With construction of the Cottage underway we wanted to share the steps taken to ensure energy efficient measures are implemented from the ground up. As this picture shows, even the slab foundation is insulated. An insulated foundation contributes to the home’s thermal envelope. Basically, if there isn’t a barrier between the earth and slab foundation, heat from the inside of your home can escape through the slab. According to the Department of Energy slab insulation can save $50-$60 annually, and that is calculated for homes in climates with mild winters. Although last winter was pretty mild, I would not call Sandpoint’s typical winter “mild”. But, for argument’s sake, let’s use the DOE’s figure – that 2″ piece of rigid foam alone can reduce your heating bill by $5 per month.