CEN/TC 125/WG 5 - Application of external rendering in masonry

This European Standard deals with the design considerations and essential principles for internal plastering systems and application of plastering systems.
The different parts of the EN 13914 series of standards specify requirements and recommendations for detailing, design and material considerations, the selection of mixes and the application of gypsum plasters, gypsum/lime plasters, lightweight plasters, lime/gypsum-, cement- and cement/lime-based plasters, lime-based plasters, clay plasters, silicate plasters, organic plasters, polymer-modified plasters, etc.
This standard does not deal with the following:
-   external finishes;
-   painting and/or preparation;
-   impregnations;
-   structural repair of concrete;
-   prefabricated fibre-reinforced plaster elements.
Owing to the many and varied materials and practices and different climatic conditions 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 is given in documentation prepared by each country. Aspects of this European Standard, the basic recommendations of which may need to be complemented, are indicated where they occur by a footnote referencing this clause.

This European Standard specifies requirements and recommendations for the design, preparation and application of
-   renders based on cement, lime or other mineral binders, and/or combinations thereof, masonry cement and polymer modified binder based external renderings, in accordance with FprEN 998-1 or site made renders;
-   renders based on organic binders in accordance with FprEN 15824
on all common types of backgrounds. It includes rendering on both new and old backgrounds and the maintenance and repair of existing work. This document gives guidance on the use of established site, factory and semi-finished factory made renders.
This document does not cover the following:
a)   the use and application of special renders for liquid retaining structures, e.g. coatings, and for backgrounds to cladding systems;
b)   the structural repair of concrete;
c)   the installation of external thermal insulation composite systems (ETICS);
d)   the specification and use of sealants used to seal joints for use with rendering;
e)   the use of gypsum based renders used externally, but their use may be permitted in some countries;
Gypsum based products soften when subject to prolonged moist conditions. The use of such products externally will depend upon the climatic conditions where the render will be used and on the local building traditions. With the exception of some drier countries in southern Europe gypsum based renders are generally not recommended for external use and are therefore not included within the scope of this document. However, their use may be permitted and controlled locally. )
f)   renders on historical monuments or buildings in protected areas which may be regulated by national codes;
g)   the design and installation of flashings at windowsills and elsewhere.
Because of the many and varied materials and practices and different climatic conditions 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. Appropriate guidance to complement, but not alter any basic European recommendations is 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.

This document concerns the design, preparation and application of plaster with polymer as the principal binder type, for internal plastering on all types of background used under normal conditions. It includes plastering onto both new and old backgrounds and the maintenance and repair of existing work. It concerns materials, backgrounds, preparation of the surface to be plastered, choice of suitable polymer plasters, methods of application and inspection and testing of plastering.
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.

This document concerns the design, preparation and application of internal plaster and plastering systems based on cement and/or lime for internal plastering on all types of background used under normal conditions. It includes plastering onto both new and old backgrounds and the maintenance and repair of existing work. It concerns materials, backgrounds, preparation of the surface to be plastered, choice of suitable cement and/or lime plastering system, methods of application and inspection and testing of plastering.
Cement and/or lime plastering mixes with special properties intended to enhance thermal insulation, fire resistance, acoustic insulation and to increase radiation absorption are also covered.
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.

This document concerns the design, preparation and application of plaster based on gypsum, for internal plastering on all types of background used under normal conditions. It includes plastering onto both new and old backgrounds and the maintenance and repair of existing work. It concerns materials, backgrounds, preparation of the surface to be plastered, choice of suitable gypsum plastering system, methods of application and inspection and testing of plastering.
Gypsum plastering mixes with special properties intended to enhance thermal insulation, fire resistance, acoustic insulation and to increase radiation absorption are also covered.
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.

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:
¾   external finishes;
¾   painting and or preparation;
¾   impregnations;
¾   structural repair of concrete;
¾   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 documen
-   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:
prEN/TR XXXX (Gypsum) 'Design, preparation and application of internal gypsum plastering systems';
prEN/TR XXXX (Cement and/or lime) 'Design, preparation and application of internal cement and/or lime plastering systems';
prEN/TR XXXX (Polymer) 'Design, preparation and application of internal polymer plastering systems'.

This document specifies requirements and recommendations for the design, preparation and application of cement, lime or other mineral binders, and/or combinations thereof, masonry cement and polymer modified binder based external renderings, on all common types of backgrounds, to both vertical walls and horizontal soffits. It includes rendering on both new and old backgrounds and the maintenance and repair of existing work. Renders with organic materials as the principal binder are not included in the scope of this document.
This document gives guidance on the use of established site, factory and semi finished factory made renders.
NOTE 1   Because of the many and varied materials and practices in Europe it is not possible for certain aspects of the document to enter into sufficient detail to be fully usable to practitioners in each country. Such recommendations required to complement, but not alter any basic European recommendation are given in documentation prepared by each country. Aspects of this document which may need to be complemented are indicated where they occur by a footnote referencing this paragraph. Due to the wide range of climatic conditions in Europe, it is not possible to recommend precise drying times for backgrounds and render coats. Any times given are for guidance only.
This document does not cover the following:
a)   the use and application of special renders for liquid retaining structures, e.g. coatings, and for backgrounds to cladding systems;
b)   the structural repair of concrete;
c)   the installation of proprietary external thermal insulation composite systems (ETICS);
d)   the specification and use of sealants used to seal joints for use with rendering;
e)   the use of gypsum based renders used externally, but their use may be permitted in some countries;
NOTE 2   Gypsum based products soften when subject to prolonged moist conditions.  The use of such products externally will depend upon the climatic conditions where the render will be us