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11-10-2017, 07:58 PM
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#1
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Junior Member
State: Arizona
Posts: 23
THOR #9982
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sound deadening
I have been following posts for dampening sound in doghouse using Dynamat or Fatmat, both of which I find expensive. In Lowes today looking at foil backed 3/4 inch rigid foam insulation and a 4x8 sheet is under $10. So question is has anyone used this product to dampen sound and if so any particular installation tricks?
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11-10-2017, 08:08 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Thor Vegas 25.2
State: Indiana
Posts: 301
THOR #7993
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Doesn't sound very "bendy".
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11-10-2017, 08:12 PM
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#3
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Junior Member
State: Arizona
Posts: 23
THOR #9982
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I know it doesn't sound flexible but looking at doghouse from cabin, it looks pretty angular and wondering about cut to fit.
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11-10-2017, 08:17 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 27K
State: California
Posts: 623
THOR #2544
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Don't look at just the price. You may be making a long term investment. Also, you need something non-flammable and that can handle temps of probably 200 degrees or more. I can't decide between Fatmat or Dynamat. Fatmat is less expensive but most everybody on the forum are using Dynamat.
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This post is opinion based on experience.
2015 Hurricane 27K
2013 Sea Ray 220SD
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11-10-2017, 08:19 PM
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#5
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Junior Member
State: Arizona
Posts: 23
THOR #9982
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Flammability an issue but put foil face towards heat? How flammable is Dynamat or Fatmat? Thanks this keeps me thinking
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11-10-2017, 08:20 PM
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#6
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Site Team
Brand: Thor Motor Coach
Model: Axis 24.1 Windjammer
State: Illinois
Posts: 1,179
THOR #7074
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I did sound / heat proof ours with the Dynamat self stick product. IMO I do not think the hard foam is a good idea. I'm not saying it couldn't be done. But the adhesion, forgiveness and final outcome in the Dyanmat or like product makes for a Factory Installation & Worth the $$$.. I used my extra outside above wheels trying to "cool the floor" where my feet rest while" driving.
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Rev. Jeffrey 2017 Thor Axis 24.1 E450 Windjammer.
Silver Safe-T-Plus Steering Control
SSF-106-40 SumoSprings Solo Front Bump Stop SSR-107-47 SumoSprings Rear Bump Stop
Hellwig 7718 Front Sway Bar & 7180 Rear Sway Bar
Koni FSD Front Shocks 8805-1042 / Koni FSD Rear Shocks 8805-1043
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11-10-2017, 08:29 PM
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#7
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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I found the perfect solution to this:
Fifty years ago; I started listening to Hard Rock 'n Roll music... at full volume!
Nothing is too loud anymore, but some things are a bit too quiet...
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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11-11-2017, 01:04 AM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.2
State: Oregon
Posts: 272
THOR #6934
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I went the fatmat route and am pleased. There are many areas that a ridged panel will not be able to cover, and then how do you attach it. Fatmat and Dynamat are flexible and will give if necessary.
We recently returned from a 3500 mile trip and we often commented our Vegas now sounds just like row 8 in an airbus A319. It just purrs along.......
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11-11-2017, 06:03 PM
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#9
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Junior Member
State: Arizona
Posts: 23
THOR #9982
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So in looking at Dynamat Extreme it is .067 inches thick and one person put Hoodliner (1mm thick)on top of Extreme.
Looking at Fatmat it is 3/4 inch thick so would I get better sound dampening with thicker material or am I missing something here?
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11-11-2017, 06:50 PM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,692
THOR #5196
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11-11-2017, 08:18 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 25.2
State: Oregon
Posts: 272
THOR #6934
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The fatmat I used is about 8 mil thick. It works .
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11-12-2017, 05:05 AM
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#12
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Senior Member
State: Alaska
Posts: 295
THOR #8813
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Quote:
Originally Posted by brewpa
I have been following posts for dampening sound in doghouse using Dynamat or Fatmat, both of which I find expensive. In Lowes today looking at foil backed 3/4 inch rigid foam insulation and a 4x8 sheet is under $10. So question is has anyone used this product to dampen sound and if so any particular installation tricks?
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It’s expensive because it is a good product and easy to apply. Why cut corners to save a few dollars when you know it works.
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11-12-2017, 12:56 PM
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#13
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Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: North Carolina
Posts: 54
THOR #8306
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Recently got 2 rolls of foil in A/C - Heat Dept @ Lowe's. Self stick, about 1/8" thick. Also roll of Aluminum tape. Did Doghouse and under hood. Works well, IMHO
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11-12-2017, 04:44 PM
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#14
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Member
Brand: Still Looking
State: Michigan
Posts: 87
THOR #3954
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Quote:
Originally Posted by SuperD
I used the Hoodliner and Extreme both, as recommended by DynaMat. First layer was the Hoodliner with seams sealed by DynaMat tape, then Extreme, again sealed with tape. Big reduction in noise, NO heat at all from the doghouse now. DynaMat is a little more expensive but you get what you pay for! Would do it again.
Attachment 7726
Attachment 7727
Attachment 7728
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SuperD, I’ve read the Dynamat damps down vibrations coming through the housing, while the hoodliner insulates to block heat and sound.
So it would seem best to apply the dynamat directly to the housing inside, then cover with the hoodliner.
Am I missing something here?
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11-12-2017, 06:04 PM
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#15
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Senior Member
State: Alaska
Posts: 295
THOR #8813
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Quote:
Originally Posted by Finch1408
Recently got 2 rolls of foil in A/C - Heat Dept @ Lowe's. Self stick, about 1/8" thick. Also roll of Aluminum tape. Did Doghouse and under hood. Works well, IMHO Attachment 7737Attachment 7738
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I am sure it helps with heat but what about sound?
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11-12-2017, 06:30 PM
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#16
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,692
THOR #5196
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I just did it the way DynaMat recommended, maybe I did it backwards but it works. There is a lot less noise.
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11-12-2017, 08:15 PM
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#17
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Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: North Carolina
Posts: 54
THOR #8306
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Quote:
Originally Posted by carlgorski
I am sure it helps with heat but what about sound?
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Yes. I downloaded decibel meter app to my phone and measured sound at driver seat while reving engine to 1,500 rpm before and after. I think the difference (improvement) was worth the minimal cost of material. Haven't been on open road yet though. We'll see. Worst cases scenario, I add another layer. Good luck.
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11-12-2017, 09:21 PM
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#18
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,692
THOR #5196
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Insulating the doghouse stops heat and makes a reduction in noise, mostly while cruising on the highway. There is still a lot of noise from the floor and dash area. I think adding insulation under the floor of the drivers area would help a great deal but haven’t gotten to that yet.
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11-12-2017, 11:29 PM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: Windsport
State: Florida
Posts: 746
THOR #3918
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Quote:
Originally Posted by SuperD
Insulating the doghouse stops heat and makes a reduction in noise, mostly while cruising on the highway. There is still a lot of noise from the floor and dash area. I think adding insulation under the floor of the drivers area would help a great deal but haven’t gotten to that yet.
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Just came back from a trip after installing Dynamat and was happy with the results.
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11-13-2017, 12:34 AM
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#20
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Senior Member
Brand: Thor Motor Coach
Model: ACE
State: Georgia
Posts: 214
THOR #9143
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3M 4014 SOUND AND VIBRATION DAMPING PANELS
from Aircraft Spruce & Specialty Co in Atlanta, Ga.
Great stuff for this purpose. I installed it in corp aircraft for 40 years.
I removed the heat shield material from the doghouse, installed sound damp and re-installed the heat shield. Love the outcome.
I do plan to cover the floor and other areas soon but will use the fatmat for that.
This photo is full sound damp foam before heat shield reinstalled.
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Ours is a 2018 THOR ACE 29.3
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