I seem to be having a problem with the mortar falling out of the gaps on the edge of my roof. Its coming out on the end of the house where the tiles sit on it, the red in the picture is where its falling out from. How would this be fixed? Is it a case of just chipping the old stuff out and filling it with new or do tiles have to be lifted? As its on the apex of the house would scaffolding need to be used to repair it or would it be repairable with ladders? If its just a case of refilling it, is it normally expensive- if scaffolding has to be used i guess it will get costly. Would it be letting water into the house if it all fell out or is it more just a cosmetic thing to finish off the tiles?