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Old 03-15-2020, 08:38 AM   #1
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Has anyone used Matte R-max plus3 insulation

Just wondering if this is good for Skoolie insulation. It seems to show a better r rating than EPS or XPS
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Old 03-15-2020, 09:47 AM   #2
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Best for extreme winter is mostly polyiso but a thin skin of xps on the freezing side.
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Old 03-15-2020, 10:16 AM   #3
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Originally Posted by BusZen2003 View Post
Just wondering if this is good for Skoolie insulation. It seems to show a better r rating than EPS or XPS
I think that's the stuff I was looking into. And it needs like a 3-inch air gap to get that insulating property. They use it against the stud wall in buildings, they don't fill the cavity with it.
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Old 03-15-2020, 11:27 AM   #4
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If you're talking about Mylar based reflective barriers

that is not insulation at all, pretty much a waste of time and money in a mobile context
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Old 03-15-2020, 11:35 AM   #5
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If you're talking about Mylar based reflective barriers

that is not insulation at all, pretty much a waste of time and money in a mobile context
We aren't.
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Old 03-15-2020, 11:46 AM   #6
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OK looked it up, polyiso good stuff but forget the brand generic is fine.

Highest R-value per thickness, good stuff, but see above wrt needing a layer of XPS for extreme cold.

Would not bother with thicknesses under 2-3" total myself, but depends on context and goals.

Getting a completely well sealed vapour barrier is critical, more so than R-value.

Also eliminating thermal bridging.

Spray foam is a great tool for both in combination.
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Old 03-15-2020, 12:32 PM   #7
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Originally Posted by john61ct View Post
Best for extreme winter is mostly polyiso but a thin skin of xps on the freezing side.
Polyiso has its nominal value of R-6.5 per inch at higher temperatures; this declines at temperatures below 60F (most insulations have a declining R-value with higher temperatures, which makes polyiso fairly unique). But its low-temperature R-value is still about as good as EPS or XPS, so it's still fine for low temperatures but is best-suited for warmer weather.
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