We're getting a bit of a leak from under a sliding glass door in our house. I think the door is original (23 year old house), but I don't know if the patio tile is too. The basic problem is that there is no threshold and I think that water is getting under the track. It is only an issue when it rains, which isn't too often here in Southern California, but we are going to put new carpet in, and we would like to keep it in good shape.
Anyway, what we were thinking of doing is simply trying to plug the seam between the track and patio tile on the outside and concrete slab on the inside with some caulk. Does this seem like a reasonable solution? We are planning on replacing the door with french doors in a couple of years, so if we'd have to maintain the caulk each year, that wouldn't be too big of a hassle.