This standard concerns the design considerations and essential principles for internal plastering systems and application of plastering systems. The standard gives in different parts requirements and recommendations for building details, design and materials considerations, the selection of mixes and the application of gypsum plasters; gypsum/lime plasters; premixed lightweight plasters; anhydrite plasters; lime/gypsum; cement and cement/lime based plasters; lime based plasters, silicate plasters, polymer plasters and polymer modified plasters. This standard does not deal with the following: external finishes; painting and or preparation; impregnations; structural repair of concrete; fibrous plasterwork Because of the many and varied materials and practices in Europe it is not possible for certain aspects of the standard to enter into sufficient detail to be fully usable to practitioners in each country. Such guidance to complement, but not alter any basic European recommendations are given in documentation prepared by each country. Aspects of this European Standard whose basic recommendations may need to be complemented are indicated where they occur by a footnote referencing this clause. Further information is given in Technical Reports as follows: CEN/TR 15124 'Design, preparation and application of internal gypsum plastering systems'; CEN/TR 15125 'Design, preparation and application of internal cement and/or lime plastering systems'; CEN/TR 15123 'Design, preparation and application of internal polymer plastering systems'.