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randr

(12,559 posts)
4. R-rating for foam is generally by the inch
Thu Feb 9, 2012, 11:17 AM
Feb 2012

as thickness of walls varies. I would check the 4 factor as I have never seen a foam product, professionally applied, below a R-9 per inch. Fiber glass "batts" come sized for 4" or 6" walls and carry a rating of 11 or 19 respectively. Fiberglass insulation for ceilings is generally 10" thick and will have a rating of 38. There are other spray in wall materials but expanding foam is the most used.

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