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Old 04-22-2018, 12:02 PM   #1
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Spray foam vs Foam board

I know some of the pros and cons of using different insulation (cost, time) but what other differences are there?
Are the R-values much different?
What about moisture?
Radiant barriers?

I like the idea of spray foam. It seals holes. But what about "off gassing?"

Any knowledge and experience would be greatly appreciated.
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Old 04-22-2018, 01:19 PM   #2
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We decided to remove all Glass wool from the bus and replaced it with PIR-isolation plates, we used spray-foam (isolation PUR) to fill the unreachable areas and small spaces between/around the plates.

Our PIR-plates (50mm) have an Rd value of 2.72 ~ 2.32.

The isolation / Rd value of PUR (spray foam) is a little less. but still very good!

We discovered that if you process the PUR / SprayFoam in an hot environment (during a hot day) that huge air bubbles can appear within your isolation so keep the weater / temperature in mind!
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Old 04-22-2018, 01:39 PM   #3
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Quote:
Originally Posted by KasperNL View Post
We decided to remove all Glass wool from the bus and replaced it with PIR-isolation plates, we used spray-foam (isolation PUR) to fill the unreachable areas and small spaces between/around the plates.

Our PIR-plates (50mm) have an Rd value of 2.72 ~ 2.32.

The isolation / Rd value of PUR (spray foam) is a little less. but still very good!

We discovered that if you process the PUR / SprayFoam in an hot environment (during a hot day) that huge air bubbles can appear within your isolation so keep the weater / temperature in mind!
Thanks for the tip!
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Old 04-22-2018, 03:03 PM   #4
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That foam sealant is not the foam to use.

Closed Cell Spray Foam has an R-Value of about 6 per inch depending on weight.

It seals, and insulates very well, and is the insulation of choice.

The downside is that it costs at least double the price of foam board that insulates almost as well but is a little trickier to seal.
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Old 04-22-2018, 03:39 PM   #5
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That foam sealant is not the foam to use.

Closed Cell Spray Foam has an R-Value of about 6 per inch depending on weight.

It seals, and insulates very well, and is the insulation of choice.

The downside is that it costs at least double the price of foam board that insulates almost as well but is a little trickier to seal.
I think spending the extra money on insulation is well worth it, to install the best product.
Any negatives, though? Are there fumes being given off forever? Does it handle humid environments well? Does it mold?
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Old 04-22-2018, 03:59 PM   #6
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Originally Posted by Life And Stuff View Post
I think spending the extra money on insulation is well worth it, to install the best product.
Any negatives, though? Are there fumes being given off forever? Does it handle humid environments well? Does it mold?
I had my first bus spray foamed.

For a few weeks after having it sprayed you could smell a distinct odor from the foam. Especially in hot weather. By the time I moved in the smell was pretty much gone.

I lived full time for 6+ years covering 40+ states and never had any moisture or mold issues with the insulation.
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Old 04-22-2018, 03:59 PM   #7
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Originally Posted by Life And Stuff View Post
I think spending the extra money on insulation is well worth it, to install the best product.
Any negatives, though? Are there fumes being given off forever? Does it handle humid environments well? Does it mold?
It's closed-cell and remains dry.

It has no issues with damp or mold.

The whole "off-gassing" thing is over-blown. A few sensitive folk might smell something when it's first installed. There are no known cases of the smell remaining beyond a few days, or of anyone becoming ill because of it.

They spray entire houses and commercial buildings with the stuff. If there were any real issues we would know by now.

I can't afford it. If I could, I'd use it. What I am most likely to do is use foam board for all the flat surfaces and ceiling, and buy a small kit for the end caps.
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Old 04-22-2018, 04:02 PM   #8
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It's closed-cell and remains dry.

It has no issues with damp or mold.

The whole "off-gassing" thing is over-blown. A few sensitive folk might smell something when it's first installed. There are no known cases of the smell remaining beyond a few days, or of anyone becoming ill because of it.

They spray entire houses and commercial buildings with the stuff. If there were any real issues we would know by now.

I can't afford it. If I could, I'd use it. What I am most likely to do is use foam board for all the flat surfaces and ceiling, and buy a small kit for the end caps.
Awesome. Thanks.
I'm overly paranoid with the whole formaldehyde thing. And mold.
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Old 04-22-2018, 04:02 PM   #9
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I had my first bus spray foamed.

For a few weeks after having it sprayed you could smell a distinct odor from the foam. Especially in hot weather. By the time I moved in the smell was pretty much gone.

I lived full time for 6+ years covering 40+ states and never had any moisture or mold issues with the insulation.
Terrific to hear! Thanks
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Old 04-22-2018, 05:04 PM   #10
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There is a very nasty video out there of how fast spray foam ignites and how quickly fire spreads (it was in a simulated home environment), and the thick black smoke that it gives off if it ever catches fire is frightening.

For that reason, I would stick to fire resistant closed cell spray foam. Or some of the companies use a "Intumescent" paint like coating over the top that is some very cool chemical magic that makes it significantly more fire resistant.
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