Solublesalt Action

If moisture containing soluble salts evaporates from the surface of stonework, then the salts will be left either on the surface as white efflorescence or as crystals within the porous surface layer. If the wetting and drying cycles continue, the crystalline material builds up within the pores to the point at which the pressure produced may exceed the tensile strength of the stone, causing it to crumble. The actual pore size significantly influences the durability of individual stones, but generally the more porous stones, such as limestone and sandstone, are susceptible to soluble-salt action.

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