Interior stud cavity wet - GreenBuildingAdvisor

Interior stud cavity wet kickstarter | Posted in General Questions on February 13, 2026 08:29pm I have a conduit running across multiple stud cavities in an exterior facing wall. The conduit runs from a cantilevered fireplace bump out to the adjacent wall. I went to fish some wire and noticed the fiberglass batt insulation and the wood behind it were wet near the termination of the conduit on the adjacent wall. There were even some ice chunks inside the insulation. Any idea what could be causing this and what I need to do to get this sorted out? Images below as they won’t attach to the post: https://imgur.com/a/fKkHNSO Answer GBA Detail Library A collection of one thousand construction details organized by climate and house part Search and download construction details Join the leading community of building science experts Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field. Start free trial Related Questions Insulating a stud cavity with no sheathing Foil-faced polyiso in 2"x6" stud bays - with shower wet wall Seal gap between felt paper and interior wall stud cavity? Fill stud cavity with fiberglass insulation? Replies GBA Editor RANDY WILLIAMS | Feb 15, 2026 06:01am | #1 The box used for the low voltage wiring system is an open backed box, which does nothing to stop air and moisture from entering the wall. I occationally see these in my climate, most exibit the same problem, moisture in the ...