/ bouldering on my ceiling?
It'll be reet. They hold your weight when your above them, so they'll hold your weight when you're below them. Plus the ply will spread the load nicely. 10" x 2" joists are massive - new timber in that depth is practically unheard of.
coach bolts would be my weapon of choice or ;possibly expanding bolts although I believe these are designed for concrete not wood .you can also buy serrated nails which don't pull out to back it up ,commonly used on decking.
guess if you could get some nuts and bolts through the floor this would be the ideal fixing but probably not feesible .
need to think it through properly don't want no accidents!
I put a length of ply on my garage roof. I think I put some support baritones behind the ply to stop it flexing. top tip - make sure you check that all your t-nuts are fine before you screw it in place, it will be a pain to change them over if any of them are threaded once it's all screwed in.
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