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Old 09-18-2011, 09:58 AM   #1
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Fiberglass Insulation Under Dash

I purchased some fiberglass insulation to put under my dash to help quiet the engine noise and for heat/cold insulation. I am having second thoughts because of the possibilty of fiberglass debris getting loose inside the motor home.

Am I being paranoid or is this a reasonable caution? What would be a better material for insulation?
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Old 09-18-2011, 11:51 AM   #2
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bruceh,

I insulated mine with a "Dynamat" type product that worked very well. It sticks very well and has stayed in place for 4 years. It reduces heat and noise a lot. I bought it at Jegs or Summit speed shop but several places sell it. On the engine cover itself I used a 3/4" foam poduct with a mylar heat reflecting material.

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Old 09-18-2011, 12:08 PM   #3
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davel, thanks for the reply.

I should have mentioned that I am in the middle of a larger project and have already insulated the underside with Dynamat and some of the interior s[paces also. There are spots that are not suitable (access or too broken up a surface) for Dynamat and I am looking for something like fiberglass that comes in rolls that I can slip into the empty spaces under my dash. I have ruled out fiberglass as hazardous.
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Old 09-18-2011, 12:08 PM   #4
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I believe you will not be happy if you use the fiberglass. Dynamat is good and another to check out is Thermo-tec which comes in various configurations including a spray-on glue to attach it. I used it on theunderside of the engine doghouse in a previous coach. It made a notable difference and never came loose.
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Old 09-20-2011, 10:23 PM   #5
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Hello Davel
Thanks for the info. I'm a rookie and have a couple of questions--
1. Where exactly did you install the "dynamat" inside the coach or underneath the coach?
2. How did you attach the 3/4" foam product product to the engine cover?
3. Where can these items be purchased?
Thanks,
James
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Old 09-20-2011, 10:30 PM   #6
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fiberglass is just nasty stuff when it gets loose. Since you spent the money why not just wrap it in a plastic bag and tape the bag closed to keep the loose fibers from floating freely.
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Old 09-20-2011, 10:42 PM   #7
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James here is a thread that will help explain what you need to know.
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Old 09-21-2011, 09:37 AM   #8
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I returned the fiberglass and purchased some 3/4" closed cell foam from an industrial rubber supplier. I purchased some remnants that they had laying around for a greatly reduced price. I just slipped it into the spaces under the dash. Works quite well
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Old 09-21-2011, 08:53 PM   #9
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Hello 007
Thanks for your info. There was a lot of valuable info!! I found everything except the part about the insulation. It was worth the tour because of other helpful hints. I will keep look thru the info and I might stumble across the info.
Thanks,
James
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