Abstract: A building wall comprising the plurality of stacked logs with flat top and bottom surfaces into each of which is cut a deep slot. A metal bar is received in the aligned slots of vertically adjacent logs and pointed projections penetrate into the wood of the logs to prevent separation. In one embodiment, the projections are spaced clusters of downwardly extending nails which prevent separation of logs placed end to end and upwardly extending nails which prevent shear movement of adjacent logs. In another embodiment, the bar has sharp projections which are punched from the surface thereof to be received in the aligned slots of adjacent logs and penetrate a side wall of said slot.

Abstract: A building log comprising a length of timer with essentially planar top and bottom surfaces interrupted by a pair of parallel tongues running along and near the edges of the top surface, and a complementary pair of grooves running along the bottom surfaces so that stacked logs are interlocked. A segment adjacent the end of the log is cut away at top, and bottom and both sides to a reduced cross-section, so that similarly reduced sections of cross loop may be received in nested relationship. The cuts to the reduced cross section on each sides is at a 45.degree. angle.

Abstract: A wood log of substantial thickness and having flat top and bottom surfaces interrupted by complementary tongues and grooves along the length thereof. One or more slots open from at least one of the surfaces with the total slot depth extending over all but a small portion of the top to bottom thickness of the log. The slots are filled with an insulating material.