Moisture mapping is a non-destructive technique used to identify and locate moisture problems in buildings. This method is commonly employed by structural engineers, inspectors, and building professionals to assess the extent of moisture-related issues, including water leaks, condensation, and capillary action.

## Detection Methods for Moisture Mapping

**1. Infrared Camera Scanning:**
This method utilizes an infrared camera to detect variations in surface temperature. Moisture tends to absorb and emit heat differently than dry materials, creating thermal anomalies that can be visualized using an infrared camera.

**2. Probe Moisture Meters:**
These handheld devices insert probes into building materials, measuring electrical resistance or capacitance to determine moisture content.

**3. Capillary Moisture Meters:**
This technique utilizes a porous material, such as a gypsum block, which absorbs moisture from the surrounding environment. Measuring the weight change of the block can provide an indication of moisture levels.

**4. Tracer Gas Testing:**
This method involves injecting a tracer gas into the building envelope. The gas eventually diffuses through cracks or leaks, allowing technicians to locate moisture sources by monitoring the tracer gas concentration.

## How to Check for Moisture Under Your House?

**1. Visual Inspection:**
Examine the foundation for signs of moisture damage, such as mold, mildew, or water stains.

**2. Moisture Meter:**
Use a probe moisture meter to measure moisture content in crawl spaces, basements, and other below-grade areas.

**3. Condensation Check:**
Place plastic over the floor in areas suspected of moisture problems. If condensation forms on the plastic, it indicates a moisture source beneath the flooring.

**4. Crawl Space Inspection:**
Check for dampness, mold, or standing water in the crawl space. Pay attention to any holes or cracks in the foundation walls or floor.

**5. Sump Pump Inspection:**
Ensure the sump pump is functioning correctly and is draining away excess water effectively.

By utilizing these moisture mapping techniques, property owners and professionals can accurately locate moisture problems and take appropriate measures to address the underlying cause, preventing further damage and maintaining a healthy indoor environment.