EPS/XPS a "diffinative" answer?

Calling all - I have searched, read other places, etc. And yet, How bad is 1# eps foam vis-a-vis water absorbtion? Some say bad, other say not really. xps = out gassing = delam. Some say yes, others say they have used it for years w/no problem. I would love to, and will, go one of these ways - but I would like to increase my peace re. what I’m getting into.

Thanks all - Taylor.

grasshopper: all the answers are in the archives; you must search…