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morsch
on Jan 17, 2023
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The Pretty Good House
From what I can find, the leakage is estimated at < 1% per year. This (German) discussion references and quotes the (German) industry standard DIN EN 1279-3.
https://www.haustechnikdialog.de/Forum/t/65875/Haltbarkeit-A...
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https://www.haustechnikdialog.de/Forum/t/65875/Haltbarkeit-A...