EXTERNAL ENVELOPE Strong enough for a big finish
Kelvin Green of Saint-Gobain Weber explains why render is more than just a decorative feature, and explores the best options for properties built in challenging locations
O
ver recent years, render has had a resurgence in popularity. Modern renders offer more than just a
decorative finish, with features such as through-coloured formulations reducing maintenance, integrated biocide to reduce the natural occurrence of algae on surfaces, and one-coat and pump application to cut time spent on site.
Renders can also be combined with external wall insulation (EWI) providing an aesthetically pleasing finish with the added benefit of reduced fuel bills for homeowners. The versatile nature of render, combined with the range of colours and finishes available, means that it can be used on most properties, no matter the location, to create a home that stands out.
Monocouche benefits
Developments in coastal regions are at much greater risk of exposure to aggressive weather than inland regions. The most vulnerable areas are within 500 m of the coastline, but high winds, driving rain; wind-blown salt and higher UV exposure can affect buildings as far inland as 5 km. The application of a monocouche render can help protect and decorate buildings in these highly exposed areas. Monocouche render consists of a single coat, applied in two passes, it is through-coloured, so there is no need for a top coat or painting, saving time and resources compared to a traditional multi-coat system. Suitable for most types of brick, blockwork or concrete substrates, monocouche render offers a low-maintenance and durable finish with algae and UV resistance. It also allows design flexibility. Monocouche can be used to create a range of finishes including scraped, roughcast or dry dashed, and is also suitable for creating ashlar, key stones and quoin features. A thick render system finished with a roughcast texture or a dry dash aggregate will offer further protection to buildings in severe exposure areas.
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Monocouche render is also ideal for properties that need to be completed within a short timeframe. It allows for fast application, meaning shorter programme periods and site costs. Monocouche render can be trowel or pump applied, and finished on the same day, allowing access to other trades more quickly.
High traffic areas
Properties in areas close to busy roads will suffer from the effects of traffic pollution. This can leave a dark residue or cause discolouration on external surfaces. To stop the pollution penetrating the
facade, a protective coating could be used to create an additional barrier. Using a highly hydrophobic coating protects render from water ingress, oil and graffiti, as well as dirt, stains and other atmospheric contaminants.
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