Exterior insulation has the wall mass exposed to the interior, isolated from the exterior conditions by insulation. This improves the thermal mass effect, reducing the energy used to heat and cool. Integral insulation places thermal mass on both sides of the insulation, as does an insulated masonry cavity wall. Interior insulation isolates the mass from the interior, reducing the ability of the thermal mass to moderate the indoor temperature. In addition, recent studies of the thermal effect of mass exterior walls has shown that the location of the insulation in the exterior wall can have a significant impact. The mechanical, glazing and roof systems often have a greater impact of the energy used in the buildings. This point varies, depending on building type and location, and on insulation cost.įurthermore, although exterior walls play a significant, role in the overall energy performance of a building, they are but one of the elements in the building envelope. Beyond a relatively low insulation value in most climates, heating energy savings are outweighed by the extra costs of the insulation. As wall insulation (R-Value) increases, the energy savings benefits level out.
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