Water Pooling On Shower Curb . Posted by 5 months ago. Faucet leaks are common, but for them to cause pooling, they need to be severe or occur over a long period of time. Collapsible Shower Water Dam (Shower Water Retainer) Bulk StayDry from www.pinterest.com The top of the curb should have. A good shower curb helps keep water contained in the shower and prevents your bathroom floor from soaking. Thick mortar to the outside of the curb while the straight edge is on the curb.