Remodeling a bathroom in Michigan — 3’x5′ shower, two walls of shower are exterior walls, wall composition is vinyl siding, 1/2″ foam board insulation, 1/2″ sheathing, 2×4 studs w/ 3-1/2″ batt insulation. New cement board and new tile to be put on walls and drypack pan with stone shower floor. What can be done to provide a thermal break so that in the winter the walls and floor will not be ice cold? Thanks.
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