“Interesting” report.
However, one should differentiate between various facts.
On one hand, whether insulation makes sense – on the other, the economic entanglements and conflicts of interest. The latter are probably no exception in times of American predatory capitalism and can be transferred to almost all areas.
The important question for homeowners and renovators is the success of the insulation measure – also in economic terms.
For an old house from the 60s, insulating only the facade would certainly be the wrong approach and not targeted – except perhaps if the facade had considerable renovation backlog and needed to be renewed. New heating, windows, insulation of the roof or the upper floor ceiling, the basement ceiling… etc. – together with the exterior wall insulation certainly makes sense. Many reports in forums have shown significant energy savings here that pay off after x years.
One must also not forget the aspects of value retention – and of course living comfort, especially in a self-occupied property. Bringing the house energetically up to current standards, preserving the building fabric – so another 40 years can pass.
Despite all the calculations: no one knows exactly how energy prices will develop – but the costs for all energy sources will probably rise. And for example, consuming less energy for 30 or more years…? One should look at the price development of the past 20 years.
In the 80s, some builders who used 4cm insulation were ridiculed. Over the decades, this measure has paid off more than once in practice.
@ Wanderdüne:
The results of the list interested me too. I think I also saw that 0.036x. If I assume it is the WLG 035, it would be a deviation of 0.001. Whether this justifies the panic-mongering or the deviation falls within an allowable tolerance? No idea.
Many aspects were disregarded in this report. The level is rather RTL & Co. and less public broadcasting...