I'm looking for a good way to shield the tops of exposed horizontal beams. These are 4x12's that extend about 18" (cantilever) out from the bargeboards (gable end fascia). The main problem is that the tops are level and it's a place for water and dirt to accumulate. I'm thinking of spraying on some tar, just on the horizontal portion, or more expensive, something like "Low Profile Copper Beam Caps".
Thanks for any ideas.