Ceiling in living room was sagging. Inspection of roof space revealed nothing much. After reading on internet wonder if moisture and lack of air flow in roof space was causing a problem?
Anyway looking at ceiling from roof space showed that but the stud adhesive had broken.
So we fixed the ceiling by re screwing it with lots of 32mm screws (screws spaced at 100 to 150mm apart). All seemed to be fine so we patched over the screws.
Now a few weeks later we have this funny screw marks showing thru! See photo. About 10 screws of the hundred or more that we fixed have done this. Very frustrating. What is this caused from? and how do we stop it from happening again? And what might be best way to fix it?
Your advise very much appreciated. Thanks.