The roof is supported on posts tenoned into a beam. The carpentry is refined&colon; purlins and ridge are tenoned into the trusses. The horizontal timbers are tenoned into mortises chiseled into the posts. The four corner posts are tenoned into interlocking sill logs. The mortised and tenoned and pegged beams are arranged in "H-shaped" units. The building consists partly of mortise and tenoned hand-hewn and peeled log construction. The joints began to become bolted or nailed instead of being mortised and tenoned. Stone rings, tenoned into the wall at mid-court, appeared in the Terminal Classic era. Horizontal wood pieces (poles, beams, planks) tenoned into grooves in posts. The principal rafters of each truss are unusually shaped ('extruded') to receive the tenoned collar.