recent rains revealed a problem on our portico roof--instead of running into the gutters, the water drips down the column and in front of the gutters! So, I went up there and discovered puzzling construction of the flashing channel--tiles broken in half and turned upside down were set there, collecting snail shells and blocking or diverting the water. Why? These tiles are those huge hump ones--about 6" dia. Further up there is a perpendicular wall with 3 humps abutting the flashing, but no end pieces -- just wide open--a brasserie serving escargot ; is that normal ? dripping from roof How should the abbuttment to flashing be finished off? I cleared the down channel of the broken tiles and bent the channel lip open so that a pail-of-water test does not drip . Now I need to find out how to finish the construction of the ends of those 3 runs while still wondering if I need to put those broken tiles back onto the channel.