Moisture Mapping is the process of identifying areas of moisture within a structure or building envelope. It is a crucial step in diagnosing and resolving moisture-related issues, such as mold growth or water damage. Moisture Mapping can be performed using various methods, each with its own advantages and disadvantages.

### How to Check for Moisture Under My House?

**1. Visual Inspection:**

* Inspect the foundation, crawlspace, and basement for any visible signs of moisture, such as water stains, mold growth, or efflorescence (white powdery deposits on walls or floors).

**2. Moisture Meter:**

* Use a moisture meter to measure the moisture content of building materials, such as wood, concrete, or drywall.
* Moisture readings above 15% generally indicate moisture problems.

**3. Infrared Camera:**

* An infrared camera can detect temperature differences caused by moisture.
* Wet areas typically appear darker or cooler in infrared images.

**4. Condensation Test:**

* Place a piece of clear plastic over the suspected moisture source (e.g., a crawlspace vent).
* If condensation forms on the plastic within 24 hours, it indicates the presence of moisture.

**5. Tracer Gas:**

* Tracer gas is injected into the building envelope and monitored for leaks.
* Any leaks or areas of high moisture content will allow the gas to escape, indicating moisture problems.

By using these methods, homeowners can effectively check for moisture under their houses and take appropriate measures to address any issues promptly, preventing costly damage and health concerns.