Wipe the shower pan with a towel to remove all moisture on it, especially around the drain area.
Tear off 5-inch strips of duct tape and place them over the drain in the bottom of the shower pan. Press the tape down tightly around the edges to create a watertight seal.
Walk to another faucet in the home and fill a bucket with water. Dump the water slowly into the shower pan and continue until it has 1 inch of water in the bottom. Mark the top of the water line using a dry-erase marker.
Monitor the water once per hour to see if it has dropped below the marker line. If so, look closely at the floors and walls surrounding the shower pan to see if they are damp. If no dampness exists, the leaks may be in the seal between the shower pan and the drain opening.
Check the shower pan drain seal by dropping one to two drops of food coloring 1/2-inch away from the drain. Observe the dye to see if it flows immediately toward the drain, which indicates a leak.
Things You Will Need
- Duct tape
- Dry-erase marker
- Food coloring
- You can also purchase a compression plug from the hardware store and insert it into the drain to stop the flow of water.