How to repair detached ceiling plasterboard?

[nugley]

I noticed that my ceiling has shadow lines and when inspecting from inside my roof cavity there are areas of my ceiling that have detached from the ceiling joists where I can fit the tip of my finger in between. This detachment can be observed across 3 or 4 ceiling joists and I've noticeable this in two areas that are more open spacd. I'm just wondering if it's still possible to re-screw or whether the ceiling plasterboards need replacing?

I suspect the detachment occurred from old termite damage to the walls where the tiled roof was sitting on the homes' brick veneer back in 2014. The roof was hoisted and the walls repaired. Over time the detachment probably just got worse. The place is relatively old as it was built in 1988.

Keen to hear the community's thoughts.

[MitchellMc]

Is there a particular reason you feel you need to fix it, such as the plasterboard visibly bulging when viewed from inside the room, @nugley? If the sheet looks flat and tidy, and you’ve already glued and screwed it, it’s not necessarily a problem that it isn’t sitting perfectly flush against the joist. There’s usually a slight gap anyway due to the thickness of the adhesive. So, unless you can see a noticeable bulge or unevenness, it’s really just an aesthetic issue rather than a structural one.

If the glue has already cured and bonded to the back of the plasterboard, trying to remove it will likely damage the sheet beyond repair. The only way to fix it properly would be to cut out that section of plasterboard, clean off the adhesive from the joist, and then patch in a new piece. If it looks fine from below, though, I’d suggest leaving it as is.

Mitchell

[Dave-1]

Good Afternoon @nugley 

Lucky I am on a flexi Tho really should be outside working on the privacy fence. 

11 years 6 months ish later and still going strong.

Only cracks I have are in the cornice above the header, most probarly from fixing the loungeroom floor that was dipping die to no studs between the beams holding the floor up above the garage. 

Nice prop work, I have used something similar fixing the beams in my garage but much more heavy duty

Dave

[nugley]

Thank you for the response Mitch. I've decided to follow your advice and leave it as is. It was purely for aesthetic reasons.

[nugley]

That's held up really nicely. Thanks for showing me your works