: Rochester, MI, US, World
Originally Posted By: mechtech2
Are you atteuating a loud sound system?
Are you quieting the car from out side noise?
These require different approaches and materials.
Cheap jute carpet underlayment with duct tape and construction glue works well for ambient noise reduction.


Yes, I am trying to quiet some of the ambient/road noise.
_________________________
'11 Fusion SE 2.5L - 75k miles - Havoline ProDS 5w20, FL-910s
'08 Sedona LX LWB 3.8L - 117k miles - Peak conv. 5w30, XG9999

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#2701723 - 08/01/12 10:30 AM Re: Basic soundproofing. I need some input [Re: mechtech2]
jhMalibu Offline


Registered: 04/05/07
Posts: 206
Loc: Boston, MA
Originally Posted By: mechtech2

Cheap jute carpet underlayment with duct tape and construction glue works well for ambient noise reduction.


I did this on my 09 Ranger on the door panels. Made a big (enough for me) difference without costing stupid money. I didn't break any of the plastic seals on the door so shouldn't be a moisture problem.

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#2701725 - 08/01/12 10:35 AM Re: Basic soundproofing. I need some input [Re: Klutch9]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18958
Loc: Sunny Florida
Yes, it can make a HUGE difference.

Some of it is heavy, but there are a lot of choices now. I have used this in several cars and trucks and the difference is well worth the effort.
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#2702083 - 08/01/12 04:54 PM Re: Basic soundproofing. I need some input [Re: SteveSRT8]
mgm13 Offline


Registered: 11/24/03
Posts: 264
Loc: Rio Grande Valley
I used "FatMat",bought a bulk pack 50 sq ft & put it down.Self adhesive and you must roll it down tight.I did everything but the headliner. A huge improvement-worth the cost and effort.
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#2702106 - 08/01/12 05:13 PM Re: Basic soundproofing. I need some input [Re: Klutch9]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
I did my headliner, doors, floor [under the carpet] and trunk area with carpet underlayment and also some extra in spots of the high density under hardwood foor insulation.
A couple of hours and the car was MUCH nicer.
My ZX2 needed it more than a Crown Vic, though.

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#2702798 - 08/02/12 12:16 PM Re: Basic soundproofing. I need some input [Re: jhMalibu]
Klutch9 Offline


Registered: 01/07/09
Posts: 2453
Loc: Rochester, MI, US, World
Originally Posted By: jhMalibu
Originally Posted By: mechtech2

Cheap jute carpet underlayment with duct tape and construction glue works well for ambient noise reduction.


I did this on my 09 Ranger on the door panels. Made a big (enough for me) difference without costing stupid money. I didn't break any of the plastic seals on the door so shouldn't be a moisture problem.


Just curious... Did you put the jute on the plastic door skin, or on the metal inside of the door? I could easily pull all of the door skins off and put a layer of jute on them, without even touching the plastic/moisture seals. Doing it this way wouldn't really dampen door vibrations, but it WOULD block sound I'd think.
_________________________
'11 Fusion SE 2.5L - 75k miles - Havoline ProDS 5w20, FL-910s
'08 Sedona LX LWB 3.8L - 117k miles - Peak conv. 5w30, XG9999

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#2703032 - 08/02/12 04:07 PM Re: Basic soundproofing. I need some input [Re: Klutch9]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
Outside of the plastic is the same as inside, for noise attenuation.
If the door panel fits back on, it will work great. Why disturb the plastic if you don't have to?

You can also spray bedliner - any heavy coating - on the inside of the doors [under the plastic on the inside door skin]. Make sure the drains are free afterwards!
Don't plug the drains!
Don't use stinky stuff - it'll take forever to go away!


Edited by mechtech2 (08/02/12 04:08 PM)

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#2706138 - 08/05/12 10:58 PM Re: Basic soundproofing. I need some input [Re: mechtech2]
Klutch9 Offline


Registered: 01/07/09
Posts: 2453
Loc: Rochester, MI, US, World
I have decided on what I'm going to do. After some careful listening while driving, it seems that a good majority of the road noise comes from the trunk area. So I'm going to deaden that first, using 'Quick Roof' from Home Depot (same as Peel & Seal from Lowe's). I'm going to do literally every surface in the trunk: floor, spare tire well, sides, trunk lid, and rear deck. I'm picking up the supplies tomorrow morning and will probably have it applied before the end of the work week, but it'll depend on my schedule. If all goes well and I notice some positive results, I'll move on to doing the doors also.

Part of me feels that it's not worth it... it's just a Ford Focus. But the other part of me feels that for a few bucks, why not give it a shot? After all, I plan on driving this car until it dies, so why not make it 'user-friendly'? The '08-'11 Foci (basically the same car, just facelifted) is much quieter, thanks to better sound deadening. Hopefully I can find a way to put my '07 somewhat on par with its newer siblings.
_________________________
'11 Fusion SE 2.5L - 75k miles - Havoline ProDS 5w20, FL-910s
'08 Sedona LX LWB 3.8L - 117k miles - Peak conv. 5w30, XG9999

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#2706925 - 08/06/12 06:13 PM Re: Basic soundproofing. I need some input [Re: mechtech2]
razel Offline


Registered: 06/28/03
Posts: 486
Loc: Los Angeles, CA
I have tried and use undercarpet padding, dynamat knockoff and neoprene sheets. I recommend dynamat for large flat metallic areas, but the most muffling and quietest effect I got from neoprene sheets to replace the vapor wrap found in doors and undercarpet padding above the wheel wells in the trunk.

Neoprene sheets in various thickness can be bought cheap off ebay and carpet padding super cheap at your local Home Depot or Lowes.


Edited by razel (08/06/12 06:14 PM)

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#2707459 - 08/07/12 09:24 AM Re: Basic soundproofing. I need some input [Re: Klutch9]
Whimsey Offline


Registered: 12/22/02
Posts: 4049
Loc: The Garden State
My 1996 Contour has lots of "road noise" emanating from the trunk. I know it's from the trunk because when we go on vacation and the wife packs enough luggage for 2 months for a 10 day vacation it's real quiet, she's not though grin2.

Whimsey

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