Concord Four Square
Built in 1916, the 1,500 square foot Concord Four Square retrofit features an upgraded mechanical system as well as a super-insulated and airtight enclosure. Closed cell spray foam insulation installed to the interior of the foundation wall and the underside of the roof deck increases the home’s airtightness while providing a component of the high performance thermal enclosure. Cavity insulation, rigid foam insulation on the walls, roof and under the new basement slab and high performance windows complete the thermal enclosure.