Quote Originally Posted by Barton
Actually A steel threaded 3/8 J hook can support up to 80 lbs. In tandem with others supporting the load they can hold much more. A galvanized 3/8 threaded J hook will hold less, they are rated at 40 lbs. U bolts are not adequate for this type of application.
Barton.
Like I stated in the title, you don't use U bolts, You use mounting brackets, and you your self stated the problem with J hooks, only 80lbs, ring bolts, and just about anything that is a sinle monting point has the same problem. And if you do get the rith mounting hardware monting them though the driwall reduses the amont of weight you can put on them . Also hanging the brackets wrong will do the same. One more thing it doesn't mater how sturdy the studs, rafters, and joits are if you just atach it to a small point it won't stay, and it will do a lot of damage.