Thermal imaging inspection, also known as infrared thermography, is a technology-assisted inspection method that uses infrared cameras to visualise temperature differences across building surfaces. These temperature variations can reveal concealed issues that are invisible to the naked eye, including moisture intrusion, heat loss through inadequate insulation, electrical hotspots, and the metabolic heat generated by termite colonies within wall cavities.
How Thermal Imaging Works
Infrared cameras detect the thermal radiation emitted by all objects and convert it into a visual image called a thermogram. In building and pest inspections, the inspector scans walls, ceilings, floors, and other building elements looking for anomalous thermal patterns. Areas that are unexpectedly warmer or cooler than their surroundings may indicate a problem that warrants further investigation.
Applications in Building Inspection
In building inspections, thermal imaging is used to detect moisture infiltration through roofs, walls, and windows. Wet building materials conduct heat differently than dry materials, creating a detectable thermal signature. Thermal imaging also reveals gaps in insulation, air leaks around windows and doors, and overloaded electrical circuits that generate excess heat, all of which can be documented in the inspection report.
Applications in Pest Inspection
Termite colonies generate metabolic heat as they consume timber and maintain their nest environment. This heat can be detected through wall surfaces using a thermal camera, alerting the inspector to possible concealed termite activity. While thermal imaging alone cannot confirm the presence of termites, it is a valuable screening tool that identifies areas requiring closer examination with other detection methods such as moisture meters and microwave radar devices.
Limitations
Thermal imaging is a supplementary tool, not a standalone diagnostic method. Temperature anomalies can have multiple causes, and correct interpretation requires training and experience. Environmental conditions such as direct sunlight, heating systems, and ambient temperature can affect image quality. The technology cannot see through walls; it detects surface temperature differences caused by conditions behind the surface.