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and reintroduced into the room from the bricks to the indoor air over time. B U I L D I N G P H Y S I C S A N D M AT E R I A L S 9783035611342_Knaack_Bauphysik_Umbruch2_180409__Finale RZ.indd 109 09.04.18 23:08 110 Steel and moisture The crystalline structure of steel is so dense that the material is entirely watertight and does not allow water inclusion or storage. Moisture transmission through capillary action is not possible ei- ther. Therefore, steel can also be used for water or moisture- proofing on façades or roofs. Many other application opportuni

scope for coloration; resistance to soiling/ ease of cleaning; permeability to vapour and moisture; transmission, absorption and reflection in the infrared, ultraviolet and visible spectra; and resistance to chemical and biological substances (including salts, acids, fungi and bacteria) as well as to mechanical abrasion (hail, vandalism, etc.). In this context, it should not be forgotten that the properties of materials can vary within the relevant tem- perature range and during the estimated life of the membrane. In large-scale projects, the availability

mechanical movements. They can also be used if two materials are chemically incompatible. The same materials can be used as for the levelling courses. Vapour barriers are used to regulate moisture transmission inside the building. > Chapter Pitched roofs, Types of finish They are not waterproof, but simply inhibit vapour diffusion. The inhibition factor indicates how much moisture can diffuse through the vapour barrier. They can be bitumen roofing sheets, plastic vapour inhibiting sheets, elastomer roofing sheets, or compound foils. They can be laid loose or spot