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What holds the house up since standard framing lumber is not used?

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Structural support is provided by the panel skins. Structural insulated panels use less wood than conventional framing, and it is optimally placed (as the panel skins), resulting in a wall assembly more than twice as strong as a conventional 2x4 wall. The 4-foot­wide panels, up to 24 feet long, are securely held together with plywood "splines" in both wall and roof systems.  more
winterpanel.com

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