3D model: Meji-tsukikake-awase-tsugi by thejoinery on Sketchfab
Assembly insights
This joint maintains alignment across intersecting beams while distributing load across broad faces, ideal for modular structures assembled without metal fasteners. Mechigai Tsugi locks two members at right angles through interlocking tongues and grooves—a cross-lap that resists separation in both directions and keeps frames square during assembly.
Historical context
Mechigai Tsugi (cross-lapped joint) is one of the foundational shiguchi used in gate construction, garden pavilions, and interior framing. The name refers to the crossed tongues (mechi) that interlock at the intersection. Because it requires no nails or screws, it suits structures that must be disassembled or rebuilt, including temporary festival architecture and modular garden buildings.
Construction steps
- Mark the crossing point on both beams; scribe half-lap depths with a marking gauge.
- Lay out the interlocking tongue and groove profiles at the intersection.
- Saw the half-lap faces, then chisel the tongues and grooves to match.
- Test-fit; both members should sit flush at the intersection with no play.
- Assemble remaining frame members; the joint resists racking when the frame is complete.
Where to see this joint in Japan
- Traditional gates (mon) — Temple and shrine precincts throughout Japan
- Garden pavilions and tea arbors — Kyoto gardens and historic estates
Variations
Lap depth is typically half the member thickness but can be reduced for lighter work. Some versions add a peg through the intersection. Shachi Sen (half-lap at corners) is a simpler variant without interlocking tongues.
Applications
- Gate structures
- Interior frames
- Garden pavilions
Tools required
- Marking gauge
- Chisels
- Dozuki saw