Reading a reclaimed beam

The best keyaki in the country is not in the forest; it is stacked in salvage yards, still carrying the mortise pockets and smoke of the house it was cut from. A reclaimed kominka beam is a bargain and a document at once, and the skill is reading it before money changes hands.

First read: the species and the past life

Start at the end grain. A dense, close-ringed end with deep colour is likely keyaki or old sugi; a coarse open grain is younger or a softer wood. The old mortise pockets and peg holes are not damage but provenance, they show where the beam sat in the frame, and a beam that spent a century bearing a roof in a dry kominka is better seasoned than anything a kiln can sell you.

The checks that matter and the ones that do not

Longitudinal checks near the ends are drying checks and usually cosmetic. What the file warns about are the cracks that run deep into the body along the grain, the ones that open wider under load, and any crack that enters an old mortise pocket, there the member's strength is already spent. Tap along the length: a sound beam rings, a punky or hollow one thuds.

The insects' ledger

Small round flight holes are the record of powderpost beetles, mostly old news in dry timber. What matters is whether the wood still powders: press a fingernail into the surface and probe the galleries with a pick. Dusty frass that falls fresh, soft wood around the holes, or galleries that continue to the surface are signs the colony may not be finished. Old galleries in hard, dry wood are character, not cause.

Measuring it honest

Check moisture before pricing: a salvage beam at equilibrium indoors reads like new dry wood; one stored under a tarp outside can be wet for a metre inside the ends. Measure the actual section, not the nominal one, a beam that lost an arris to a century of handling is a beam with a smaller cross-section than its looks suggest.

The price of history

Reclaimed timber prices itself against two things: what a new board of the same species would cost, and what the demolition would cost if the beam went to waste instead. Between those two numbers is where the yard lives, and where the buyer who can read a beam does well: the wood is dry, old, often a better grade than anything new at the price, and it carries a history the new board never will. The beam that rings true under the knuckles is worth more than the same dimensions fresh-sawn, and the beam that thuds is worth nothing at any price.

That is the whole trade in a paragraph: read the end, ring the middle, price the history, and never buy a beam you have not knocked on.

The card, filed

A reclaimed beam is bought on evidence: end grain for species, surface for checks, pockets for provenance, tap for soundness, moisture meter for honesty. The marks of its first house are the reasons it is worth having; the same marks, read wrong, are the reasons it can fail.