I installed a cast iron stove not too long ago and mounted 4 so-called fire-resistant boards from NSP on the wall as fire protection. I then plastered it with gypsum plaster.
The seams are glued and screwed together with a screw through the corners of the boards. Unfortunately, the plaster has cracked at the seams between two of these boards which are located right behind the stove. It also seems like something is moving, when I light the stove the cracks get smaller compared to when the wall is cold.
Of course, I don't want any cracks, so I'm wondering if there's an easy solution to hide these cracks? I considered for a while just applying some more gypsum plaster right at the cracks, but they probably won't last long since it seems like it's moving.
