Insulation type, whether for attics or walls, and the material it is made from determine the R-value of the installation. The R-value measures how well the insulation resists the flow of heat, explains Today's Homeowner.... More »

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The insulation type with the highest R-value per inch is polyisocyanurate structural insulated panels, which has R-values ranging from 5.6 to 7.7 per inch, according to HouseLogic. Closed-cell polyurethane spray foam als... More »

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Numerous types of insulation, including blanket, concrete block, foam board, loose fill and sprayed foam, are available as of 2015. Each type of insulation comes in a variety of R-values, which measure the insulating mat... More »

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The R-value of insulation is calculated by determining how a certain thickness of material resists heat loss given temperature differences over time, according to the Cellulose Insulation Manufacturers Association. The h... More »

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An insulation R-value chart refers to a table that lists the levels of insulation recommended for different climates and for different areas in the home, according to Energy Star. Some R-value tables detail the specific ... More »

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Commonly used fiberglass batt insulation has an R-value in the range of R-2.9 to R-3.8 for every inch of thickness. High quality batt can have an R-value between R-3.7 to R4.3 per inch. The exact R-value for batt insulat... More »

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To calculate the R-value in insulation, determine the R-value of the specific insulating material. For multilayer installations, determine the R-values of each layer, and add the values together to get the total R-value ... More »