You could easily do this on a drywall ceiling, too. Oh, and the projector pictured is the InFocus SP8602. I would opt for one of those if I owned a projector and wanted a more permanent installation. But I constructed this solution in about two hours and it’s more versatile for temporary use.

Yes, I know Monoprice and others sell mounts for around $15. Insert the board up through the eye bolts and thread on the nut. Then open up the lap links with two needle-nose pliers and join the eye bolt to the eye screw sunk in the wood. Pre-drill holes in the joists and sink the small eye screws. Once the holes are drilled, hold the board up to the floor joists and mark through the holes where the eye screws need to be sunk. Use a drill press if you can to ensure the holes are perfectly vertical. Drill holes the size of your eye bolts in each corner the exact distance between joists. You’re going to want to make sure that it’s a few inches longer and wider than the span between the floor joists and the projector. Four 1/2″ x 8″ eye bolts rated for 300 lbs – $3.49 each.Four lap link connectors rated for 225 lbs – $0.89 each.A pack of 4 eye screws rated for 95 lbs – $1.59.It’s really quite simple in design and construction.The mount is also very adjustable thanks to the eye bolt located in each corner that allows for quick and simple height adjustments. The eye screw is sunk into the floor joists (my office is in the basement) and the projector board rests on eye bolt’s nut. I ended up with this concoction: 1/2 eye bolt connected to a small eye screw by an open-ended lap link along with a random board from my scrap pile. This way it wouldn’t break if something accidentally bumped it. I also needed the mount to be somewhat shock-proof and not rigid as it would hang only 6.5 feet from the ground. This way I didn’t have to worry about the projector’s size, weight or if they needed a particular mounting bracket. I had a couple of ideas in mind, but they all revolved around hanging a board from the ceiling where the projector would sit. It would also need to come down when not in use. I also wanted some truly universal, allowing me to review projectors of all sizes and shapes without worrying about their weight. However, I’m cheap and didn’t want to spend any money on a mount. The obvious solution was to mount them on my ceiling. I was getting in a couple home theater projectors for review, but I didn’t want to just sit them on a table in the middle of my office.

Long ceiling mount for projector