I've a external toilet and outhouse that im going to be taking down which will expose a old granite (plus random other stones) wall, I've noticed the old mortar is very crumbly and dusty so i expect it wash away with rain if i dont render or plaster the wall.
Does anyone have any knowledge on the best way to do this ?
seems a shame to cover old stone with render that then needs constant painting and then damp pushes it all off in two years?????? . Can you not power wash it all out and then lime point it all to keep some kind of feature.
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