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R-Values. An insulating materials resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value -- the higher the R-value, the greater the insulating effectiveness. The R-value depends on the type of insulation, its thickness, and its density.
R-Value Table - English (US) Units MaterialR/ Inch hrft2F/BtuR/ Thickness hrft2F/BtuSoft Wood Lumber1.252 nominal (1 1/2)1.882x4 (3 1/2)4.382x6 (5 1/2)6.8861 more rows Jul 16, 2019
Recommended insulation levels for retrofitting existing wood-framed buildings ZoneAdd Insulation to AtticFloorIf your attic is uninsulated1R30R132R49R133R49R194 more rows
R-19 to R-21 is generally considered a well-insulated exterior wall. Achieving an R-21 rating in a 2x4 wall is simpler when the wall is first being constructed so you dont need to add more insulation later on.
R-value is a metric that tells us how well insulation performs at reducing heat loss. When comparing R13 to R15, insulation designated as R15 performs better at reducing heat loss than R13. R-values are generally cumulative, meaning that you can stack two layers of R6 insulation boards to achieve R12.

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Fiberglass and rock wool batts2x4 walls can hold R-13 or R-15 batts; 2x6 walls can have R-19 or R-21 products. Generally, batt insulation is the least expensive wall insulation material but requires careful installation for effective performance (see page 4).
R-Value Chart for EnerfoilTM Rigid Foam Faced Insulation Thickness (Inches)R-value (in I-P/Imperial)RSI (R-value in Metric)2.012.42.162.515.52.73.018.63.243.521.73.786 more rows
ing to the U.S. Department of Energy, R-values for exterior walls in colder climates should be at least R-13 to R-23. In milder climates, a lower R-value may be sufficient. For example, in a moderate climate, an R-value of R-13 to R-15 is typically recommended.

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