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Kumiko Panel

Build a Japanese Geometric Lattice Panel

Build a 6-inch asanoha kumiko panel — Japanese friction-fit joinery with no glue or nails. Strip milling, grid construction, and infill fitting.

For: Intermediate woodworkers ready to try their first piece of traditional Japanese joinery

31 min read15 sources12 reviewedUpdated Apr 26, 2026

How to Use This Guide

Kumiko rewards patience and penalizes shortcuts. This guide builds the asanoha (hemp leaf) pattern — the most recognized kumiko design — in a 6" × 6" panel. That's the right scope for a first project: enough pieces to learn the technique, small enough that error doesn't compound into frustration.

If you're new to kumiko entirely: Read Part 1 first. The geometry is counterintuitive until you see it laid out.

If you've built a plain grid before: Jump to Part 5: Fitting the Asanoha Infill.

If something isn't fitting right: Go to Common Mistakes before you force anything.

Kumiko Panel at a Glance

A kumiko panel is a Japanese geometric lattice where thin wood strips interlock through friction — no glue, no nails. The asanoha pattern (hemp leaf) is built from a square grid filled with angled pieces at 22.5°, 45°, and 67.5°. The whole technique depends on one thing: every strip must be the same thickness.

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KUMIKO PANEL — QUICK OVERVIEW 5 × 5 GRID — 25 SQUARES × 7 infill pieces = 175 total STRIP SIZE 1/2" wide × 1/8" thick TOLERANCE Under 0.005" thickness variance across all strips INFILL COUNT 7 pieces × 25 squares = 175 total BEST WOOD Basswood (beginner) — hinoki (traditional) JOINERY Friction-fit half-laps — no glue, no nails
A 6" kumiko panel uses a 5×5 foundation grid. With 7 asanoha infill pieces per square, that's 175 pieces total — most project time is in the fitting phase. The highlighted center square marks one complete cell.
OriginJapan, Asuka period (538–710 CE)
Panel size (first project)6" × 6" square
Strip dimensions1/2" wide × 1/8" thick
Best beginner woodBasswood (traditional: hinoki)
FastenersNone — press-fit friction joints
Infill count7 pieces per grid square

In this guide:

Part 1: What Makes Kumiko Work

Kumiko joints hold because thin wood compresses slightly at contact surfaces. Press two 1/8"-thick strips together with notched intersections and the wood fibers at the joint compress just enough to create friction — enough to hold under normal handling, firm enough to resist accidental disassembly. No adhesive, no mechanical fastener.

What makes this possible: every joint in the panel acts together. The multi-directional interlocking means no single joint carries load alone. Pull on one piece and every surrounding piece resists. The assembly becomes stronger as it gets larger — the opposite of a single glue joint, which is only as strong as its glue line.

The critical requirement: every strip in the panel must be the same thickness. A variance of 1/64" (0.015") is enough to create joints that won't seat or sit sloppy. That's the bar.

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ASANOHA ANGLES — THE GEOMETRY 22.5° + 45° + 22.5° = 90° These three angles tile every grid square completely — no gaps, no overlaps 7 PIECES PER GRID SQUARE (1 + 2 + 4) 1× Long Diagonal 45° cuts on both ends — spans corner to corner across the full cell 2× Short Fillers 67.5° on the wide end, 22.5° on the narrow — fill the triangular spaces beside the diagonal 4× Locking Pieces 45° on both ends — shorter than the diagonal; press in last and lock the full square
The asanoha angles (22.5° + 45° + 22.5°) are geometric, not tradition — they perfectly tile a 90° corner. Every grid square takes 7 pieces: 1 long diagonal, 2 short fillers, and 4 locking pieces that press in last.

Why the asanoha angles are what they are

The asanoha pattern starts as a square grid. Each grid square gets subdivided by a diagonal running corner to corner (45°). That diagonal gets bisected again: 45° ÷ 2 = 22.5°. The angle complementary to 22.5° within 90° is 67.5°.

So: 22.5° + 45° + 22.5° = 90°. The three angles tile the grid square perfectly, with no gaps and no overlap. That's why these specific numbers — they're not arbitrary tradition, they're geometry.

Each grid square in the finished asanoha panel requires 7 infill pieces:

  • 1 long diagonal (45° on both ends)
  • 2 short fillers (67.5° on one end, 22.5° on the other)
  • 4 tiny locking pieces (45° on both ends, shorter than the long diagonal)

For a 6" panel with 1" grid spacing: 5 × 5 = 25 squares × 7 pieces = 175 infill pieces. Count before you start — it helps set realistic expectations for how long the infill phase takes.

Part 2: Choosing Your Wood

Use basswood. It's the right material for a first kumiko project and the consensus recommendation among English-speaking practitioners.

MEK Woodworks' kumiko guide uses basswood exclusively and explains why: small, even pores produce a smooth planed surface; consistent density means no hard/soft alternation like pine's growth rings; it compresses at joints just enough for reliable friction fit without crumbling. It's also inexpensive and available at Rockler, Woodcraft, and most lumber yards.

Traditional Japanese kumiko uses hinoki (Japanese cypress) and sugi (Japanese cedar). Both have tight, straight grain and exceptional dimensional stability. They're available through specialty importers in the US at 4–6× the price of basswood. Worth it eventually — not worth it for learning the technique.

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WOOD SELECTION FOR KUMIKO STRIPS BASSWOOD BEST FOR BEGINNERS WORKABILITY Excellent — even, forgiving GRAIN STABILITY High — use quartersawn BEGINNER EASE Very high — first choice HINOKI TRADITIONAL CHOICE WORKABILITY Excellent — top-tier GRAIN STABILITY Very high — tight grain BEGINNER EASE Low — hard to source PINE AVOID WORKABILITY Poor — inconsistent rings GRAIN STABILITY Low — cups at 1/8" BEGINNER EASE Very low — skip it MAPLE JIGS ONLY WORKABILITY Difficult — too hard GRAIN STABILITY Good — but overkill BEGINNER EASE Low — for angle jigs
Basswood wins on all three counts for a first panel. Hinoki is the traditional choice but hard to source in the US. Pine's inconsistent growth rings cause workability problems at 1/8" thickness. Maple is excellent for angle jigs but too hard for the strips themselves.

Grain orientation is non-negotiable

Use quartersawn or riftsawn stock. Check the end grain: growth rings should run perpendicular to the face (not parallel to it). At 1/8" thickness, flat-sawn strips cup unpredictably as humidity changes. Joints that were tight when you cut them go loose when the strip edges lift. Big Sand Woodworking's strip-making guide calls this out specifically: "rift or quarter sawn" stock is essential, with "straight even grain so that the kumiko being ripped from the blanks will likewise have nice straight quiet grain."

What to avoid

WoodWhy to avoid
PineInconsistent density — soft early wood and hard late wood plane and pare differently
Oak or walnutToo hard for hand-fitting thin cross-grain infill cuts; splits risk on short-grain ends
Mixed speciesDifferent expansion rates loosen joints seasonally

One species per panel. Mixing basswood with something contrasting might look attractive in theory — in practice, the differential wood movement works against the friction fit.

Wood comparison

WoodAvailabilityWorkabilityCostVerdict
BasswoodWideExcellentLowBest for beginners
HinokiSpecialty importersExcellentHighTraditional; worth it later
PineWidePoorLowAvoid — inconsistent
MapleWideDifficultMediumGood for jigs, not strips

Part 3: Milling Your Strips

Every problem in kumiko traces back here. Strips that vary in thickness create joints that either won't seat or sit loose. Get this phase right and the rest follows.

Target dimensions:

  • Width: 1/2" (12–13mm)
  • Thickness: 1/8" (3mm)
  • Length: cut slightly over your panel dimension; trim to exact length with a stop block later

Acceptable thickness variance: under 0.005". Check with digital calipers. Reject anything outside that band before you cut a single notch.

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STRIP MILLING SEQUENCE STEP 1 RIP TO 5/32" Bandsaw preferred — safer than table saw at this width Rip at 5/32" — slightly over the 1/8" target leaves 1/32" for the planing step → STEP 2 PLANE TO 1/8" Use a thicknessing jig: 1/8" groove sets the depth stop Plane both faces to the jig Sharp blade — light passes flip strips between passes → STEP 3 VERIFY Measure every strip with digital calipers Target: under 0.005" variance across all strips reject & re-plane if over spec One out-of-spec strip causes joint failures across the entire panel — measure before cutting any notch
The milling sequence: bandsaw roughing, thicknessing jig, then calipers. The thicknessing jig (a routed groove equal to your target thickness) is the key — it makes every strip the same height regardless of technique variation.

Ripping your strips

Use a bandsaw rather than a table saw. At 1/8" thickness, thin strips on a table saw are a kickback risk. The bandsaw leaves a rougher surface (which you'll plane away) but wastes less wood and handles narrow stock more safely. Rip at 5/32" — slightly over your 1/8" target — to leave material for the planing step.

Thicknessing the strips

Make a simple thicknessing jig: rout a 1/8"-deep groove in a scrap of stable MDF or dense hardwood. The groove width matches your strip width (1/2"). Lay strips in the groove and plane the face flush to the jig surface — the groove acts as a depth stop.

Big Sand Woodworking describes the sequence: start with a coarser plane setting to remove the bandsaw marks quickly, then switch to a fine setting for the finished surface. Flip strips 180° between passes so you're planing both faces to the same reference.

A Japanese hand plane (kanna) produces a better surface than a Western bench plane for this work — the blade geometry is better suited to end-grain-adjacent cuts on thin stock. A sharp, well-tuned Western plane also works. The key is sharp: a dull blade on 1/8" stock causes tearout that's hard to recover from.

Part 4: Building the Foundation Grid

The grid is the structural skeleton. Every infill piece sits in a grid square, so if the grid is out of square or has inconsistent spacing, the infill won't fit regardless of how precisely you cut it.

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THREE-LAYER INTERLOCKING GRID MIDDLE STRIPS shallow notch — 3/16" 3/16" Notch from top face One-third of strip width TOP / BOTTOM STRIPS deep notch — 5/16" 5/16" AT THE INTERSECTION strips seat flush when notched correctly seated crossing strip slots up into the shallow notch deep notch THE FLUSH RESULT 3/16" + 5/16" = 1/2" strip width flat top surface Top faces align perfectly because the two notch depths add up to the full strip width 3/16" + 5/16" = 1/2" one strip width ✓
The three-layer system: middle strips use a shallow notch (3/16", one-third of strip width) while top and bottom strips use a deep notch (5/16", two-thirds). At every intersection, the two depths add to exactly 1/2" — the full strip width — so all faces sit flush.

How the three-layer system works

A kumiko grid isn't simply two directions of strips crossing. It's a three-layer interlock: bottom strips, middle strips, and top strips all in the same plane. The bottom and top strips have deep notches (2/3 of the strip width); the middle strips have shallow notches (1/3 of the width). When assembled, the three layers sit flush to each other, creating a flat grid.

From Jim Guilford's detailed build notes, the notch proportions for 1/2"-wide strips:

Strip typeNotch depthWhy
Middle strips~3/16" (just over 1/3 of 1/2")Shallow — lets top/bottom strips pass over
Top/Bottom strips~5/16" (just over 2/3 of 1/2")Deep — locks middle strips in place

The "just over" matters: wood compresses when the joint seats, so cutting to exactly 1/3 or 2/3 often results in joints that spring back slightly loose. Leave the extra thousandths and test-fit.

Cutting the notches

With a table saw crosscut sled: Use a stop block to position every notch identically. The blade kerf width becomes the tenon width — full-kerf (1/8") and thin-kerf (3/32") blades both work; be consistent within a panel.

By hand: Mark with a sharp marking knife and square. A Japanese dozuki saw gives the cleanest kerf. Pare cheeks with a sharp 1/4" chisel to final fit.

Test-fit pairs of strips as you cut — don't cut all the notches in all the strips before checking fit. One misset stop block ruins your whole blank.

Assembling the grid

Dry-fit everything first. Lay out all strips, press them together, check for square with diagonal measurements (diagonals must be equal). The grid should hold its shape under light handling before you commit. If it's sloppy, the problem is strip thickness — go back and re-measure.

For a display panel with no frame: press-fit only, no glue. The friction holds. For a panel that will get handled often, tiny dabs of glue at intersections add permanence without changing the technique.

RELATED: Mortise and Tenon Joinery The half-lap grid uses the same principle as mortise-and-tenon: wood-to-wood contact, consistent thickness, clean mating surfaces.

Part 5: Fitting the Asanoha Infill

This is where kumiko earns its reputation for patience. Work one grid square at a time, in sequence. Don't batch-cut all the infill pieces before you've tested the first square.

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ASANOHA INFILL — ASSEMBLY ORDER STEP 1 — 1 PIECE Long Diagonal 45° both ends spans corner to corner → STEP 2 — 2 PIECES Short Fillers 67.5° wide end 22.5° narrow end → STEP 3 — 4 PIECES Locking Pieces 45° both ends press in last — locks square → COMPLETE — 7 PIECES Square Done 1 long diagonal + 2 short fillers + 4 locking pieces = 7 total move to next square
Always fit the long diagonal first — it establishes the reference. Short fillers seat against the diagonal. Locking pieces go in last and freeze the full assembly. Complete one square before starting the next: each square's fit informs the next cut.

Your angle jigs

You need three guide angles: 22.5°, 45°, and 67.5°. Make these from dense hardwood (maple or oak) or buy commercial blocks from Lee Valley, KumikoLab, or RBT Tools.

From RBT Tools: jig blocks measure roughly 50mm × 45mm with a central groove 8mm deep × 12mm wide — matching your strip dimensions. For efficiency, make two blocks: Block A with 45° on one face and 67.5° on the other; Block B with 22.5° on one face and 67.5° on the other. This covers all four required cuts.

The seven pieces

Per grid square, in order of assembly:

  1. Long diagonal (1 piece): 45° cuts on both ends, length = square diagonal
  2. Short fillers (2 pieces): 67.5° on the wide end, 22.5° on the narrow end
  3. Locking pieces (4 pieces): 45° on both ends, shorter than the long diagonal

Fitting sequence

Work each square completely before moving to the next:

Long diagonal first. Cut slightly long. Test in the grid square. If it won't seat, pare the angled end with a sharp chisel — take off a few thousandths at a time. The piece should slide in with firm, even finger pressure. A mallet means the piece is too long.

Short fillers next. Use the 67.5°/22.5° jig. The narrow end (22.5°) is the fragile end — pare carefully from the wide end to avoid breaking the tip. Test each piece before cutting the pair.

Locking pieces last. These press into the remaining triangular spaces and lock the entire square's assembly. When a locking piece seats correctly, the surrounding pieces stop moving. That's the tell.

When nothing will seat: Check that the long diagonals are genuinely crossing at their centers — they should share a half-lap of their own at mid-length. If they're not sitting flat on each other, the grid squares may not be sized consistently.

When the grid warps as you press infill: The piece is too tight. Pare it slightly rather than forcing it. Forcing propagates stress through the whole panel.

Part 6: Finishing Your Panel

Traditional kumiko is unfinished. Japanese masters let hinoki develop its own patina over years of handling. The pale wood, the shadow lines in the pattern, the crisp tool marks — the finish is the wood itself.

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KUMIKO FINISHING OPTIONS NO FINISH RECOMMENDED — TRADITIONAL Why it works: Wood develops natural patina Sharp tool marks stay crisp Shadow geometry reads clearly Friction joints unaffected Best for: Display panels, wall art, decorative screens Traditional Japanese approach — let the wood speak THINNED SHELLAC OPTIONAL — LIGHT PROTECTION How to apply: Apply to strips before cutting joints Wipe on, dry, sand 320-grit lightly Joint cutting freshens mating surfaces Wipe assembled faces only — no pooling Caution: Wipe off immediately at intersections Film at joints obscures geometry Blonde shellac — use 1lb cut (very thin) OIL OR FILM FINISH AVOID BOTH Why oil fails: Wicks into joints during application Softens wood while curing Loosens friction fit permanently Why film finish fails: Builds at intersections Visually flattens shadow geometry Makes the work look plastic Polyurethane, lacquer, wipe-on poly — all avoid
The default for kumiko is no finish — the shadow geometry and crisp tool marks are the visual. If you want light protection on basswood, thinned shellac applied before cutting joints is the only safe option. Oil and film finishes both damage the friction-fit joints.

If you want light protection on a basswood panel, use thinned blonde shellac. Apply it to the strips before cutting the joints — wipe it on, let it dry, sand lightly with 320-grit. The joint-cutting that follows freshens the mating surfaces, so the friction fit isn't affected. After assembly, a second very light wipe on the faces only. Wipe off any shellac that pools at intersections immediately — film buildup in the joints obscures the geometry.

Avoid oil. Oil wicks into joints and takes a long time to cure. During curing, it softens the wood slightly — enough to loosen the friction fit on a panel that was perfectly tuned before finishing.

Avoid film finishes (polyurethane, lacquer). They build up at intersections and visually flatten the crisp shadow geometry that makes kumiko worth making.

Part 7: Common Mistakes

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COMMON KUMIKO MISTAKES — CAUSES AND FIXES INCONSISTENT STRIP THICKNESS SYMPTOM: Joints won't seat OR sit wobbly CAUSE: Planing variation or dull blade FIX: Measure every strip with calipers — under 0.005" variance PREVENT: Use a thicknessing jig; check before cutting notches FLAT-SAWN STOCK SYMPTOM: Joints tight at first, go loose as humidity changes CAUSE: Growth rings run parallel to face — strips cup FIX: Can't be reversed — remill from quartersawn stock PREVENT: Check end grain before buying — rings perpendicular to face FORCING INFILL PIECES SYMPTOM: Panel warps diagonally ("potato chip" warp) CAUSE: Piece too long — mallet used to seat FIX: Disassemble, identify the forced piece, pare it PREVENT: Firm finger pressure only — if you need more, pare first STARTING TOO LARGE SYMPTOM: Errors compound — panel becomes unusable CAUSE: 1/64" strip variance × 32 strips = disaster FIX: Build the 6" panel first — three or four times PREVENT: Earn the larger panel — scale up after mastering the small one
Three of the four common mistakes trace back to the same root cause: strip thickness inconsistency. Flat-sawn stock, wobbly joints, and difficulty fitting all stem from the same source — get the milling right first.

Inconsistent strip thickness. The most common problem by far. Joints that refuse to seat or sit wobbly almost always trace back here. Measure every strip with calipers before cutting a single notch. Variance over 0.005" means re-planing or rejecting that strip.

Flat-sawn stock. Strips cup across their width as humidity changes. Joints that were tight go loose as the edges lift. Buy quartersawn material, or select quartersawn sections from wide flat-sawn boards and rip from there.

Forcing infill pieces. This causes the "potato chip" warp that Jim Guilford's build notes describe — the panel twists diagonally as compressed wood pushes the grid out of plane. Infill pieces should seat with firm finger pressure. If you need more force than that, the piece needs a little more paring.

Starting too large. Dimensional error compounds. A 1/64" inconsistency in strip thickness is barely noticeable on a 6" panel; it's a disaster on a 16" panel where that variance accumulates across 32 strips. Build the 6" panel. Build three or four of them. Then scale up.

Part 8: Variations and Next Steps

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KUMIKO PATTERN PROGRESSION PLAIN GRID START HERE Half-lap grid, no infill Beautiful on its own teaches strip consistency → ASANOHA (HEMP LEAF) THIS GUIDE ← YOU ARE HERE Grid + asanoha infill 7 pieces per square 22.5° + 45° + 22.5° angles → KAGOME (BASKET WEAVE) NEXT CHALLENGE Triangular grid — 60°/30° Less forgiving of errors build 3–4 asanoha panels first
The natural progression: plain grid teaches strip consistency and notch cutting, asanoha adds infill fitting at three angles, and kagome introduces a triangular grid system at 60°/30°. Don't skip the plain grid — it's a legitimate project, and it builds the foundation for everything after.

Start smaller: the plain grid panel

Before attempting the asanoha infill, build the grid alone. The half-lap grid with no infill is beautiful on its own — shadow lines at every intersection, the pattern of negative space. It's also a complete project that teaches strip consistency and notch cutting without the added precision demands of infill fitting.

Next pattern: kagome

The kagome (basket weave) pattern uses a triangular grid at 60°/30° angles instead of the 45°-based asanoha system. Same technique, different angle set. Build three or four asanoha panels before attempting it — the triangular geometry is less forgiving of inconsistency.

Frame options

A simple rabbeted frame in cherry or walnut makes the panel display-ready. The rabbet depth matches your strip thickness (1/8"); the frame depth should be at least 3/4" for visual weight. Cherry against pale basswood is a classic combination. Build the panel first; measure it; fit the frame to the finished panel, not the other way around.

RELATED: Dovetail Joint Dovetail joinery shares kumiko's demand for consistent layout and clean mating surfaces — skills that transfer directly.

Sources

Research for this guide draws on practitioner accounts, detailed build notes from woodworkers who've documented their process, commercial resource guides, and historical sources on Japanese joinery.

Wood Species

Basswood

Also Referenced

Marking KnifeCrosscut SledPineMapleCherryBlack WalnutOak

Tagged

Japanese TraditionQuartersawnHand CutWeekend

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