A new report modeling SPF’s impact on the CO2 footprint of a home over its lifespan finds huge differences in impact, based on the type of blowing agent.

Every time I conduct a webinar about building science or making homes more resilient, I get critical emails from attendees about my inclusion of Spray foam as an insulating mainstay. But I have continued to include it, because in terms of insulating value per inch and air sealing of conventional stick-framed homes, I haven’t encountered anything better in terms of performance.