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The ability of insulation to restrict heat flow is measured by its R-value. The R-value of insulation depends on the type, material, and thickness of the insulation. Higher R-values indicate greater resistance to heat flow and thus better insulation.
The EPA and Department of Energy have published recommended insulation R-values based on what part of the United States you live in (included on the right). For the Dallas area (zone 3), they call for at least a total of R30, up to R60. The table at the bottom right gives the approximate R-value per inch of depth for several types of insulation.
Most homes are built with an eye toward cutting costs, not maximizing energy efficiency. As a result, if you have not already had insulation added, your home probably has R19 or less.
If you have less than R30, you are below recommended values and are using more energy to air condition your home than you could be. If you have less than R60, adding more insulation would make your home even more energy efficient! -
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