Keyaki: the gate wood

Keyaki, Zelkova serrata, is the wood of the gate: the great temple entrances, the street trees of old avenues, the figured boards of fine furniture. Where hinoki is pale and quiet, keyaki is warm brown and loud in the grain, with a flame figure that no finish can fake and no other common Japanese wood quite matches.

Hard, strong, figured

At around 700 kilograms per cubic metre dry, keyaki is a hardwood in fact and not just in name: it carries beams, wears well under foot, and holds an edge at the bench. It shrinks more than the softwoods in this index and must be dried with patience, but once dry it behaves like a wood that has nothing to hide. On the lathe it turns cleanly, which is why a turner bench that shows its cuts will often have a keyaki bowl or two in the rack, the figure doing half the work of beauty.

Where it belongs

The traditional uses were the visible, load-bearing ones: gate timbers, temple fittings, the top boards of chests and the bodies of fine furniture, and the massive keystone members of old roofs. Today the same logic applies to a table top, a stair tread, a handrail, anywhere a hard, figured surface earns its keep. As a street tree it still shades Japanese avenues, which is why the wood feels familiar even to people who never learned its name.

New stock and old stock

Old-growth keyaki is scarce and priced accordingly; most of what is offered now is younger plantation wood or zelkova from elsewhere in Asia, which is the same genus but not always the same density or figure. Reclaimed beams and posts from dismantled kominka are the other real source, and often the best one: a hundred years of drying leaves a stability no kiln schedule buys.

Working notes

Keyaki glues and finishes well and takes a lustrous surface with plain oil. Its interlocked grain can tear under the plane on a bad day; a sharp, high-angle plane or a scraper keeps the figure clean. Pre-bore for screws near the ends; the hardness that makes it last makes it split at a careless fixing.

The figure and the cut

Keyaki's flame figure lives in the way the board is sliced: quarter-sawn stock shows the bold, flickering pattern across the face, while flat-sawn boards show it as a wilder, more broken flame. The figure is the reason a plain table top of keyaki needs no ornament; it is also the reason tear-out at the plane is the wood's one bad habit, and why a sharp iron set a degree steeper than usual is the difference between a showpiece and a grey scar.

For the buyer, the rule is short: pay for figure that shows on the show face, check the end grain for the slow growth that means the wood will hold, and leave the flawless boards for the gate.

The card, filed

Keyaki is the wood for the part that is seen and stressed at once: a gate, a table, a tread, a bowl worth turning. It is heavier and harder than the conifers it shares a roof with, and it asks to be dried and fixed with respect. Given that, it repays the trouble every day the surface is used.