Guide 18: Insulation

 

Insulation is used primarily to reduce the rate of heat transfer from areas of high temperature to those at a lower temperature. The ability of a material to slow this movement of heat is referred to as its thermal resistance or R-value. Insulation materials are rated based on this R-value; the higher the R-value the longer it takes for heat to move through the material. In cold weather insulation retains the heat within the house; in warm weather it reduces the rate at which the exterior heat moves to the cooler interior. Insulation affects all three modes of heat transfer - conduction, convection and radiation.

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