My tar shingle roof is sloped north-south. Prevailing winds are easterly.
The paint under the north-east edge of the roof peels faster than anywhere else. This indicates that water is being pushed over the edge and trickles down the trim and the brick on the east wall. This is supported by the fact that the wood trim around the windows is also being rotted away
I was thinking of nailing an L-shaped piece of metal or plastic along the edge, to create a small barrier so that rain, on hitting the barrier, will be guided down the roof slope to the gutters, instead of rolling over the edge and running down the east wall.
Does this make sense ? Is this a viable solution ? What kind of L-shaped barrier should be used ?