Don't Skip Letting the Wood Sit: Why Acclimation Is the First Rule of Woodworking

Part 1 of the Artisan & Sons "Don'ts of Woodworking" series.

 

You've got your lumber. You've got your plan. You're ready to build.

And the first thing we're going to tell you is: wait.

Not forever. Just a few days. But skipping this step — letting your wood acclimate before you work it — is one of the most common reasons beginner woodworking projects fail. Warped panels. Joints that won't close. Drawers that stick. A dining table that was perfect in the shop and cupped by the time it reached the living room.

It all comes back to one thing: wood moves. And if you understand why, you'll never skip the wait again.

Wood Is Not Inert

Most building materials are stable. Concrete doesn't change size when it rains. Steel expands a little with heat, but nothing dramatic. Wood is different.

Wood is hygroscopic — a technical way of saying it absorbs and releases moisture from the air around it, constantly. As it takes on moisture, it expands. As it releases moisture, it shrinks. And because wood is made of fibres that run in one direction, it doesn't expand evenly in all directions. It moves most across the grain (the width of a board), very little along the grain (the length), and barely at all end-to-end.

This is why a solid wood coffee table in a dry Alberta winter will behave differently than the same table in a humid Ontario summer. It's not a flaw in the wood — it's just what wood does. Building with solid wood means accounting for this movement at every stage, starting before you make your first cut.

What Acclimation Actually Means

Acclimation is the process of letting wood adjust to the environment it will live in before you work it.

Every piece of lumber has a moisture content — measured as a percentage of the weight of water relative to the weight of the wood. Freshly cut (green) wood can have moisture content above 50%. Kiln-dried lumber, the kind you buy at a hardwood dealer or lumber yard, is usually dried down to 6–8% before it's sold.

But here's the issue: your shop, your home, and the lumber yard all have different levels of humidity. When wood moves from one environment to another, it starts adjusting its moisture content to match. That adjustment takes time — and while it's happening, the wood is moving.

If you cut and join boards while they're still adjusting, you're building on shifting ground. The pieces you cut to fit today will be different sizes in two weeks.

Acclimation means letting the wood finish that adjustment before you start working it, so what you build stays the way you built it.

How Long Does It Take?

The general rule is **one week per inch of thickness** for rough lumber, though kiln-dried hardwood often stabilizes faster — typically three to seven days for boards under 1.5 inches thick.

A few factors affect this:

• How different are the environments? Moving wood from an outdoor lumber yard into a climate-controlled workshop in Saskatchewan in January is a big jump. That wood needs more time. Moving it from one heated shop to another similar space needs less.
• How thick is the stock? Thicker boards take longer because moisture moves slowly through dense wood. A 4/4 board (about 1 inch thick) acclimates faster than an 8/4 slab.
• What species is it? Dense, tight-grained woods like hard maple and white oak move less than open-grained or softer species. But they still move. Don't skip the wait just because you're working with a stable species.
• What's the final use? If you're building a small decorative shelf that will sit in a temperature-controlled room, you have a little more margin. If you're building a large solid wood dining table or a wide coffee table top — pieces where any movement is visible — acclimation matters more.

When in doubt, give it more time. A few extra days costs nothing. A warped panel costs the whole project.

How to Acclimate Wood Properly

Acclimation isn't complicated, but there's a right way to do it.

• Sticker the boards. Don't stack lumber in a pile flat against itself. Air needs to circulate around every face of every board. Use thin strips of wood (called stickers) placed perpendicular to the boards, every 12–16 inches along the length, to create airflow between layers. This helps the wood adjust evenly on all sides.
• Acclimate in the right location. The wood needs to sit in the environment it will ultimately live in — or as close as you can get. If you're building furniture for a client's home, acclimate in your shop first, and ideally allow more time once it arrives at its destination before doing any final fitting. If you're building for your own space, your shop humidity should be close to your home humidity. A basic hygrometer (a cheap tool that measures humidity) helps you keep track of this.
• Don't rush it with heat. Placing boards next to a heat source to speed things up creates uneven drying and can cause checking (small surface cracks) or cupping. Let it happen at its own pace.
• Check before you cut. If you have a moisture meter, check the boards after a few days. You're looking for the moisture content to stabilize — when readings stop changing between checks, the wood is ready. If you don't have a meter, time and patience are your tools.

What Happens If You Don't

Here's what skipping acclimation actually looks like in practice.

You buy beautiful, flat boards. You mill them, joint the edges, glue up a wide panel. It looks perfect coming out of the clamps. You cut it to size, sand it, finish it.

Then, over the next few weeks, as the wood continues adjusting to its environment, the panel moves. Maybe it cups slightly — the edges lift while the center stays flat, or vice versa. Maybe a glue joint opens a hairline gap because the boards on either side of it moved in slightly different directions. Maybe the drawer you built to a perfect fit now sticks every time the humidity goes up.

None of these are dramatic failures. But they're the difference between a piece of furniture that looks handcrafted and intentional, and one that looks like it was built by someone still learning. On a solid wood piece — a coffee table, an end table, a custom furniture build — this kind of movement is visible. It's felt. Customers notice.

At Artisan & Sons Workshop, every piece of solid wood we work with sits in the shop before it touches a machine. It's one of those steps that doesn't show in the finished product — but it's the reason the finished product holds up.

---A Note on Engineered Wood---

If you're working with plywood, MDF, or other engineered sheet goods, acclimation matters less. These materials are manufactured to be dimensionally stable, and while they can still respond to extreme humidity changes, they don't move the way solid wood does.

This is one reason engineered wood is common in cabinet carcasses and drawer boxes — stability is predictable. But if you want the look, feel, and longevity of solid wood furniture — and the ability to say it was built by hand from real material — you work with solid wood. And with solid wood, you acclimate. No exceptions.

The Beginner Takeaway

If you're new to woodworking and you take nothing else from this article, take this:

Buy your lumber a week before you plan to work it. Stack it properly in your shop with airflow between the boards. Let it sit. Then build.

It costs you nothing but time. And it's the difference between a project that holds together for years and one that starts telling you about its problems within weeks.

Solid wood is one of the most honest materials you can work with — it rewards patience and attention. This is the first place to practice both.

Next in the series: Don't Cut Against the Grain — what tear-out is, why it happens, and how to read a board before you touch it.

Artisan & Sons Workshop crafts small-batch, made-to-order solid wood furniture in Saskatoon, Canada. Our pieces — from handcrafted solid wood coffee tables to custom end tables and nesting tables — are built to last generations. See the full collection at [artisanandsons.ca](https://artisanandsons.ca).