Infrared surveys detect moisture problems by identifying what?

• A. Temperature differentials
• B. Moisture content directly
• C. Structural load
• D. Air velocity

Answer: (A)

Infrared surveys rely on detecting surface temperature patterns. Water in a roof or wall changes how heat moves through the material, so moist areas create noticeable temperature differences compared with dry areas. The infrared camera measures infrared energy emitted by surfaces, which corresponds to temperature. Because moisture alters thermal conductivity and heat transfer (including evaporation effects), those damp spots show up as distinct temperature differentials. This makes it possible to infer moisture problems without directly measuring moisture content. Other factors like structural load or air movement don’t produce the same moisture-driven temperature patterns seen in infrared scans. For confirmation, follow up with moisture meters or destructive sampling as needed.