I'm working on finishing my 1924 home's basement in Minnesota and am currently working on insulation. My rim-joists look like this:
2x8 Joists with a board between each joist. Behind that board is a bit of concrete and a bunch of sand, rocks, construction debris from when the house was built. A few of the sections have penetrations already for faucets, venting, electrical, A/C, etc.
- The open space above the concrete is ~4 inches high.
- The sub-floor seen is the primary living area.
- At the back of the rim-joist is another 2x8 and stucco exterior. No further insulation.
Should I remove the boards and sand to do this, or leave them as-is and insulate over the wood?
What is my best bet for insulating this?
Those Rim-Joist cavities look like this once cleaned out: