Climatic conditions (sun, rain, snow, salt, pollution, etc.) and routine maintenance affect building materials.
Water penetrating materials accelerate degradation under the effect of frost, and also the development of mosses.
De-icing salts, sea salts and waterborne salts of often present in the form of mist, penetrate through the surface into the capillary networks, which can disintegrate the systems within the materials.
Other thermal shocks and UV rays are also reasons for premature wear of materials.
Unprotected porous building substrates will be more sensitive to the impregnation of external influences including pollution and various stains, causing physical and cosmetic material degradation.