True North Log Homes manufactures the best-engineered log homes. At the heart of their technology is the patented Keylock Air Seal Corner®, which has revolutionized log home construction. This joinery system is what distinguishes a True North log home from every other. The absence of nails, screws or lag bolts in the True North joinery system is the trademark of this superior construction method. They are the only log home company willing to offer a 25-year warranty against air infiltration.