Mineral Wool Underdeck
I am working on a design for a residential addition that includes a roof deck over a living space below. We would like to add external insulation to the top of the deck to reduce thermal bridging. I have enclosed a detail rather than describing it here. My concern is that the mineral wool insulation sandwiched between the DensDeck and OSB may not be able to air dry through the EPDM layer and could create an opportunity for mold and rot. I am wondering if we should just use EPS in this one location.
Thank you in advance.
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