Apparently you can score and snap cement board, it's the recommended way to do it. There's a special tool. At least the Hardie board works that way.
https://www.toppstiles.co.uk/fixing-finishing/preparation/hardiebacker-board/hardiebacker-scoring-knife?gclid=CjwKCAjwq4imBhBQEiwA9Nx1BrDsGY9bTwec4EbCNq9AZdvNxE8TX0K6_eFhiJuvmVmEFys_eovigRoC5bMQAvD_BwE&gclsrc=aw.ds
Some are reinforced with some sort of stranded grid though aren’t they? Although probably not something you’d have to board a garage ceiling. I’m out my depth at this point!
@Nef started
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Apparently you can score and snap cement board, it's the recommended way to do it. There's a special tool. At least the Hardie board works that way.
https://www.toppstiles.co.uk/fixing-finishing/preparation/hardiebacker-board/hardiebacker-scoring-knife?gclid=CjwKCAjwq4imBhBQEiwA9Nx1BrDsGY9bTwec4EbCNq9AZdvNxE8TX0K6_eFhiJuvmVmEFys_eovigRoC5bMQAvD_BwE&gclsrc=aw.ds