Detail of conditioned room floor above unheated concrete walled garage Zone 5
I’m working on finishing off an office above a concrete walled garage built into hillside. Humidity is high in summer and water table is too, so lots of moisture around the concrete on garage level. Planning to condition (heat+cool) the office level with a mini split, and want to be sure I follow good building science in the garage ceiling to properly keep garage-level moisture at bay. Would it be wise/unwise to use Zip Sheathing on garage ceiling to be a moisture barrier? And for insulation in garage ceiling are there any hygroscopically preferred choices–rockwool, closed cell, fiberglass Batts, cellulose? Thank you for any comments or ideas.
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