If you build furniture in Selangor, you build furniture against humidity. We measured the workshop at 4:00 in the afternoon last Wednesday: 84% relative humidity, 31°C, the kind of day where you don’t bother arguing with the dehumidifier — you just open the windows and accept it. That number matters because the wood you cut on a day like that wants to drink in the room.
What “8% moisture content” actually means
Kiln-dried furniture timber in the UK is typically held to 8–10% moisture content. Here, the same plank fresh off a Selangor mill will read around 14–16% on a pin meter, often higher near the heart. If we joined a sofa frame at 14% and you took it home to an air-conditioned bedroom that runs at 55% RH, that frame would lose about three percent of its moisture over the next month, shrink, and start to creak.
So we dry. Our mill partner in Kuala Selangor delivers timber pre-dried to roughly 11%. We then put every plank through a second pass in our own small dehumidifier-and-fan kiln at the workshop, pulling it down to a steady 8%. It takes seven to ten days for a typical batch. Yes, we could skip it and use the mill-dried stock directly — we don’t, because the second dry is where joints stop moving.
What the second dry catches
The first kiln dries the outside. Pull a board out of a commercial kiln, slice it in half across the grain, and the centre will often still read three points wetter than the surface. That gradient causes “case-hardening,” which is exactly as ominous as it sounds: the outside of the plank is set, the inside is still working, and when you joint it under a mortise the wood pushes back and the joint never seats true.
Our second dry is slower and gentler — lower temperature, more circulation — and it allows the gradient to equalise. By the time the plank reaches our cut bench, the meter reads the same number whether we probe the surface, the edge or the centre. That is the difference between a chair you can pass to your daughter and a chair that creaks by year three.
How long this adds to a Boldtura commission
The second kiln pass is in our standard 12-week residential timeline. We don’t bill it separately — it is part of why our frames last. The only practical effect for the client is that we ask for fabric and final dimensions to be confirmed early, so we can pull the timber from the kiln on the day we need it rather than reopening the cycle.
One small benefit: because we run the kiln continuously, off-cuts and shorts get a second life as box-section structural rails, drawer fronts and prototype mock-ups. Nothing that has been through both dries ever leaves the workshop wet.
If you want to see the kiln, ask for it on your workshop visit. It is in the back room beside the spray bay and it is louder than it looks.