Cement rendering is the application of a premixed layer of sand and cement to brick, cement, stone or mud brick. It is often textured, coloured or painted after application. It is generally used on exterior walls but can be used to feature an interior wall.
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Different finishes can be created by using different tools such as trowels, sponges, or brushes. The art in traditional rendering is, (apart from getting the mix right), the appearance of the top coat. Different tradesmen will have different finishing styles and be able to produce different textures and decorative effects.
Traditional rendering of a brick / block surface
To ensure adhesion, the brick or block surface to be rendered is initially hosed off to ensure it is free of any dirt and loose particles. Following this, a strong base coat is applied with the correct additives to dry overnight. The following day the top coat is applied, which is generally a slightly weaker mix than the base coat to ensure a solid adhesion.
Traditional rendering over a painted surface or poor structure
Dependent on the surface, the structure may or may not be hosed off. At this point we would fix galvanised exermet meshed sheets to the surface before the base coat is applied. This will help create a stronger substrate for the base coat, this is left overnight. The following day the top coat is applied as normal procedure.
Thanks to Wikipedia for the original article.