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Nearly all, much to the frustration of heritage building owners everywhere. I just spent a few weeks manually chiselling off a godawful cement render from a wall to restore a naturally-hydraulic-lime based one. The cement crap is rock-hard and doesn't have any moisture permeability, so water gets in and just dissolves your building (or more importantly, the old lime-based mortar holding up the dozens of tonnes of stone that is your home)


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