Cob can create structural bearing walls, even for two stories, or it can be used in combination with a post-and-beam framework. In rainier climates, a post-and-beam method allows the roof to be built before the walls, creating a protected work space. The walls can be finished with a breathable plaster (cement plaster is out since it doesnt breathe) to both protect the exterior and reduce dust inside. And cob is an eminently