The process is the same for light-weight walls. The only difference is that plaster is used, of course, instead of mortar. Once the plaster is daubed in the opening, a steel angle frame is screwed down on the wall. This frame guarantees higher stability against mechanical loads during the configuration phase. It is not of importance for fire sealing. As an alternative it could also be made of plasterboard. The frame is not necessary for F90 standard light weight walls, in accordance with DIN 4102-4.