Since the regulations changed in 2015 with the introduction of BS5534 it is required that any ridge and hip tiles must be mechanically fixed, even if mortar is used. Since this time there have been a range of dry fix hip kits bought to market providing everything you need in one simple package. Ensuring you are installing to the most modern standard, in the easiest most efficient way possible. The dry hip kits include all you need to complete the job, including hip union, hip tray, and screw fittings.
For dry fixing ridge click here, for everything else pitched roof related click here