![Perhaps the most eco-friendly feature of the project is architect Mike Shively's preservation of the original structure. "I always believe in starting a project by identifying the best parts of what you have," he explains. "In this case [it was] the solid masonry construction and timber floor structure. I fired out all the perimeter walls and used spray foam insulation and Marvin windows to get a tight seal that keeps my heating and cooling costs low." Photo 1 of 8 in A Chicago Renovation Taps Into its Attic to Almost Double its Square Footage](https://images2.dwell.com/photos/6063391372700811264/6133587188136062976/original.jpg?auto=format&q=35&w=160)
A Chicago Renovation Taps Into its Attic to Almost Double its Square Footage
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Perhaps the most eco-friendly feature of the project is architect Mike Shively's preservation of the original structure. "I always believe in starting a project by identifying the best parts of what you have," he explains. "In this case [it was] the solid masonry construction and timber floor structure. I fired out all the perimeter walls and used spray foam insulation and Marvin windows to get a tight seal that keeps my heating and cooling costs low."