Insulation Applications and Comparisons


The primary purpose of thermal insulation is to control heat trans­fer through the exterior assemblies of a house. The thermal envelope of the home is considered to be the exterior perimeter where an energy breach may occur. This last line of defense, where heat gain or heat loss can occur, is not to be taken for granted. In fact, to guar­antee the comfort of the occupants and the energy efficiency and durability of the home, the thermal barrier, or insulation, and the air barrier should form a continuous envelope around the house. All components of the air and thermal barriers must be in physical contact with each other to prevent any inferior or omitted element from getting within the envelope. Improperly installed materials, inferior-quality materials, or omitted areas will compromise the effi­ciency of a homeowner’s heating and cooling system.