Thank you very much, yes, informing earlier is certainly correct, but catching all the information beforehand is rather unrealistic. The real shock came when I attended a specialist lecture for builders where very competent information about building materials was provided. That means you grow into the topic. The fact is, from my point of view looking to the future. Thermal insulation made from future hazardous waste, right now the lobby is cashing in and already (knowing this) making a good profit, only to force the property owner in a few years to dispose of the hazardous waste expensively. It is perverse to produce environmentally harmful insulation material in order to protect the environment. I can imagine that there will be mandatory requirements again, insulation with clay and straw??? Whoever has enough money builds with bricks, plaster on top and that's it, and doesn't care about the KFW subsidy. Unfortunately, I am not affected by this blessing. At the moment I still have an alternative, to remain a tenant in an old building. Best regards Frank