The ability of a material to radiate or absorb radiant energy. Emissivity is usually expressed as a number (0 – 1) or a percentage (0% - 100%) which is determined at infrared wavelengths; the higher the number the greater the ability of material to absorb and radiate infrared radiation.

SPFA believes that the path to a healthful, safe, high-quality and performing SPF installation travels through the hands of a knowledgeable, trained, experienced, and ideally PCP-certified professional contractor.