Cordwood masonry, otherwise known as stackwall construction is a method of building walls whereby log ends are stacked with a mortar mix between them. The round log ends protrude slightly from each side of the wall and look like a stack of firewood. The method may be used as infill or may be load bearing itself, in which case the walls tend to be quite thick. Such walls may be insulated by leaving a continuous cavity between the exterior and interior mortar. Sawdust mixed with lime is most commonly used for insulation, though the R value depends upon the relative dimensions of the various components of the wall. Peeled and dried softwood logs of varying diameters are left untreated and the building is said to breathe. In wet climates large overhangs are recommended and the lowest log ends are kept well up off the ground to prevent rot. Some cordwood masonry buildings are circular, but we prefer square corners and use the Lomax corner design.