ABSTRACT
Joint sealants are materials applied in a condition not shaped in advance; after it is hardened or dried it can seal a joint by its adhesive or cohesive properties (EN ISO 6927, 2012). So the main task of sealants is the sealing function and this function is currently heavily used in building industry. In case of joint sealing in external constructions imposed to weather effects, the sealant used has a direct effect on protection of the building against damage due to leakage. Thus, it becomes an important factor of long-term functionality and reliability of the entire building, although it is basically only a solution of small extent of slits in building envelope. However, not only protection of humidity leakage but also penetration of insects or noise are concerned-proper sealing of all slits is also the basic presumption for improving resistance to undesired noise (Kantová & Řihák 2014), (Kantová & Motyčka 2014). Sealants are used in the construction of roofs (Selník et al. 2014). Usage of sealants within surface treatment of interiors when e. g. joining of various materials in corners is required, is one of the most typical and frequent areas. In many cases the sealants are used rather as adhesives for creating a construction joining that must also ensure necessary tightness.
