Although dry verge is easiest to install on a new roof by your roofing contractor, it can also be fitted retrospectively by anyone, presuming the tiles are laid to the correct gauge. It is recommended that before working at height, adequate measures are taken to ensure safety.
Once the verge has been stripped back of any mortar it may be necessary to extend the battens using a batten extension piece (as part of the dry verge refurbishment kit) to provide a 50mm overhang for a suitable fix . It is also important to ensure that the plastic eaves guard is in place before the first verge is fitted. This provides protection against birds and large insects getting into the void.
Further information can be found either in the Marley Sitework Guide, or by contacting the technical department.