SOLUTION

WJE modeled the thermal performance of the skylight assembly using THERM, a computer program designed to map the expected temperatures of material surfaces within a building assembly. The assembly was modeled using the dimensions and construction as shown on the design drawings and manufacturer's data; it was additionally supplemented by field observations.

WJE utilized blower door testing to identify areas of air leakage at windows, doors, skylights, interior walls, and floor edges. A survey of the exterior walls was performed with an infrared camera. The camera detects thermal anomalies in the surface when there is a temperature difference between the interior and exterior, such as a cool night and warm unit interior. Wet materials conduct heat and those areas of higher thermal transmittance can be "seen" with the camera. Inspection openings are required to confirm the conditions observed by the infrared camera or moisture content survey. Cavities with little or no insulation are also detected as well as areas of air leakage movement from the interior to exterior.

The moisture content of the exterior sheathing from the interior was tested using a Delmhorst meter from the interior to the back side of the wafer board sheathing.