Sometimes the basement floor is only a couple of inches thick, not enough for WaterGuard. In cases like this, we would use a FlowGuard system. FlowGuard will use the concrete footer as the bottom of the "pipe." It creates a small space beneath the floor for the water to flow in the newly made channel. It is a great system, and a nice alternative for those homes where it is needed. DryZone still adds the CleanSpace liner to the bottom of the wall to prevent water to "jump the drain" when it comes through any small cracks in the wall.