Wall Leak Detection

• Paint bubbling, blistering or peeling in a defined patch
• Drywall that feels soft, cool or spongy to the touch
• Discoloration or swelling at the baseboard and along the bottom of the wall
• Flooring lifting or cupping along one wall only
• A musty odor strongest at an electrical outlet or along the base of the wall
• Meter movement with all fixtures off, indicating a pressurized source

Moisture readings are taken in a grid across the suspect wall and adjacent surfaces to find the highest and wettest point. Thermal imaging can show the shape of the wet area behind the finish where a temperature difference exists. On hot-water lines, that difference is usually clear; on cold lines, evaporative cooling can still create a readable pattern.

Before any access is cut, the supply serving that wall is isolated and pressure-tested. Confirming that the section will not hold pressure is what turns a probable location into a defensible one.

Well-placed access is a small opening at a known location, ideally in a low-visibility spot on the same cavity. That is far preferable to a series of exploratory holes that all miss, which is what happens when the search starts with a saw instead of a meter.