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How to detect water leaks in walls
Look for standing puddles of water near a wall.
This is the simplest way to tell that you have a water leak in your walls. You can be sure that water is leaking in a wall if you see conspicuously wet carpet or notice that the floor is always wet in a certain area of your home.
You're most likely to see wet flooring near major appliances that use water (washing machine, dishwasher) or in the bathroom near the sink, toilet, or shower. Look for discoloration on a wall.