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Old 12-06-2019, 09:59 PM   #1
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How Much Spray Foam

I'm building my bus for winter camping in what could be extreme cold (-20'F at night). I'm planning on 2 in xps board on the floor and 2 inches of spray foam on the walls and ceiling. The windows will have 2 inch foam board covers for when it is really cold. This should give me about an r-12 all the way around. The front of the bus (windshield, entry door ect.) will be separated and insulated from the living area. I plan on using a 10kw (34,000 btu/hr) espar diesel coolant heater as a heat source. Is this enough insulation to be able to practically heat the bus in these condition? I could go thicker at the expense of headroom and floorspace.

To those of you with foam insulation that have stayed in cold climates how thick is your insulation on walls, ceiling and floors? How easy was it too heat the bus at the coldest outside temps encountered? What did you use to heat your bus and how many BTUs? Also how well were your windows insulated?

Thanks

Ted
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Old 12-06-2019, 10:13 PM   #2
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Originally Posted by TJones View Post
I'm planning on 2 in xps board on the floor and 2 inches of spray foam on the walls and ceiling. The windows will have 2 inch foam board covers for when it is really cold. This should give me about an r-12 all the way around.
Rinflation.

Everything you're doing with insulation sounds solid and effective. Only other thing you could do is add even thicker insulation, and you can't do that without losing height and width in your living space.
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Old 12-07-2019, 03:25 PM   #3
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boondock camping or powered sites?

If long-term in ski area parking lots I'd want 3" minimum,

Alaskan winters at least 4"

and very well sealed, remove/cover most windows.

Milder conditions maybe 2" would be OK
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Old 12-22-2019, 10:05 PM   #4
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Join Date: Jul 2017
Location: Rapid City, SD
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Year: 2001
Coachwork: Blue Bird
Chassis: CS RE
Engine: ISC 8.3 L 260 hp
Rated Cap: 36
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Originally Posted by john61ct View Post
boondock camping or powered sites?

If long-term in ski area parking lots I'd want 3" minimum,

Alaskan winters at least 4"

and very well sealed, remove/cover most windows.

Milder conditions maybe 2" would be OK
3 inches sounds like a better idea than 2.

Thanks

Ted
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