Each zone has specific requirements for how spray polyurethane foam should be applied. To spare you with all the technical jargon, SPF is applied differently from one zone to the next, depending upon climates.
"Both open-cell and closed-cell spray foam are air impermeable and can help to reduce energy losses and avoid condensation by increasing the airtightness of the enclosure if the enclosure is properly designed and the spray foam is properly installed. Open-cell foam is vapor permeable so care must be taken in colder climates to minimize the risk of vapor diffusion wetting of the exterior sheathing. Hybrid applications, known as “flashand- batt” or “flash-and-fill” or “combo systems” consist of spray foam against the exterior sheathing covered with a layer of fibrous insulation. Spraying foam directly against exterior foam insulation is also possible as a hybrid approach but care must be given during the foam application process." Spray Foam Guide, Building Science Corporation 2011.
As a performance-based mid-western spray polyurethane roofing and air barrier company we take understanding the reasons behind the different applications very seriously. We are committed to providing our clients with nothing less than an exception final product so continual staff education in SPF design and installation is a priority.