Newly Skimmed Ceiling Cracking & Discolouring in New Bathroom - Advice Please

[AnneSA]

Hello,

We’ve just had our bathroom professionally renovated and the our old Artex ceiling skimmed and painted. As you can see in the pictures, the ceiling has started to crack along the full width of the room around the doorway, and another small crack and a small bulge has formed around the shower screen. The ceiling around the shower is also starting to discolour and is turning grey.
For reference, the loft is directly above and there has been quite a lot of movement up there due to problems with our new Aqualisa shower.

Does anyone know what could be causing this and how to fix it? We only had the bathroom redone a couple of months ago and are having endless issues.

Thank you

 

[lostinthelight]

Do you know what preparation was done to the artex ceiling before skimming