How does the energy efficiency of a frame wrapped with SIPs or spray-foamed compare to conventional construction?

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SIPs and spray foam have several energy-saving advantages over standard construction methods. Their R values are at least 30-40% higher than fiberglass insulation of the same thickness, but this is only half the story. Their greatest energy-saving advantage over conventional framing and insulating is they create a seamless, insulated envelope around the timber frame.

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