Air-Sealing and Thermal Bridging of Fire Walls
(climate zone 4)
For a set of 6-7 connected townhouses, is one of the middle units able to be a warm roof with exterior insulation while the surrounding are cold roofs?
My main concern with this is the air sealing + thermal bridging of the fire walls between units which seems to just be an uninsulated CMU type wall for soundproofing + fire wall code. Would one need to spray foam or use rigid insulation to break that thermal bridge and air seal?
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