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If you're trying to find the joist behind the drywall, it is basically trial and error. Start drilling a hole; if you feel it pop through to the other side, there's not a joist there. You can also try to locate the joist by knocking with your knuckles (it will sound hollow if there's no joist) or using a studfinder, but neither method is foolproof.

ANS 2 - Using a good studfinder IS foolproof ! -Do you seriously think carpenters, framers and electricians rely on "knocking with your knuckles" - LOL.

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Q: The ceiling is already drywalled so how do you get the hole in the joits without taking down the drywall?
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