Abstract: A log for use in log construction is disclosed. The log comprises upper and lower, opposed major faces, a surface adapted to be an exterior, vertically extending surface in such a log construction, cooperating means provided on the upper and lower major faces for aligning a stack of plurality of such logs in a substantially vertical array and a flange comprising interior and exteriors surfaces adapted to be substantially vertically oriented in such a log construction. The flange is connected to and depends downwardly from the lower major face and is positioned so that its exterior surface constitutes an exterior surface in such a log construction. A channel surface is provided on the log, adjacent to the upper major face, and is adapted to be oriented substantially vertically, in such a log construction, opposite the interior surface of a flange of a corresponding log stacked on top of the log and forming therewith a channel.