What is the build up of an ETICS?
First, as a rule, ETICS should always be installed by skilled tradesmen. They consist of three layers that are matched to each other: insulation boards, reinforcement layer and external coating of render, clinker, glass or ceramic. Rendered facades can be additionally painted, but this is not always necessary, as mineral overlay renders (top coats) and ready-to-use ones in pasty (wet) form are generally through-coloured.
Layer by layer
First, large-format insulation boards are glued to the masonry or, in existing buildings, to the old facade. Depending on the substrate, the insulation material, the building height and location, the boards are additionally doweled. A special reinforcement layer is then applied onto the insulation material to strengthen the construction. It consists of a reinforcing mortar into which a reinforcing fabric (woven mesh) is embedded. This layer absorbs stresses within the facade and prevents cracks in the base coat render. In most cases, a layer of render (overlay render as top coat) is then applied. Biocide-free mineral top coat renders are particularly durable and eco-friendly. Ready-mixed top coat renders in pasty (wet) form can now also be produced without environmentally harmful biocides. Optionally, a weather-resistant facade paint can be used.
In this classic structure of ETIC systems, the individual components are glued and thus permanently connected to each other. This makes recycling difficult. When the building is demolished, these materials are therefore usually disposed of mixed together instead of being used a second time. Since 2019 the first recyclable ETICS weber.therm circle has been available, which does not require a bonding mortar at all. Each layer's materials can thus be returned to the raw material cycle.