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How do I plug a floor drain to keep floodwater out?
Remove the floor drain grid, and plug the drain pipe. Some hardware stores sell a plug that has a rubber center that expands to fill the pipe when the top and bottom metal plates are squeezed while placing the plug in the pipe. A flexible rubber ball about 1 1/4 times the inside diameter of the pipe can be wedged into the drain to create a tight seal. The pressure might be quite high, so brace the ball securely with a 2x4 against the ceiling. Hold a board or piece of plywood on the ceiling, and slide the 2x4 against the bottom of the board to avoid damage to plaster ceilings. For a suspended tile ceiling, remove ceiling tiles to get access to the ceiling joists. Span a 2x4 across the two joists, and wedge the vertical 2x4 between it and the ball. Rags or other materials can also be wedged into the pipe to slow the water flow.
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- Coastal Hazards documents in the National Sea Grant Library.
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