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Author Topic: Insulating a Class B RV  (Read 538 times)


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Insulating a Class B RV
« on: January 21, 2018, 09:50:59 PM »
Anyone ever undertake removing the wall panels in an older used factory class B RV such as a roadtrek etc. and putting in better insulation? was just wondering if anyone had any experience with this and if it is very difficult or even advisable

Rene T

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Re: Insulating a Class B RV
« Reply #1 on: January 22, 2018, 07:34:31 AM »
I've never done this and don't have a clue on what's the best way to insulate. I was just thinking. How would it be with spray foam. You may be able to prep it for spray foam and might be able to get a good deal with a spray foam company because you could probably drive it to a job site where the insulating company is already set up doing a house or business. It would only take a few minutes to do a small van. Just a thought.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

Gary RV_Wizard

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Re: Insulating a Class B RV
« Reply #2 on: January 22, 2018, 09:05:36 AM »
I've not done it nor heard of anyone who has, but it seems to me the base problem is lack of space for insulation.  You aren't going to get much gain in R-factor using a different material if the available wall space is only 1.0" (which I think is likely). Another limitation is conduction through structural members (no insulation) and single pane windows.  The roof probably needs to be addressed as well.

This article discusses insulation for a tiny house where the construction limitations are probably similar. It describes some insulation types that might exceed the typical R3 per inch. You might also make some gains simply by better workmanship, i.e. fitting the insulation better so there are fewer gaps.

Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL


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Re: Insulating a Class B RV
« Reply #3 on: January 22, 2018, 12:51:33 PM »
You may also run into condensation issues
2002 Safari Trek 2830


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Re: Insulating a Class B RV
« Reply #4 on: January 22, 2018, 02:15:37 PM »
The best insulation (IMO) is called polyiso foam.  It has an R value of 7 per inch particularly in the summer time.  In the wintertime all foam insulation loses some effectiveness but polyiso is the worst of the lot.  If you can air-gap it and not allow it to touch either the inner or outer wall, you pick up another +1 R because it is foil lined.  Radiating back out the summer heat seems like the greatest value to most campers.  I suggest you keep your spray foam usage to a minimum.  I think no matter what type (open cell/closed cell/all the other cells) of foam you use, it gets moisture between the insulation and the outer surface.  That's a huge problem in a steel vehicle like I am in, maybe less of an issue in an aluminum RV such as y'alls. 

Just like a house, inside the insulation you should use a poly film as vapor barrier.  Unless your camper is wooden framed I would likely attach the poly with double stick tape on the studs.  You just have to hold it until you get the inner walls installed.

I am a "go for it" guy.  You can't ask someone like me if it is worth it.  I will always say yes.  :-)

Blogging my Stealth Camper build.  Check out the whole project at http://livingonthestealth.blogspot.com


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Re: Insulating a Class B RV
« Reply #5 on: February 21, 2018, 08:01:43 AM »
Thanks for all the responses!  :)