Just never ends...
So this section is likely going to fall off over the next few days. It's Nutec board, plastered to match the walls. This section being slightly raised over the rest of the wall is effectively unsupported. Had asked the plasterers when they were here 2 weeks ago to do a controlled demo, their view was it was strong enough and just to fill the crack
Underneath it's a steel frame structure into which the board is screwed. I'm guessing it's the screws/fixings that's failing.
Any ideas on an alternative that won't come off like this. Thinking perhaps the wood textured board, painted white. Much lighter than with plaster. Other alternatives (although I don't know where to find it ) a metal vent grill going all around.