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Green Building Architect George Ostrow takes us through a comprehensive and environmentally friendly addition to a 1980 Seattle home. In addition to renovating the original home, Ostrow added a spacious in-law apartment by its side, connected at the top by a row of windows to create an atrium-like walkway beneath. The non-structural components of the original home were removed and replaced with modern, energy-efficient materials, while the in-law suite was built green from the ground up. The addition sits on environmentally friendly insolated concrete forms (ICFs) piped with PEX tubing, and the shell is formed from structural insolated panels (SIPs) and oriented strand board (OSB), which all help to save energy and prevent heat loss. Finally, fiber-cement siding and salvaged interior trim put the finishing touches on these cost-saving, energy-efficient twin homes.
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