Bathroom floor flex help!
I am restoring a 1970 International that I am needing some suggestion on the bathroom which is at the rear. I have flex in the plywood floor when standing at the sink and when flexed can see light from outside. I have done the check for rear end sag problem and the frame only drops about 1/4 on an inch with me on the bumper. I weigh 250 lbs. The 3/4" plywood has definity been wet but is not rotted or punky. The flex area is only about 1" in diameter and sits on top of the holding tank. Since it is not rotted, a way to stiffen seems in order but how??? Any thoughts would be appreciated! Ric