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Old 07-23-2018, 07:41 PM   #1
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Join Date: Dec 2017
Location: Dawsonville, Ga.
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Year: 1999
Coachwork: Genesis
Chassis: International
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Random Spray Vs. Rigid Insulation Thoughts

After much research I'm starting to lean away from spray foam. Spray kits run around $1/sf for 1" thick, or $1.50 for 1-1/2" thick. I was able to cut polyiso to tightly fit the curved spaces. It runs $10 for a 4' x 8' sheet or $.31/sf or $.94/sf.

The R factors are the same between the 2.

Some good info on why spray foam is not good inside "metal boxes":

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Old 07-23-2018, 08:27 PM   #2
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Location: Weeki Wachee, FL
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Year: 1997
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Rigid foam is much less expensive for sure! I'm using a little polyiso where I need something thin and flexible but mostly XPS because it's R value is stable over a range of temperatures.. Polyiso performance drops with cold temperatures.
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