If your floor or carpeting gets wet near your sliding patio door every time it rains, there is a little maintenance procedure that might help. Your sliding patio door actually “rolls” on a raised center track.  On either side of the track rail there are usually “walls” at least an inch high.  An inside wall and an outside wall.  The outside wall should have “weep holes”… little slits at the bottom of the wall several feet apart.  These weep holes are to drain the water in the track when the rain cascades down