Besides the known physical and chemical environment-elements, also microorganisms are involved at the weathering of rocks in buildings and at monuments. Types of the kind Aspergillus, Cephalosporium, belong Fusarium, Hormodendrum, to the most active salespersons of the molds to Mucor, Penicillium, Spicaria and Trichoderma. They of these organisms produced and secret acids (Oxal, lemons, dextronic acid) are capable to attack rocks directly or to disintegrate these through revocation of cations (about, Fe, m) through chelate-formation. Anthropogene come air pollutions to it, especially aliphatic and aromatic hydrocarbons, that accelerate the degradation of rock.
Sundries base-bacterias and Pseudomonaden are capable for the degradation of different synthetic materials. Formation of acids often is the cause of microbial destruction of constructions. Nitric acid, sulfuric acid or sulfurous acid are formed on that occasion.