Help! I have a second story uncovered porch that is leaking. It is over the front door of our home and is 15 by 15 in size. When we rebuit the porch, our contractor (since fired) used new treated joists, plywood, backer board and then tiled with an outdoor tile. The porch began to leak almost immeadiatly. It has stained the ceiling below, is causing the new flashing to rust and has damaged the concrete of the porch below it. Do you have any idea what we need to do to correct this problem?