Traditional House in Jeju, South Korea

Especially on Jeju Island,in South Korea where volcanic rock and strong winds are abundant, homes traditionally consisted of a double wall system with an exterior wall of volcanic rock surrounding an interior wall, creating a protected corridor around the house. This in turn, protected the interior walls from wind and rain and improved the thermal performance of the home. Also because of the strong winds, thatched roofs were generally secured by a net of straw ropes.