Construction costs are currently skyrocketing

Of course, compressible tape and closing sealing tape are used. Foam is not airtight anyway. However, this has been an absolute standard for at least 10 years.

That may be true in theory, but unfortunately it has not yet been realized by all installers in practice.

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That is true regarding the TARGET, unfortunately it has not yet been realized as the ACTUAL for all installers.

I can't even disagree with you on this point. Theoretically, it should be detected in the blower door test there, but in practice, the interior plaster then seals it. And what is not seen in the meantime is no longer seen afterwards. Problems with moisture occur rarely on the window side in new buildings, or if so, then years later (driving rain etc).

Photovoltaics current offer: 53 Trina Vertex S TSM-400DE09M.08 - 400 Watt - Black Frame Module with optimizer and mounting system incl. installation (21 KWp) SolarEdge POWER OPTIMIZER S440 (MC4) SolarEdge SE10K-EN4 with E-Meter Surge protection Charging station openWB series2 standard+ (with 7m charging cable and touch display) and cable holder etc. for approx. €39500 incl. VAT Delivery time up to 24 months I asked around 10 providers for offers, only received this one. Many providers only serve their own local area.

for approx. €39,500 incl. VAT. Delivery time up to 24 months

At these prices, soon every electrician without vertigo will start as a self-employed photovoltaic installer, gold rush mood in the industry, I would and will wait

Yes, there is currently no more material available in the entire photovoltaic sector. Even aluminum profiles for the [UK] are completely sold out. BYD power storage units will be available again at the earliest in early 2023. The little that is available to buy is insanely expensive. But for 39k, a 10kwp storage system should definitely be included. #Danke Osterpaket

Photovoltaic current offer: 53 Trina Vertex S TSM-400DE09M.08 - 400 Watt - Black Frame Module

Regardless of prices and delivery time (terribly bad), look at these modules in reality. I don't like this 2/5 and 3/5 division. The Trina Vertex DE 09.05 look much better visually. These are available up to 395 W.