I happened to be home one day during the extremely cold winter days and an odd thing happened, our smoke alarms when off. When this happened I went around to each alarm disabling it and taking it out of it's junction box to inspect the wiring. When I got to the alarm in our bedroom some water poured out when I took it down. I called our general contractor to see what his thoughts were. He mentioned that sometimes warm air can make it's way into the box and condense during these very cold days but I should probably take a look in the attic to see if there are any obvious issue. When I went in the attic I saw frost build up on the nail heads protruding from the roof sheathing so the condensation theory seemed quite feasible. I didn't dig around much more.
Well, a couple of days ago (in warmer weather) Jess was noticing a smooshy portion of the drywall near that same smoke alarm. This time I explored the attic a bit further. I noticed that one of the new vent stacks had an unusual "Y" in it that went nowhere. I think the core issue was that condensate built up in the larger dead end portion, froze, expanded, and burst the end cap.
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