Abbr. indoor environmental quality

Indoor Air

Air within a conditioned space


Outside air introduced naturally through cracks due to wind and/or negative pressure.

Infrared Camera

Also called a thermographic camera, an “IR” camera is a device that forms an image using infrared radiation, similar to a common camera which forms an image using visible light.

Insulated Sheathing

Non-structural insulating board products with varying R-values and a wide variation in vapor permeability and drainage characteristics. Materials include expanded polystyrene (EPS), extruded polystyrene (XPS), polyisocyanurate (most often foil-faced), rigid fiberglass, and mineral wool.


Thermal: Any material which significantly slows down or retards the flow or transfer of heat. Building insulation types are classified according to form (e.g loose-fill, batt, flexible, rigid, reflective, and foamed-in-place) or material (mineral fiber, organic fiber, foam plastic). All types are rated according to their ability to resist heat flow (R-Value or RSI).