Here are a few quotes from the construction performance description that the building expert also criticized and wanted clarification on, which Okal Haus was by the way not willing to provide:
"high-quality fiber cement material as plaster carrier" - what material is that? Which manufacturer? Basically, Okal Haus can plaster anything on your wall with that
"quality-tested gypsum fiberboard" - no indication of material thickness
"the spaces in between are filled with precisely fitted mineral insulation" - no indication of the material and/or manufacturer, here too Okal Haus can install anything without your consent
Here is another serious issue that, according to the expert, is outrageous nowadays:
"As an important component in the Okal Haus energy-saving concept, all windows with sashes are equipped with an excellent triple thermal insulation glazing with a Ug value of 0.6 W/(m²·K). The aforementioned specification does not apply to roof windows, fixed windows, or functional glass, such as glazing with increased sound insulation requirements or requirements for fall protection."
This means that all fixed glazing does NOT get triple glazing, which is unacceptable in times of ventilation systems and frequently used fixed glazing...