Originally Posted by Norton
Go with plasterboard aka gypsum. Where you need ceiling access to attic a small square plasterboard panel can be used but better to use cement board you saw at global house. One 60x60cm piece will do. I have 2 ceiling access points using cement board.
Originally Posted by Pink
any know thie plates?
Cement board. Often used for under eves.
In the West, I've done something similar.
We call the ceiling access usually a 'manhole. The cover is usually Gyprock, the same material as ceiling/walls.
The trouble with having a gyprock manhole cover is that it's brittle and the edges/corners can crack/crumble.
To use, as Norton
has suggested, a cement board is a great idea.
I've used something else, but it's purpose is the same as cement board. .