AFT Insulation – Understanding R-Value

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Insulation types and materials have a significant impact on R-value, a measurement of heat transfer resistance through the material. The higher the R-value, the more resistance and less thermal transfer. The R-value of a particular insulation is determined by its thermal properties, including conductivity and specific heat capacity, as well as its thickness.

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Often, insulation will be installed with an air barrier, vapor barrier and/or radiant barrier. These facings are commonly made of kraft paper, white vinyl sheeting or aluminum foil. The type of facing used will depend on the climate, where and how the insulation is installed in your home, and what you want your home to look like.

In physics, the thermal resistance of an insulated material behaves much like electrical circuit resistance. For this reason, the R-value of a material can be calculated by adding up all its individual resistances in series and multiplying them by the fixed potential (voltage) between the ends of the system.

Some insulating materials, such as vacuum cellulose, aerogel and polyurethane foams, have the highest R-value per inch of material. Other materials, such as cotton batting and fiberglass (both blown and batt) have a lower R-value per inch. In addition, the thermal properties of some insulating materials decrease when they are compressed.

AFT Insulation
62 Lighthouse Ln, Westport, MA 02790, United States
(774) 458-9833

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