Timber frame joinery is a time-honored craft that relies on precision-cut connections secured by hardwood pegs, rather than metal fasteners. At its core lies the mortise and tenon joint—a tenon carved at the end of one beam fits snugly into a mortise, or rectangular hole, in another. Once aligned, a hardwood peg is driven through pre-drilled holes to lock the joint permanently.

The choice of peg material is critical. Hardwoods like white oak, locust, or hickory are preferred for their density, rot resistance, and shear strength. Unlike softwoods, these species compress slightly during driving, expanding to fill the hole completely. This creates a mechanical lock that tightens over time as the wood shrinks and swells with humidity changes.

Skilled joiners carefully angle and edge-bore the peg holes to draw the joint tight. The pegs are often driven with a mallet, then trimmed flush. Some craftsmen taper the pegs slightly to ease insertion while maintaining a tight fit. This method eliminates metal corrosion, reduces thermal bridging, and allows the frame to move naturally with the seasons.

Beyond function, hardwood pegs offer aesthetic continuity. The contrasting grain and color of oak pegs against a Douglas fir or pine frame becomes a visual signature of handcrafted work. Each peg, when driven, emits a resonant sound—a sign of proper fit. This tactile and auditory feedback connects the builder to centuries of tradition.

Modern timber framing still honors these ancient techniques. With careful joinery and the enduring strength of hardwood pegs, structures like barns, homes, and pavilions stand for generations. The craft is a testament to the harmony between wood, tool, and human skill.