saddle
To cut a saddle-shaped notch in (a log or other piece of wood) so it can fit together with other such logs or pieces; also, to fit (logs or other pieces of wood) together with this method.
saddle: notching logs to sit flush at corners
To saddle is to cut a curved or V-shaped notch into the top of one log so it can sit securely on the round or irregular surface of another log below it. The notch is cut to match the profile of the supporting log, allowing the upper log to nest down and rest stably. This is a core joinery method in log construction, particularly in log cabin building, where round logs must be fastened at corners without sliding or rocking.
The notch itself is typically cut on the underside of the upper log. The cutter scribes or marks the outline of the log beneath onto the top surface of the log to be notched, then removes wood along that line. The depth of the saddle is usually about one-third the diameter of the log. A well-cut saddle creates a mechanical lock that resists both vertical settling and horizontal displacement, especially critical at corners where the structure bears load and weather stress.
Variations and technique
Saddle notches come in two main forms: the round saddle, which follows the cylindrical shape of the supporting log, and the V-notch, which cuts a sharper V-groove. Round saddles demand more careful hand work or power tool setup, while V-notches are faster to cut but create less contact surface. Modern log builders often use a chainsaw to rough the notch, then hand tools or angle grinders to refine the fit. The fit must be tight enough to prevent settlement but not so tight that forcing logs together causes checking or splitting.
Poor saddling leads to gaps at corners, water infiltration, and uneven settling that cracks chinking and compromises the weather seal. Over-tight notches can split the upper log during assembly or cause the structure to rack (twist) unevenly as wood seasons. The term saddle derives from the visual likeness to a saddle seat that cups the back of a horse, cradling rather than gripping.
Saddling competes with other corner joinery methods such as butt-and-chink (where logs simply meet end-to-end with filler) and dovetail or Scandinavian notches, which lock logs more securely but demand more skill. Saddle notching remains popular in owner-built and heritage log work because it is forgiving of irregularities in log diameter and can be executed with hand tools if necessary.