I’m using mostly closed-cell urethane spray foam in this house. The insulators have been on site for a few days. The crew is doing an excellent job and I’m convinced this will be a very tight house.

Here’s an update after completion. The next step after spraying in the foam is to fill some of the cavities with “BIBS” (blown in blanket). BIBS are the white fluff (fiberglass) shown in the photos behind a breathable sheet that is stapled to the walls and ceiling. We did this only in the rafter bays. We also used BIBs only in the garage walls, as it is very economical.