I want to hang a motorized projector screen on my basement ceiling. I'd like to know how much weight I can safely hang from the ceiling (joists? See picture below. Arrow marks the spot I'd like to drill/screw at). There's one such structure in the ceiling every 20 inches.
The screen weights 50 lbs and would be hanged from each end. So, 25 lbs on each end.
How do I determine if it safe to hang that and how do I pick the right screw size and length ?
If it makes any difference this is a Montreal house and there's 2 more stories above the pictured ceiling. The room is 18' long, but I don't know if there's a beam or anything midway to hold this joist.