My plasterer has put up sound board plasterboard (ie much heavier than standard plasterboard) and has used much fewer screws than I was expecting. Approx 20 per board (2400 x 1200) - occasional screw is also slightly too far in. Unfortunately he plastered before I noticed and have only spotted this on the photos (i was preoccupied with the gaps and damage). I am wondering if this is safe or will I be risking pieces of the ceiling falling down.

