Using rigid foam behind Roxul batts in a finished room over garage
I have done some searching online and on GBA, but I’m looking for a quick and dirty answer to this question. Would it be adequate to fasten 1″ of EPS rigid foam to the cold side of my attic crawl space behind the knee wall in my over the garage bonus room? The floor is insulated from the outside wall in, and the ceiling and slope is also insulated with Roxul batts. I am not interested in insulating the slope behind the knee wall since I am looking to minimize the total square footage of conditioned space. Insulating the bonus room is only half of the goal, the second half is to make that crawl space behind the knee wall more “user-friendly” so I can store things without having to rub against exposed insulation. Thanks in advance for your help!
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