Homes being constructed today are more energy-efficient than those built even just a few years ago, primarily due to significant improvements in building products and techniques, as well as development of high-performance heating and cooling systems and other appliances.
At InterNACHI, we believe that the benefits of foundation insulation are often overlooked. Heat loss from an uninsulated, conditioned basement may represent up to 50% of a home's total heat loss in a tightly sealed, well-insulated home.
Foundation insulation is used primarily to reduce heating costs and has little or no benefit in lowering cooling costs. In addition to reducing heating costs, foundation insulation increases comfort, reduces the potential for condensation and corresponding growth of mold, and increases the livability of below-grade rooms.