Why does a small appliance leak cause so much hidden damage?
Water from a small leak runs under the appliance and into the cabinet base or the subfloor, where it is trapped. Because the damage is hidden behind the cabinet and the floor covering, it can grow for weeks before it is discovered.
A cabinet base is made of wood or particleboard, and when it takes on water it swells and loses its shape. The floor covering above it can lift or cup, and the subfloor beneath can soften. These materials do not return to their original condition once they have been wet for long.
A leak that seems minor can become a floor replacement when the subfloor is involved. The crew reads the subfloor early in the job, so the decision about repair is based on the readings.
Can the flooring and the cabinets be dried in place?
Often, yes, if the leak is stopped quickly and the materials respond to drying. Cabinets that have swollen or delaminated and floor covering that has lifted usually need replacement, while the subfloor is dried to target.
The subfloor is the material that matters most, because it carries the floor covering and the weight of the appliance. A subfloor that reads dry at the target can be left in place. A subfloor that remains wet or soft is repaired or replaced with the homeowner's agreement.
Cabinet bases and kicks that have swollen usually do not return to their shape, and the crew will say which pieces are affected. The floor covering is assessed for the same reason, and the technician explains which pieces need replacing before the drying starts.
What should I do when the water is coming from behind an appliance?
Turn off the supply valve, move the appliance carefully if you can, and photograph the damage before moving anything. Do not pull the appliance out if it is connected to power or water and you are not sure it is safe.
Water behind an appliance can be hard to see, and it often has nowhere to go but the floor. Use a flashlight to look behind the unit, and check the hose and the connections for wetness. If you find a split or a loose fitting, note it for the plumber.
Only move a large appliance if the power and the water are turned off and you have help, because the hoses and the cords can be damaged. The crew can move the unit when it arrives, and will protect the floor and the hoses as it does so.
How does the crew check for water under the floor?
The crew reads the subfloor from above with moisture meters through the floor covering where possible, and it lifts a small area to check the subfloor directly. It also checks the cabinet base and the wall behind the appliance.
A moisture meter can read through some floor coverings, but the readings are more accurate when the material is open. The technician lifts the smallest area that gives a clear reading, and records where it was taken.
The crew checks the adjoining rooms and the spaces under the cabinets, because water runs along the floor in directions that are not always obvious. The readings show the full extent of the wet area.
How do I prevent an appliance leak from happening again?
Replace worn hoses with braided supply hoses, check the door seals and the drain connections, and place a leak sensor near the appliance. A plumber or appliance technician can inspect the connections and advise on the parts that are wearing out.
Supply hoses for washers and ice makers should be inspected periodically for cracks, bulges and wet spots. Many homeowners replace them on a schedule, and the appliance manual can explain the recommended type.
A leak sensor that sounds an alert on the floor can warn you of water before it spreads. Keep the area around the appliance clear and dry, and check the floor beneath it when you clean.