Tiny house with metal roof: vapor shield?
I’m building a 20’ tiny house on a trailer with a 3:12 shed vented roof vented. My current plan for the roofing and ceiling structure consisting of 2×6 rafters is as follows: metal roof->water and ice shield->5/8” plywood->XPS foam between rafters->tongue & groove beetle kill planks. I am located in zone 5b with cold snowy winters. Is this layering plan sufficient to prevent condensation issues in the winter? The question is, do I need a vapor retarder between the plywood and xps foam, or between the tongue and groove and the xps, or skip a separately distinct vapor retarder? Thanks for any insights you can provide – I am a complete rookie. For what is worth, the heating will be small wood stove.
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