A technique for constructing timber buildings in which longitudinally split logs were either set in the ground, curved side out, or fixed to a horizontal wooden sill beam to form a wall. The top of the upright staves would have been tied to the sill and to a wall plate by mortice and tenon joints; in some cases the staves were slotted together with tongue and groove joints. Corner posts may have been given extra strength by using whole unsplit logs. In many cases the interior wall surfaces were plastered to conceal the timberwork. The technique of construction was common in Scandinavia, especially for church building, from at least the 9th century, and was probably widely used in northern Europe during the late 1st millennium ad.