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Old 11-06-2008, 09:38 PM   #1
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Rigid Insulation Exposed


I just poured concrete in my crawl space and looking to get the walls insulated. Is it true that you can't use use the rigid insulation and leave it exposed? Looking to get a R-19 value.

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Old 11-07-2008, 07:39 AM   #2
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Rigid Insulation Exposed


Most rigid insulation does not have the proper fire rating to leave it exposed. Look for something that does or plan on covering it. You'd need about 4 inches of extruded polystyrene or about 2-1/2 inches of isocyanurate foam to get R-19.

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Old 11-07-2008, 08:48 AM   #3
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Rigid Insulation Exposed


Thanks. Do you have any suggestions besides unfaced fiberglass? What is the rating or terminology I need to look for and do they make rigid insulation products that will meet code?
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Old 11-07-2008, 12:52 PM   #4
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Rigid Insulation Exposed


Thermax makes a faced iso board that is rated for exposure. I've seen it used inside some metal buildings. I have no idea about cost or availability. I would look for something that says it has a UL "Class A" flame spread rating.
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