An insulated basement or crawl space provides many benefits year-round, and the rim joist (or band joist) is often a focal point in energy-saving initiatives. Installing insulation at the rim ...

In colder climates, it is important to insulate the rim joists, also known as band joists in some areas. When floor joists are installed, a board, either a 2×10 or a 1×10, ...

Q: Should we insulate the rim-joist cavities of a crawlspace foundation? I am a builder, and where I live the codes require insulation, but I have discovered that the insulation ...

Rigid foam is the best insulation for rim joists. We chose 2-in.-thick (R-10) "extruded polystyrene." Don’t use "expanded polystyrene," which is a less effective air and moisture barrier.