as in a ceiling. The difference can be illustrated by the fact that an insulated attic floor is the primary thermal control layer between the inside of the house and the exterior while the entire roof (from the surface of the roofing material to the interior paint finish on the ceiling) is part of the building envelope. Building envelope thermography involves using an infrared camera to view temperature anomalies on the interior and exterior surfaces of the structure. Analysis of infrared images can be useful in identifying moisture issues from water intrusion, or interstitial condensation. Other types of anomalies that can be detected are thermal bridging, continuity of insulation and air leakage, however this requires a temperature differential between the inside and outside ambient temperatures. See also Architectural engineering Building enclosure commissioning Mechanical engineering Structural engineering Leaky condo crisis References External links Training Material (software, presentation slides, e-textbook, case studies, templates) on Building Envelope - Natural Resources Canada Ontario Building Envelope Council British Columbia Building Envelope Council Alberta Building Envelope Council-South Chapter Construction Moisture protection Thermal protection Architectural elements