Sipping coffee in the basement and contemplating the upcoming insulation led me to catch two issues just in time. One was the range hood. The second came to me while staring at the framing around the windows. It is a similar issue to the three inch thermal break gap, which I had to plug.
Spray polyurethane foam (SPF), in particular the open cell foam, has a very high expansion rate (about 1 in 100). When spraying it around the relatively small area around windows opening, it would be hard to control and could easily get all over the window frame and glass.
To prevent this we need to close the framing of the window opening with drywall. Well, I say we, but can’t really take credit for this, because Cathy did all the work.
She also installed drywall around the door opening, which needed the same protection from the rapidly expanding SPF.
I think this will not only protect our windows and doors, but it will also make the installation of the SPF easier.