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