Search for information about my Massa house

Hi,
I own a Massa Haus built in 1981. So far so good...
Due to a construction measure, I now need the documents for the structural analysis of the roof.
However, I bought the house second-hand and unfortunately have no exact plans, especially no structural plans.
On the copy of the floor plan that I at least have, the house type is unfortunately not identifiable...
The project number starts with 752...

Does anyone have any idea how to proceed?

See you
Jan

For Massa Haus inquiries, which are now called dfh and include Okal Haus, allstav, and Massa Haus. The builder rarely received the work planning with prefabricated houses, usually only the nice colorful floor plans.

The manufacturer still exists, and they should (re)recognize their models. And there will of course be a building file at the building authority, because "finished" or not, there must have been a building application with proof of structural stability.

Hi again,
I already asked at dfh...
The answer was: the project files are deleted after 10 years, so no information is possible...

Not very helpful...

But I will follow up on the idea with the [Bauamt] - thanks for the idea.

See you then
Jan