We just installed(professionally) a 48" barrier free shower for our daughter. We are having great difficulty keeping the water from flowing heavily onto the floor. Does anyone know of something that I could put down with adhesive or caulk to create a 1-1/2" "dam" to force the water towards the drain? This is new remodeling and we want it to last. The shower stall is an Aker 48-S or something like that.