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Old 02-15-2017, 11:53 AM   #1
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Bus Inslulation

Hi there folks
I have just bought my bus and the question that I have is has anyone sprayed foam under there bus for added insulation
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Old 02-15-2017, 12:04 PM   #2
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Quote:
Originally Posted by motorhomegypsy View Post
Hi there folks
I have just bought my bus and the question that I have is has anyone sprayed foam under there bus for added insulation
There are many threads here that discuss this in one way or another. The general consensus that I have read is that it is generally not a good idea. Spray foam is not really designed for exposure like that. There could be special products out there that are, but I would suspect they are incredibly expensive.

The most typical method is to either lay down sheet foam on the steel floor of the bus, or to fur the floor up and use closed cell spray foam.
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Old 02-15-2017, 03:30 PM   #3
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Thanks for the come back
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Old 02-15-2017, 05:35 PM   #4
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Hi,

A couple of members here have done it. I bet the r value is superb, but concerns are keeping it from getting filthy and absorbing lots of moisture. Hey couldnt someone foam tue underside and then Rhino coat it to keep it sealed? Hmmm...

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Old 02-15-2017, 05:52 PM   #5
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I suppose you could spray foam the areas you wanted to insulate and then cover it over with corrugated plastic (coroplast) to keep it protected from the elements. Some RVs use a similar underbelly protection for their below decks insulation... that is, the few that actually *have* any such insulation.

In general, people seem to prefer insulating above the floor. It does leave the underside more exposed in case maintenance issues come up.
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Old 02-15-2017, 05:56 PM   #6
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I have a Bluebird that is spray foamed underneath by the factory. It is awesome. It is super quiet and cozy inside as walls are foamed 2", as well. There are no moisture problems on whatever product they used. There is no corrosion under foam on my bus, but areas that were not sprayed have some scale.

The State will scrape it off around some of the bolts when they do road inspections, but otherwise A+. Illinois vehicle.

Others chime-in with experience.
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Old 02-15-2017, 08:00 PM   #7
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What about "lizard skin"? Or as mentioned above: closed cell spray foam coated with a Berliner type material or even a quality exterior paint..

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Old 02-16-2017, 12:17 AM   #8
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There's a type of expanding foam insulation that was used on the bottom of my travel trailer. It was just used to fill in the gaps around the edges underneath. It got very wet and was exposed to everything. I don't know what kind it was though.

You could follow the same way the trailers are done, there's a sort of corrugated plastic that's screwed under the frame to enclose the underbelly. That would protect the insulation.


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