What is the highest R value for a 2×6 wall?
The installed insulation R–value for 2×6 fiberglass batt ranges between R-19 and R-21. When blown or sprayed cellulose insulation is used, the R–value is typically R-20 for 2×6 walls.
Then, What is the best insulation for 2×6 walls?
Insulation for 2×6 Walls
Use R-19 or R-21 kraft-faced fiberglass insulation for two-by-six (2×6) walls. This combination ensures that the insulation is neither too loose nor too tightly packed within the walls.
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