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How durable is it?

A high quality external wall insulation system has a minimum lifespan of 30 years and should have been tested by the Building Research Establishment (BRE) or British Board of Agrement (BBA). For added peace of mind, the PermaRock WarmHome system has a materials guarantee of 25 years and is also supplied with a  matching 25 year SWIGA guarantee to cover the installation.