I think the major damage was caused by ice dams, but you know what? I'm thinking now that condensation is forming on the underneath side of the metal roof and running down, then into the wall down there at the end! The gutters are clear, I just checked, and draining well...
There is still a good inch of ice still on the top of the shop in all but a couple of areas...so you've got warm air in the shop coming in contact with that ice cold tin roof (it's almost 50 degrees out there now.)
I vacuumed up as much of the flood as I could, but it's still dripping. I put down buckets, turned on a fan and turned on a dehumidifier. Probably don't want to heat up the shop though...
Well if you heat it up but the air is still dry the condensation might not be too bad.