I live in Minnesota in a single story rambler with full basement. In an upstairs corner bedroom I started noticing some water leaking in the closet ceiling a week or two ago (picture is current, it started much smaller).
We've had a record amount of snow fall this year. When I first saw the leak, I realized that my roof vents were covered with snow. On Christmas day, I shoveled off the entire roof. Since then we've had a few light snows and warm days too, so there's been some accumulation then melting. Right now there's nearly no snow on the roof, and the gutters still have some ice in them.
But the leaking is getting worse. Now has spread across the entire edge of the wall.
There's also water dripping into the inside of that window, and there's a stalagmite icicle in one of the windows about 6-8" tall.
Today I went into the attic to look for a leak. I was unable to find one, however.
There were a couple spots under vents or pipes were a little frost came through and melted, and underneath the insulation was slightly damp (and frozen).
But, as best as I could see, near the edge of the house above the ceiling in the pictures, there was no evidence of wetness or frozen water. Not any amount I would expect to see based on the damage. Now, on the roof above there is a thin layer of frost - across much of the length of the house actually. Could that be melting on warm days and dripping down? But yet I don't see any wet spots, if I push the insulation away I can see the wet ceiling board, but the insulation isn't really wet and there's no signs of where it's running down from and dripping from.
There were also a a spots where the insulation was contacting the roof at the edge of the house, directly above where the leaks appear. I thought perhaps moisture was being wicked down. I've moved the insulation so that it doesn't contact, but again it wasn't wet indicating that it was the source of the leak.
How do I figure out what needs fixing here?