Started on the northwest roof last night after work. Pulled off the gutter and when I removed the drip edge I could smell 'attic'. It appears as though the top 2" of facia and the last 1" or so of sheathing is gone. Probably from me beating on ice dams with hammers before I knew how a roof worked. But I had to stop and work with the tarps because of loss of sunlight. You can't see it in the rafter layout above, but I have a valley coming in to the eastern side of this roof section:
To make sure no rain got under the tarp, I weighted them down OVER the ridge and duct taped them to where the gutters were. But I am concerned that rain coming into that valley will run under the tarp from the side. I laid 14' 2x6 along and on top of that edge of the tarp, but I was wondering if there are better methods of holding them down?