I am adding storage floor space on top of my existing garage. I will be putting in a couple of 3" X 10" support beams under the ceiling joist in order to change the ceiling joist into floor joist. The existing ceiling has 1/2" sheet rock. Do I need to remove the sheet rock where the beams are going to be placed? Or can I just put the beams up against the existing sheetrock? The floor load is just for standard household storage stuff.