When a roof repair specialist does repointing they follow a step by step procedure that includes.
Repointing under roof tiles.
3 spread a small amount of roofing cement along the underside of the replacement and slide it into place.
Lift all ridge tiles remove all cement and dust off tiles replace any damaged tiles ridges prepare new cement 3 parts sand to.
Also pry or force out any nails.
Under ridge capping on hips and locally replace bedding.
2 repoint all ridge capping with flexible pointing compound.
2 break the faulty tile and remove the pieces.
Cracked or broken roof tile 1 carefully pry up the tile or tiles just above the cracked or broken one.
If a tile becomes loose it needs to be rebedded.
Replace cracked roof tiles.
First quote was 1600 for repointing approx 150 caps and replacing approx 30 tiles.
Second quote was for 1200 for same as above but also rebedding 12 of the worse caps and including grinding away some existing old concrete pointing to allow pointing a better hold.
1 put on heavy work gloves and safety glasses.
This is how i cement roof tiles pointing the verge in with two coats of cement the cement i use has black dye mix in it to help match the roof tiles in colo.
Here are my 6 steps to remove and correctly replace the cement under a ridge tile if you are looking to replace the cement on a gable apex then you need this page instead.
Re bed these ridges on fresh mortar.
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This involves carefully removing the tile.
Checking for loose tiles.
Inspecting each tile in turn using a probe to check for loose cement.
Repair loose or cracked cement roof tiles by lifting up adjacent tiles and sliding new tiles under the wooden batten that holds the tiles to the roof.