Hi I work in a school that is approximately 100 years old, the front facing wall anr roof is edged by what I call flag stones (probably the wrong name I know). Recently we had really cold weather and only now some of the stones have started to blow and crumble. Resulting in pieces falling off the roof. I know the stones are very old and this sort of thing must be expected over time, but how can I seal the blown area and prevent or reduce the crumbling effect. Thankyou for any help.
Crumbling flagstones on the roof edge.
- Thread starter Robpoole
- Start date
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Coping stones 
I would seriously consider having them replaced, If the Bursar won`t go for it -make them stand underneath for all of break-time Best to check if it`s listed or in conservation area. Probably a Mason`s job to advise really.
I would seriously consider having them replaced, If the Bursar won`t go for it -make them stand underneath for all of break-time Best to check if it`s listed or in conservation area. Probably a Mason`s job to advise really.DIYnot Local
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