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Old 07-18-2012, 05:56 PM   #11
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Well I've made a couple trips now and the noise level inside the motorhome at the drivers seat went from 73db down to 66db on the same stretch of road at the same speed, both measurements taken on a calm day so little wind. I pretty good improvement since every 3db you drop cuts the sound level in half. My daughter and I can now talk without shouting and I can listen to my audiobooks without noise canceling headphones.

The bad new is that shorts after taking the mesurments the 3m glue started to fail. So all of the gray sound proofing I put up has come off unless it was screwed in. The silver backed stuff is still installed, it's built in glue is holding fast. I haven't measured the sound again since that happened but it's louder again.

On the doghouse I used construction adhesive and that's still holding. I'll have to figure out another plan and try to put the gray stuff back in again. Frustrating but at least it all fell off after I parked and not on the road.
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Old 07-18-2012, 09:22 PM   #12
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Great information.
I also read you add a second layer of the silver stuff on top of the first layer.
That may be the best way without additional adhesives.
I'm going to see if I can buy a similiar product from USA.
I think Dynamat has something like it.
Anyone else planning to try this?
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Old 07-18-2012, 11:30 PM   #13
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Seriously ? man i'm glad my 378 isn't noisy
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Old 07-19-2012, 12:55 AM   #14
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Seriously ? man i'm glad my 378 isn't noisy
My 378 isn't noisy as others have expressed not being able to talk to anyone in the passengers seat. But I'm sure if it was quieter it would be better. I'm always keeping my avenues open.
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Old 07-19-2012, 07:57 AM   #15
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I can't imagine,we have no hearing each other problems.. in the early 70's we'd spray that insulation under the cabs of our road trucks, i.e. peterbilts but mainly to help keep the cab,stay warm in winter, problem is, when you have a problem under there an you will, now you have to start tearing it down to find it ... its a righteous effort i guess,just don't think its worth it, think we got ours sold,then off to a diesel an that will be that...
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Old 07-25-2012, 10:12 AM   #16
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You will notice a differance right away.It will make you more restful on a long trip,it did me,I couldn't believe it at first.All the hard work will pay off.
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Old 10-06-2012, 07:42 PM   #17
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You will notice a differance right away.It will make you more restful on a long trip,it did me,I couldn't believe it at first.All the hard work will pay off.
Are you still happy?
Is everything still holding up?
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Old 12-28-2014, 09:04 PM   #18
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Sound from around steps

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I don't know yet. But once I get it all finished and take it for a drive I'll post the data.

I plan to cover the under side of the steps also. I'll bet a lot of noise comes up through there. And if I don't get the steps in place just right I can see daylight through there. So, like you said, it's no good at keeping the cold out either.
I have added sound reduction material around the steps ....and I believe it helped some, did the same to the dog house. I am interested if adding to the wheel welds Will help
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Old 12-28-2014, 09:33 PM   #19
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I tip my hat to ya bro. This is a big under taking. Did you give consideration to doing the floor on the inside? Like maybe lifting the carpet?
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Old 12-28-2014, 09:58 PM   #20
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I have added sound reduction material around the steps ....and I believe it helped some, did the same to the dog house. I am interested if adding to the wheel welds Will help
Putting insolation around the steps is very easy just take the step plate out and glue and tape the material to the back
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