as little as 8 inches of thickness may suffice. According to the DOE, 8 inches of high-density batt insulation will provide around an R-30. Likewise, 9 1/2 inches of regular batt insulation will ...

Insulation is measured by its thermal resistance, or R-value, which measures the material's type, thickness, and density ...

Inspect and measure the thickness of any insulation you find there. It will most likely be a fiberglass batt, so multiply the thickness in inches by 3.2 to find out the R-value (or the R-value might ...

To get the most R-value with the least thickness, use batt insulation with higher R-value per inch in combination with rigid foam insulation. Rigid foam sheeting has an R-value ranging from R-5 to ...