Einführung ins Flächenklappung

We need an German to English translation for the folding roof surface.

From Bernd Kuppers book:
German
Erweiterung
Einführung ins Flächenklappung

English
Extension
Introduction to Surface Folding


Plane Joinery?
Maybe the "Joinery Plane"?

Yes, it's the plane where you develop the geometrical lines for the rafter joinery.

Roof Surface Plane
Dachfläche
Dach = Roof
fläche = Surface
Ebene = Plane ???

flächenklappung
flächen = Surface
klappung = Folding