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Can I use R-tech 1/2" thick rigid foam insulation boards as a ceiling? I have read two posts on here about using foam board on ceilings. Here is my situation. Conversion of a 60 year old 600 sqft barn to a cabin. The part of the roof/ceiling I am concerned with is a section of 10 foot span...

Retired, with a degree in Civil Engineering and some building experience. Converting a 65 year old 600 sqft single story "barn" into a cabin. After much infilling of exterior openings with 2x4 stud walls, exterior paneling and doors then making the roof water tight I am now reinforcing the...