SUMMARY: Is cutting-and-cobbling polyiso into an unvented cathedral ceiling in CZ-2 (hot/humid) safe (re: condensation/rot under decking), if the decking has lasted 43 years with no decking rot, fiberglass batts… SUMMARY: Is cutting-and-cobbling polyiso into an unvented cathedral ceiling in CZ-2 (hot/humid) safe (re: condensation/rot under decking), if the decking has lasted 43 years with no decking rot, fiberglass batts…Read MoreGreenBuildingAdvisor
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