Quality installation of the two types of site-manufactured foam insulation is no easier than fiberglass batt and no less important. Here is how to avoid the most common problems.
By Peter Yost
One of my first research projects when I started at the NAHB Research Center in 1993 was looking into a new insulation: Icynene. We were evaluating its performance as a spray-applied, open-cavity insulation as well as an injection foam in closed cavities. I was enamored: this seemed to be a miracle insulation that installed itself, sealing up tight even in the toughest and most complicated building cavities.
At about the same time, the NAHB Research Center was developing an installation quality program for fiberglass batt insulation, notoriously difficult to get installed right. I scoffed; we would never need that for these foam-in-place systems!
Twenty-plus years later, it’s clear how wrong I was. What looked as easy as point-and-shoot with the foam gun has a lot of complexity. As insulation consultant Henri Fennell recently said to me, “Properly installing site foam insulation is way more challenging than fiberglass batts. It’s partly because performance expectations are high and partly because you are actually manufacturing onsite.”
Fennell has been injecting and spraying polyurethane foam insulation for more than 40 years. I recently got the chance to spend quite a bit of time with him at the Energy Center of Wisconsin’s Better Buildings, Better Business conference. Here are Fennell’s seven top tips for ensuring that manufactured foam insulation jobs—both injection and spray—get done right.