Search
    back
    CORROSION EXPERTS

    07.07.2022 Dark façade coating for ETICS renovation? Possible with DÖRKEN

    Those looking to paint their façade in a dark colour should take care to ensure that paint and paste are tailored to one another. How practical if both components come from the same company.

    Once property owners make the decision to paint their façade, it is important for the coating to offer consistent protection as well as enabling an individual colour scheme. What few people know: the aspect of the heat radiation of sunlight also needs to be considered. Because the colour of the façade, the warmer the surface will be, and at temperatures above 80°C the result may be cracks in the rendering system or warping of the insulation material. This is the case in particular with external thermal insulation composite systems (ETICS), in which mostly styrene is used. For this reason, the Federal Paint and Property Protection Committee (BFS) recommends only using colours with a so-called luminosity of 20, as otherwise high thermal loads may result from the temperatures. What this means: the luminosity measures the lightness of a colour and states the amount of energy reflected from the façade in the area of visible light. The scale ranges from 0 (black) to 100 (white), in other words: the darker the colour, the lower the luminosity.

    Trend towards dark colours – a problem?

    More and more property owners want a dark colour for their façade. It is therefore advisable to use so-called IR pastes, which are mixed with the façade paint. The infrared pigments that these contain reflect the invisible heat radiation, resulting in the surface heating to a lesser extent. As a comparison, this means: a house façade with IR pastes warms to a maximum of 70°C and the surface is therefore unharmed – whilst with standard pigments the critical temperature of 80°C is already reached after 10 minutes. These means that dark colour tones such as RAL 7016 and RAL 9005 can be used on the façade.

     

    smallRetina 02:20:08 mediumAlias 02:20:08 large 02:20:08 xlarge 02:20:08

    A one-stop composition

    The combination of façade paint and paste delivers especially good and effective results. “At Dörken we can do both paint and pigment pastes,” says Frauke Lauster, Product Manager Tinting Solutions at Dörken. “This enables us to offer our customers a perfectly co-ordinated combination. Our IR pastes can be used with LUCITE® HousePaint, for example.” The silk-matt façade paint is ideally suited for mineral surfaces such as concrete, brickwork, render, but also external thermal insulation composite systems. “With LUCITE® SilicoTec we also offer a silicon-hybrid façade paint with structural-physical properties according to DIN EN 1062 with V1 and W3, making it ideal for the renovation of ETICS. We are now also able to offer the product in the popular dark colour tones below HBW 20 with low heating, thereby contributing to the longevity and sustainability of the façade.”

    The one-stop option for the paste and paint components is thanks above all to the 2020 merger of the firms CD-Color and Protec Systempasten (together with Dörken MKS) to form Dörken Coatings. This enables the expertise of all the companies to be used to generate effective synergies and provide benefits for the customers.