Fix the plaster in the area of the door frame

Hello everyone,

we have several spots on the door frame area in our detached house (built in 1965) where the plaster was loose and crumbled off. This has created a gap of about 10mm width, as the old plaster runs under the door frame. Apparently, the plaster was applied first and then the frame was installed. Now I am facing the problem that I want to (partially) replaster the walls soon, but we do not want to remove the door frames (they should be refurbished later).

How can I create a clean plaster edge despite the gap at the transition to the frame? Do I need to fill the gap beforehand? My first thought was to fill the gap with expanding foam and cut it flush with the frame using a utility knife, but I heard that expanding foam can warp the frame!? What would be a clean solution here?

Best regards
Andreas

It was apparently plastered first back then and then the frame mounted.

This is still how it is done professionally today. Remove the frames, plaster the walls, and then reattach the prepared frames. If you plaster/patch around the frame, you won’t be happy with the walls.

Fully agree with ypg. Remove the frame and properly plaster up to the door opening again.

Is the frame standing on or in the screed? I also know that frames used to be placed on the pipe floor and thus stand in the screed. Then removing it without destruction is actually impossible. What speaks against plastering the frame again as before? You can fill the gap with mortar. 2k frame foam should also work for filling. It does not expand as much as regular PU foam.

The frames are not set in the screed. They are nailed. I will try to remove one. However, since we have 14 frames of this type, it is quite a lot of effort. For me, it has to be worth the effort compared to the benefit.