DIFFUSION

The process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration, typically through or across a membrane. For example: Water vapor diffusing from a humid bathroom into the bathroom walls resulting in moisture in the wall assembly.

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.