I redo the basements flint of my half-timbered house and I reuse the white chalk stones for the beam supports, I would like to know how to waterproof these stones as they will be outdoor.
The white stones are formed of a particularly porous limestone, sensitive to capillary rise. Once the stones and joints are finished, however, you can effectively reduce their porosity, and increase their resistance to water, applying a water repellent "refusal", ideally using a sprayer. A refusal means that one liquid until the saturation of the stone, until the liquid does not enter the stone. An insulating footing will be necessary if the white stones rest directly on the ground.
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