Search for warm or cold spots on the floor. If no wet spots are apparent on the floor, feel carefully for spots which are warmer or colder than the surrounding area. If hot water pipes are leaking, the floor will be warmer. If cold water pipes are leaking, the floor will be slightly cooler.
Find the pipe layout under the slab. Use a metal detector if the pipes are copper or other metals. A special device is available for finding other types of piping such as PVC.
Listen along the piping lines. With a listening device, listen for changes in the sounds along the pipes. This can indicate where the water is leaking.
Turn off the main water source to the home.
Jackhammer the slab at the point indicated by cold or warm spots or by listening to the area of the leak. The leak may not be precisely at the point indicated but should be in close proximity, eliminating the need to destroy any more concrete than necessary.
Things You Will Need
- Metal detector
- Listening device
- Professional plumbers have electronic devices for finding leaks. If listening for the leak does not yield any information as to the location of the leak, contact a plumber for use of this tool.