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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