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Old 08-05-2017, 09:01 PM   #1
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Best insulation for motorhome

I know a lot of people are against the spray foam, it used to come apart into a powder. Newer stuff with different formulas is supposed to be fine and I know we used it in Afghanistan with some amazing results. That said, if cost/time was no issue what would you do for insulation? Once my engine conversion is done and the rv is inspected and legal to drive. I'm probably going to pull everything out, do floors, update wiring, and insulation. I'd like to do the best job possible. I live in Houston, TX and plan on doing most of my camping during the summer as I am a science teacher and I get those off every year. That said I want some good insulation .

I'm also thinking about buying some more por15 or that roof paint/insulation and maybe painting the inside of the walls before I start to help prevent any trapped moisture from eating up the aluminum and sealing up any possible gaps. I get a pretty amazing deal on paint that is just about to expire from a buddy of mine.
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Old 08-05-2017, 09:33 PM   #2
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Originally Posted by Jjona5 View Post
That said, if cost/time was no issue what would you do for insulation? Once my engine conversion is done and the rv is inspected and legal to drive. I'm probably going to pull everything out, do floors, update wiring, and insulation. I'd like to do the best job possible. I live in Houston, TX and plan on doing most of my camping during the summer as I am a science teacher and I get those off every year. That said I want some good insulation .
Engine/generator compartment - composite insulation made up of a thick vinyl pad covered in egg-crate foam for noise insulation as well as heat insulation to prevent heat transfer into living spaces. Something like this:
https://www.fisheriessupply.com/soun...rier-composite

Floor - More sound deadening, to cut road noise:
https://www.fisheriessupply.com/3m-0...ning-pad-38543
with a 3-layer wood/polyurethane-or-polyethylene/wood composite sandwich flooring over the sound deadening pads for heat insulation.

Walls and roof - Polyethylene foam (same stuff that is the core material in Prodex, but without the foil on both sides, which you may not need) You can get the un-backed foam thicker than you can the Prodex brand. And if you need a vapor barrier, it's easy to add one separately. Get the polyethylene foam insulation in rolls, not rigid panels.

Windows - 3M Crystalline automotive film to minimize heat gain/loss through windows.
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