Factory-produced cementitious renders provide an attractive, durable finish to brick or block built walls.
The type of mortar used for rendering will depend on the background, type of wall and the exposure of the building. An undercoat and a finishing coat are generally required while in conditions of severe exposure, three coat work is recommended, with the first coat relatively impervious to water and the others more porous.
Renders also play an integral role in providing thermal insulation to buildings as part of external thermal insulation composite systems, often referred to as ETICS for short.
More information on ETICS is available here.
The type of mortar used for rendering will depend on the background, type of wall and the exposure of the building. The information given in this data sheet applies to both traditional and coloured renderings.
The method of use and properties of factory produced rendering mortars are given in data sheet no. 4 of this series ‘Factory produced mortar for external rendering’. This data sheet covers potential problems that, although rare, may occur and it should be read in conjunction with data sheet no. 4.
Rendering mortar is an element of masonry construction and this learning text complements MPA Mortar learning text number 6, Masonry Mortar. Content includes how to specify rendering mortar and describes its various properties in the fresh and hardened state. Also included is an overview of rendered finishes, a glossary of terms and a bibliography, with the final section being self-assessment questions and answers.