The best materials for rim joists insulation include spray foam, rigid foam boards, and fiberglass insulation. Spray foam is highly effective because it seals gaps, blocks air leaks, and prevents moisture infiltration. Rigid foam boards offer excellent thermal resistance and are easy to install in tight spaces. Fiberglass insulation is another option, though it works best when paired with an air barrier to improve efficiency. Choosing the right material depends on your home’s specific needs, energy goals, and budget, ensuring maximum comfort and energy savings.
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