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Insulation is measured by its thermal resistance, or R-value, which measures the material's type, thickness ... walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and ...

Insulation is measured by its thermal resistance, or R-value, which measures the material's type, thickness ... It commonly involves fiberglass batts, which look like pink or yellow fluff strips ...