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Old 05-15-2012, 04:56 AM   #1
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Insulation

Anyone ever replaced the insulation in the engine or generator bay, if so what product did you use?
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Old 05-15-2012, 06:23 AM   #2
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Good idea as it is where all the cold comes in. There are products available in the hot rod world, to insulate hoods etc. The problem is you would need to put it on the outside or inside firewall to be effective. That would be some chore as all the wires and stuff are already attached. IF you did manage to work around all that stuff, you still would have that big glass windshield that lets cold or hot air in. An awful lot of work with not much benefit.
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Old 05-15-2012, 10:48 AM   #3
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I need to clairfy my issue. The insulation in my generator and engine compartment is deteriorating (falling apart) from age and heat. Yes it will mean removing the generator and a complete rebuild of that compartment exhaust, fuel lines and so on, as well as the engine bay. I'm sure I can get the material from Foretravel, however shipping on 4x8 sheets from Texas would kill ya. Just wondering if anyone found anything avaliable at the local level.
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Old 05-15-2012, 11:02 AM   #4
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Try an auto parts store - they usually carry underhood insulation, which is fire and oil resistant. Here is Autozone's product

Fiberglass Hood Insulation | AutoZone.com
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Old 05-15-2012, 01:27 PM   #5
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I just did the firewall in my jeep. I have not tested it yet. I used a heat blocking paint which I mixed myself. The secret is in the insulating micro ceramic beads. They are hollow on the inside and the space is a vacuum. For the paint I used a paint on bed liner material found in most automotive parts stores. You mix one part ceramic beads to 4 parts paint in a larger container then either brush or roll on the product. You can also get the product as an automotive insulating paint from the manufacturer. You are going for a 20 mil thickness, I used 4 coats. HY-Tech is the manufacturer. They make products for RV's.
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Old 05-15-2012, 07:27 PM   #6
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Originally Posted by Gary RVRoamer View Post
Try an auto parts store - they usually carry underhood insulation, which is fire and oil resistant. Here is Autozone's product

Fiberglass Hood Insulation | AutoZone.com
Thanks Gary
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Old 05-15-2012, 08:14 PM   #7
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Bruce is your current material fiberglass and is it molded to shape. Most car hood liners today are molded from fiberglass and trying to get a molded shape for your coach may be impossible unless Foretravel has them.

If it is a flexible fiberglass then you can try to find a distributor of air conditioning and heating products. You probably want to try and find Duct Liner insulation. The fiberglass duct liners have a coating and/or facing on one side to make them more abuse resistant.

You can also obtain adhesive used to attach the insulation to the inside of metal ducts. I would also try to use large washers and screws to further secure the insulation and to hold the insulation in place until the adhesive set.

If you can't find a distributor of the insulation, see if you can find a large sheet metal duct shop that does commercial duct work as they will be using the material and would probably sell you a roll as well as adhesive.

I believe the insulation comes in 1/2, 1, 1-1/2, and 2 inch thickness. You can check the websites of Owens Corning, Knauf, Certainteed, or Johns Manville for the duct liner products they make. Just Google the company name and add duct liner to that.
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Old 05-16-2012, 06:10 AM   #8
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The same suppliers can have mineral wool or rock wool products. The r value is only a little less than fiberglass and also provides heat and fire resistance. It generally comes in faced sheets.
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