The non-profit organization Habitat For Humanity has built another super-efficient house, which has received the highest LEED rating, LEED Platinum for homes. The 1,340 square foot, 3 bedroom and 2 bathroom, 1.5-story single family home, called the Westford House, is located in Westford, Massachusetts. The house has an estimated savings of roughly 40% over a similar more traditional home, which come to an estimated $1295 per year. The additional initial investment for making this home so efficient was $10,000.
What is most interesting about Westford House is that it achieved the highest LEED certification without any of the typical renewable energy features such as solar panels or wind turbines. This allowed the construction costs of the home to be kept at a minimum. The total construction costs of the home came to $175,000, proving that building an energy efficient home does not need to be very expensive.
The rafter framed unvented attic of the house features R-66 roof insulation, which is made up of unfaced fiberglass batt insulation (R-40) in rafter bay with two 2” layers of foil- faced polyisocyanurate insulating sheathing (R-26) on top of roof sheathing. The wall was assembled using a 2
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