Thursday, October 8, 2009

Fix Castiron Pipe Leaks

Cast-iron piping is common in older plumbing systems.

Cast-iron piping, commonly found in the plumbing of older houses, is usually included in a building's drainage, waste and vent system, or DWV, where pipes are usually 3 or 4 inches in diameter. A leaking cast-iron pipe section is probably flawed, will soon have multiple holes and may need to be replaced shortly by another cast-iron or PVC pipe. However, a patch is able to delay replacement of the section for some period of time. Does this Spark an idea?


1. Shut off the water flow in the pipe.

2. Dry the pipe. Use a hand-held hair dryer, space heater or fan to speed up the process.

3. Clean the area around the hole with a wire brush or a strip of coarse emery paper if the piping is hard to get around with the wire brush.

4. Apply the epoxy or polyester resin using a paintbrush. Apply a coat that covers at least 6 inches on each side of the hole.

5. Wrap a fiberglass strip around the pipe and hole area.

6. Apply a second layer of epoxy or polyester resin.

7. Wrap a second layer of fiberglass around the pipe.

8. Apply a final coat of epoxy or polyester resin.

9. Let the patch cure overnight before restoring water flow in the pipe.

Tags: epoxy polyester, epoxy polyester resin, polyester resin, around pipe, cast-iron pipe, Cast-iron piping, flow pipe