If you do not remove all the existing verge mortar, then you will be
back up there in a couple of years time repointing again.
Use a 4:1 mix, and some rendering (sharp) sand will toughen the mortar
up and give it extra life. Also add some PVA.
Remember to take the tiles off and physically rebed them - don't leave
them on and attempt to push the mortar under them.
Steel verge clips can be obtained from tile stockests.
Plastic verge cappings are propriatary, and are made to suite
different tiles. Check out the Marley and Redland (LaFarge) websites.
In the past we have used a continuous white plastic verge cover which
matches plastic bargeboards. I don't have the contact details to hand,
but I recall that it comes in 5 or 6m lengths and completely covers
the verge of any roof tile - no more repointing. I think it is
manufactured by a company in south wales - European Plastics? and
distributed to a few regional suppliers.
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