New construction materials are helping cities achieve better environmental footprints when renovating existing structures.
Spray polyurethane foam (SPF), specifically closed cell SPF, has long been used as a roofing material, particularly on flat roofs. SPF serves as insulation, an air barrier and a vapor retarder, protecting buildings from water and other elements. During installation, SPF can be sprayed directly over existing materials that, in many cases, do not have to be removed, which can reduce construction waste.
The application of SPF requires a blowing agent, sometimes known as a foaming agent, to help...Architecture