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Is there an optimum somewhere between a fully-mortared wall and a drystone wall? i.e. mortar which gives some reinforcement but also allows rain or groundwater to run out?


You sometimes see a drystone wall that has a mortared top. Here's one example: https://www.google.co.uk/maps/@51.8862561,-2.0573352,3a,24.1...

Just down the road there's another, less attractive, example: https://www.google.co.uk/maps/@51.885003,-2.0568722,3a,46.6y...


Use natural hydraulic lime mortar, which is flexible and breathes.




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