Sprayed polyurethane foam (SPF) is gaining global recognition because it provides superior insulating properties by creating a tight building envelope that reduces unwanted air infiltration. Achieving a tight building envelope is the foundation for an energy-efficient building. According to Natural Resources Canada (NRCAN), “air leakage represents 25 to 40 per cent of the heat lost from an older home.” Creating a tight, well-insulated building envelope by insulating and air-sealing with SPF will reduce energy bills significantly when compared to traditionally insulated buildings.