Roof Dictionary

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I

Ice dam: a mass of ice formed at the transition from a warm to a cold roof surface, frequently formed by refreezing meltwater at the overhang of a steep roof, causing ice and water to back up under roof materials.

Infrared thermography: (1) the process of displaying variations of apparent temperatures (variation of temperature or emissivity or both) over the surface of an object by measuring variations in infrared radiance; (2) the use of an infrared camera to detect moisture in roof insulation.