Spray polyurethane foam on flat roof
What are the pros/cons of SPF on top side of a flat roof, relative to exterior rigid foam insulation? We have a large (600sqft) flat roof in CZ4, and need to 1) increase R value, and 2) increase slope of the overly flat roof that is beginning to mildly pond. Of course, we’d like things to look aesthetically pleasing when complete. Thanks.
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