Insulation material for the facade?

Hi,

another option would be, for example, Poroton WDF bricks for retroactive insulation. The insulating effect is certainly not as good as EPS with the same insulation thickness and it is also more expensive. But many want [kein WDVS]. Then it is still better than no insulation.

Regards Nika

Thank you very much for the responses so far! I was now with the practicing chimney sweep in the house to have an energy performance certificate created (order from the seller). I then had a somewhat longer conversation with him about possible measures (roof, windows, facade, radiators, heating). He said that an external thermal insulation composite system (ETICS) wouldn't make much sense. 240 mm expanded clay already has relatively good insulation values, and I probably wouldn't live to see the amortization of a professionally executed insulation; the investment would likely be greater than the long-term expected savings. It's enough to drive you crazy.

Thanks first of all for the previous answers!
He said that an ETICS wouldn’t make much sense. 240 clay aggregate apparently already has relatively good insulation values, and I probably wouldn’t live to see the payback of a professionally executed insulation, as the investment would probably be greater than the long-term expected savings. It’s enough to drive you mad

How old are you?
What is the current heating load of the building or the annual consumption?
How large is the area of the concrete exterior walls?
If you know that, you can better assess how long it will take to pay off.

Such gut feelings from chimney sweeps, etc. should always be taken with caution. One should also consider that you would sensibly apply ETICS or whatever when the façade is being renovated anyway. That means scaffold costs etc. don’t need to be amortized. Only the extra cost for the insulation needs to be amortized. Considering that prices for fossil fuels will rise (CO2 tax, market development moving away from the low point, etc.) and renewable energy is not cheap either, you often have more leeway than you think. In addition, today you can get loans virtually for free. That means the return on insulation only has to be higher than the loan interest.

Regards Nika

Or the other way around: If you ever do work on the facade, you have to insulate it anyway.

The exterior walls of our house consist of 240mm lightweight expanded clay aggregate bricks, and the west side was additionally pimped up in the 70s with "nice" asbestos facade panels, underneath which 30-40mm of glass wool was stuffed.

Not every slate substitute product from that time contains asbestos. I wouldn’t even consider insulating only the weather-exposed side (with only the west, I would assume wind; for warmth, one probably wouldn’t have chosen this option).