When hanging Drywall joints on the ceiling, I cut bits of drywall to overlap behind the joint with some cornice adhesive or back-blocking cement. It makes the joint firmer and keeps the joint of the two sheets together. I used the SCO 6-A22 Hilti Cordless Drywall Cut-Out Tool to cut out the access panel – https://amzn.to/2lIb0TY

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