I'm trying to hang some pulleys in my garage to suspend a 70lbs kayak from the ceiling, but the ceiling joists run left to right rather than along the length of the garage. My thought is to span the joists with a ~7 foot 2x4 so I can hang affix the pulleys to the 2x4 and hang the kayak lengthwise. My question is:
What are the correct fasteners to use to affix the 2x4 to the joists so that it will safely bear the load, and how many should I use? I attached a diagram, with the black bars as joists and the red bar the 2x4 I'd like to use to span them and hang two pulleys from to hang the kayak.
EDIT: The ceiling is finished with drywall so the joists are not exposed. I would be attaching the 2x4 underneath them rather than above them.