hi all, this is my first time on this so pls go easy.. I'm trying to put a projector on to the ceiling of our ground floor rented flat, i think the ceiling is drywall but I'm not to sure, the instructions advise that i screw the mount into a joist. i have no idea where the joist is, and the ceiling is not letting me screw any further then a few mm...
can any one help me pls..