Installing insulation at the rim joists enhances energy efficiency and acts as an effective air barrier. ... Closed-cell spray foam insulation offers high R-value, ...

The rim or band joists have little structural value, and I have seen homes with no rim joists at all. The floor cavity was exposed to the backside of the brick veneer.

I am a builder, and where I live the codes require insulation, but I have discovered that the insulation Insulating rim joists -- pros, cons and solutions Skip to main content Skip to main content ...

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 ...

Some builders refuse to insulate rim joists because of moisture problems, which lead to mold and decay. When a newly constructed home’s crawlspace is fully enclosed and sealed, a lot of moisture ...

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.