R-Value
A measure of thermal resistance — how well a material resists heat flow. Higher R-values mean better insulation. Recommended attic R-values range from R-38 to R-60 depending on climate zone.
Why It Matters
Adding insulation from R-19 to R-49 in your attic can reduce heating costs by 10-15%. R-value requirements are specified by climate zone in building codes.
Real-World Example
Related Topics
Related Terms
Air Sealing
The process of identifying and sealing unintentional air leaks in a building envelope — including gaps around pipes, wires, ducts, windows, and the attic hatch.
Blower Door Test
A diagnostic test that uses a calibrated fan mounted in an exterior doorway to depressurize the house and measure the total air leakage rate, expressed in CFM50 or ACH50.
ENERGY STAR
A U.S. EPA/DOE program that certifies products meeting energy efficiency standards above federal minimums. ENERGY STAR products use 10-50% less energy than standard models.