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Hello,
I started a refurb project in my laundry and discovered that the section of the ceiling that is lower is not connected to the wall and is therefore freely moving.
I can push it up and see inside the ceiling cavity.
The walls are brick covered in plaster but I’m not sure what the ceiling is made of.
The middle section of the panel is also sagging a little and I don’t have funds for a professional to come and repair the whole section of ceiling.
Any advice would be greatly appreciated 
Welcome to the Bunnings Workshop community @claireh88. It's brilliant to have you join us, and many thanks for your question about securing a drop ceiling.
It sounds like the main issue is that the drop ceiling wasn’t properly fixed to the wall when it was installed. Ideally, a bracket or a timber offcut should have been mounted behind the plasterboard to provide a solid point for securing the ceiling. Now that the ceiling is in place, it’s difficult to create that backing without removing panels.
The first question to consider is whether it really needs to be rigidly mounted. If the gap only appears when you push the ceiling up, a simple cosmetic fix might be enough. You could run some white gap filler along the corner, which will both seal the gap and help hold the ceiling in position. Alternatively, you could apply joint tape over the corner and plaster over it for a smoother finish.
For the sagging middle section, the issue is likely a lack of support behind the plasterboard. The most thorough solution is to remove the affected panel, investigate the cavity, and install timber mounting points so the plasterboard has something solid to attach to. Once that’s done, you can reinstall the plasterboard and finish it so it’s secure and level. This is a bit more work, but it will prevent further sagging in the future.
Please let me know if you have any questions.
Mitchell
