More insulation per unit area, plus air highness = super energy efficient home

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Spray-foam insulation literally seals every little nook and cranny in the walls and adds R 6.5 per inch to boot. The Landmark homes are now so tight they experience only 0.4 air exchanges per hour, which saves a lot of energy. Photo David Dodge

Spray-foam insulation literally seals every little nook and cranny in the walls and adds R 6.5 per inch to boot. The Landmark homes are now so tight they experience only 0.4 air exchanges per hour, which saves a lot of energy. Photo David Dodge