Did you apply any type of sealer to the finish coat? I realize that you put
30# felt over the plywood, but any concrete/mortar product that I know of
will allow some moisture to pass. Seems hairline cracks may develop as well due to curing shrinkage and temperature differentials, allowing for
freeze/thaw damage. I'm not criticizing, just asking questions.
Personally, I think metal roofing is hard to beat for durability and ease of
installation.
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