I am having my bathroom remodeled on a house that was built in 1928. The last time the bathroom was done (30 years ago ?) they dropped the ceiling in order to add more insulation and left the plaster ceiling. I did not own the home but this is the best my contractor and I could figure. I am having them raise the ceiling back up but they are leaving the plaster ceiling in place and putting drywall over it. I have some shelves that I would like to hang from the ceiling and I was hoping they could add some type of wood backing or something for me to mount the hardware that the shelves would hang from. They are telling me I can just get some toggle bolts and go through the dry wall plaster and lathe and it will be supported just fine. The total weight if the items shelves and hardware will top out around 30 pounds. Will the ceiling be able to support this weight with two toggle bolts?