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ICF R-Value: What the Label Says, What the Wall Does, and Why an R-22 ICF Wall Outperforms an R-22 Frame Wall
A standard ICF block with about 2.5 inches of EPS foam each side carries a nominal R-22 to R-24; thicker-panel blocks reach R-26 to R-30. Because the foam is continuous with no studs, plates or headers through it, the effective value is nearly the same as the nominal, where a 2x6 wall with R-22 batt
