I have some water ingress from cracks/failed pointing in a sandstone wall. As far as I understand I should be using a lime mortar for repointing based on a purely lime and sand mix but I keep seeing different mixes recommended, varying from 1:5 to 1:3. Assuming I can get hold of some lime can someone give me an idea for the correct procedure for mixing the lime mortar and the mix I should be using?
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