Builder has phoned me and offered to remove the ridge tiles and redo- I told him the dry ridge system would be my preference and will match next door and avoid any more issues with bad pointing work. Architect has been in contact and is planning a site visit early next week. The latest regs. say ridge tiles HAVE TO be mechanically fixed even if they are also mortared on. Builder has used three of these end tiles with a screw fixing (albeit screw hole has not been capped as should be) : https://www.roofingsuperstore.co.uk...okHy1NMF57pTrCbssbw_m944h8mX02BhoCGusQAvD_BwE But do the regs. mean each and every ridge tile has to be mechanically fixed? Or is the fixing in each of the 3 x end tiles sufficient when the others are just bedded on mortar?