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Old 09-21-2018, 01:07 PM   #1
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Sound deadening in class C -- Worth it?

I'm thinking of adding some sound dampening around the cab of my Chateau (E450 chassis). For those who have done this, did it make a significant difference? Is it worth the cost and time to do it? And which areas make the most difference: doghouse, firewall, floors, doors, hood, fender wells?

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Old 09-21-2018, 01:41 PM   #2
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I'm thinking of adding some sound dampening around the cab of my Chateau (E450 chassis). For those who have done this, did it make a significant difference? Is it worth the cost and time to do it? And which areas make the most difference: doghouse, firewall, floors, doors, hood, fender wells?
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Old 09-21-2018, 01:55 PM   #3
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Attack the Doghouse first: this is probably the biggest source of noise and heat that you'll have to deal with.

Good luck! Take lots of pictures, and let us know how much of an improvement you get!
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Old 09-21-2018, 10:29 PM   #4
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Do everything (if you can). Dog house first.

I dont have a C but my Axis is very simular in many ways (E450 Ford Chassis). I did the doghouse first then the Firewall and under the dash (from the engine compartment = much diff than yours). All of them made a difference. I really have not done the fender wells much (Again very diff than yours) but I might make a plastic liner at a later date to help with noise.

IMO its worth it. I keep adding more as time goes on. I will do one improvment that will show new spots or missed spots that need insulation. I bet I added close to 50#+ of a Dynomat (asphalt type to deaden sound with thick aluminum backing) and the 3/4 inch Fat Mat (absorbs sound = rejects heat) to my RV now.

I think bests results using both types in insulation together. Both reject heat too.

IMO get the good stuff.... I tryedthe cheap stuff in the past - the adhesive dont hold over time and they are not as thick. Mine is holding strong over a year now with high outside temps and mega engine heat.
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Old 09-22-2018, 07:25 AM   #5
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Attack the Doghouse first: this is probably the biggest source of noise and heat that you'll have to deal with.



Good luck! Take lots of pictures, and let us know how much of an improvement you get!


Do it. I insulated dog house and floors and doors. Night and day difference. We can talk now.
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Old 09-24-2018, 12:23 PM   #6
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What material did you guys use for the doghouse?
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Old 09-24-2018, 01:05 PM   #7
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Dy-No-Mite!! (in your best JJ Walker voice)

Err.... Dynamat

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 09-24-2018, 10:11 PM   #8
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If I was you I would use the heavy Dynomat xtreame (or other name brands) - it was like 50 mill or 75 mill thick + the 3/4 Fat mat (or dynomat brand has one and its the thick foam with aluminum backing - self sticking). Both work great and together they will give you maxiumum sound and heat rejection. I tried some generic stuff but they are not as thick and not as sticky IMO. So do it right and do it once.
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Old 09-24-2018, 10:15 PM   #9
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"So do it right and do it once"

One of my favorite lines..."funny how no one has time to do it right but always has time to do it over".
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Old 10-01-2018, 01:19 PM   #10
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Okay, I started with the doghouse using the recommended Dynamat Hoodliner. I need to drive it to the shop tomorrow, so I'll find out then if it makes much difference. In my driveway it sounds maybe a little quieter, but it's not a huge difference.


I noticed when I had the doghouse removed, there is a mostly horizontal curved metal bulkhead/firewall between the dash and the engine, and it also has some of the factory cardboard/foil insulation on the underside of it, similar to what was inside the doghouse. It does sound to me like a lot of the engine noise is coming from the center dash area, so I'm thinking that adding some of the hoodliner material to that bulkhead might help. It's a difficult area to work in, though, and there isn't much room there.
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Old 10-01-2018, 04:18 PM   #11
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Good job. I tired to add insulation to every single area I could reach under the dash (Even double up in some areas) plus under the hood and under the RV in the cockpit area. It really help with alot with sound and eliminated ALL heat but there is only so much you can do with sound when your sitting on the engine. But I only really notice it when your going up a steep hill.
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Old 10-01-2018, 04:55 PM   #12
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Originally Posted by jabrabu View Post
Okay, I started with the doghouse using the recommended Dynamat Hoodliner. I need to drive it to the shop tomorrow, so I'll find out then if it makes much difference. In my driveway it sounds maybe a little quieter, but it's not a huge difference.
Looks good! We can't wait to hear what you're no longer hearing!
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Old 01-22-2019, 04:34 AM   #13
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Did an extremely easy/cheap sound damping. Bought a set of vent insulating pillows. Dramatically lowered the cab wind noise and we could talk. Next I plan to attack the engine compartment.
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Old 01-22-2019, 04:37 AM   #14
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Did an extremely easy/cheap sound damping. Bought a set of vent insulating pillows. Dramatically lowered the cab wind noise and we could talk. Next I plan to attack the engine compartment.
What are Vent insulating pillows?
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Old 01-22-2019, 02:20 PM   #15
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This helped quite bit....
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Old 01-22-2019, 04:07 PM   #16
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What are Vent insulating pillows?
Thats the pillows that you put in your roof vents to insulate from heat and cold. But they also help with sound.
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Old 01-22-2019, 04:10 PM   #17
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This helped quite bit....
Yep, I have put so much sound / heat insulation in my Axis, Inside, under floor, under hood, under dash... Just about anywhere you can reach.

Its helps tremendously.

Even have tired a 2nd and 3rd layers in spots (like firewall and under dash). The extra layers help some ..... but not as much as the first layer so its hard to say if its worth a 2nd layer or not for most RVers.
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