Solid wood never stops responding to the air around it. It absorbs moisture when the air is humid and releases it when the air is dry, swelling and shrinking a little across the width of each board. In a dry climate, the main risk is shrinkage that happens too far or too fast. Here in eastern Washington, where summers are hot and dry and winters are cold enough that the furnace runs for months, both seasons push indoor air toward the dry end.
What dry air does to solid wood
Wood moves mostly across the grain, not along it. A wide tabletop will change width slightly between seasons, while its length barely moves. When the air gets very dry, that movement can show up as:
- Small gaps between boards in a glued-up top or between panels and frames.
- Surface checks, which are fine cracks along the grain, often at the ends of boards.
- Loose joints in chairs and table bases as the parts shrink at different rates.
- Drawers and doors that fit differently, sometimes looser in winter and tighter in early summer.
- A dull, thirsty finish, as dry air and sun pull the oil finish out of the surface faster.
Most of this is normal seasonal movement and closes up again when humidity returns. The goal is to keep the swings moderate so the wood never moves farther than the construction can handle.
Know your numbers: relative humidity
Relative humidity (RH) is the measure that matters. Solid wood furniture is happiest when indoor RH stays roughly between 35% and 55%, and when it changes gradually rather than overnight. In dry regions, indoor air in winter can easily drop well below that range once the heat is on.
A basic digital hygrometer is inexpensive and takes the guesswork out. Place it in the room with your best pieces, away from windows and vents, and check it through the seasons. You will quickly see when your home tends to dip.
Seasonal care in a dry climate
Winter: heated air
- Run a humidifier in the main living areas when the furnace is on. A whole-house unit on the furnace is the simplest option. Room units work well if you keep them clean.
- Do not overshoot. Keeping RH in the 35% to 45% range in cold weather is usually enough and helps avoid condensation on windows.
- Keep furniture several feet from heating vents, baseboard heaters, fireplaces and wood stoves. Direct hot air dries one side of a piece faster than the other.
Summer: heat and sun
- Close blinds or use sheer curtains in rooms with strong afternoon sun. UV and heat dry and fade any finish.
- Avoid placing pieces directly in the path of air conditioning or evaporative cooler outlets, which create local swings.
- Rotate items like lamps and bowls on tabletops now and then so the wood ages evenly instead of leaving shadow outlines.
Spring and fall: transitions
These are good times to check joints, tighten any hardware on bases or bed frames, and give oiled surfaces a refresh before the next dry season.
Keep the oil finish nourished
A penetrating oil finish does not stop wood from exchanging moisture with the air, and no finish fully does. What it does is slow the exchange and keep the surface fibers supple. In dry climates, oiled surfaces may look thirsty sooner than in a humid one.
- Dust weekly with a soft, dry cloth.
- Every few months, do the water-drop test on busy surfaces. If drops soak in and darken the wood, it is time for a light coat of oil.
- Apply oil thinly, wipe off all excess, and let it cure in a room above about 60°F.
- Avoid silicone spray polishes, which leave a film that makes future re-oiling harder.
Our finishing page explains the hand-rubbed oil-wax finish we use and what to apply when it needs a refresh.
When new furniture arrives
A new piece has been built, finished and shipped through different climates before it reaches your door. Give it time to settle.
- Unpack it soon after delivery so it is not sealed in plastic in a hot garage.
- Let it sit in the room where it will live for two to four weeks before making judgments about small gaps or a drawer that feels snug.
- Keep the hygrometer nearby during that period and nudge humidity toward the middle of the range if it reads very low.
Our pieces are made to order, so after you approve photos of the finished build, the piece ships to you free across the contiguous U.S. Our FAQ covers timing and what happens if anything arrives damaged.
Signs it is time to act
- A gap that keeps growing even after humidity has stabilized.
- A crack that runs through a joint or reaches the edge of a board.
- A chair or table that wobbles even after you tighten its hardware.
In these cases, bring humidity back into range first and wait a few weeks. Many issues settle on their own. If they do not, a local furniture repair shop can reglue joints or stabilize checks.
FAQ
What humidity is best for solid wood furniture?
Roughly 35% to 55% relative humidity, with slow changes. In cold winters, the lower half of that range is fine and helps avoid window condensation.
Will a small crack in my tabletop get worse?
Fine surface checks often close partly when humidity rises. Keep RH steady and the finish oiled. If a crack keeps widening over several weeks at normal humidity, have it looked at by a repair shop.
Should I oil my furniture more often in a dry climate?
Often, yes. Dry air and strong sun can make an oil finish look thirsty sooner. Let the water-drop test guide you, and apply thin coats rather than heavy ones.
Is it safe to put wood furniture near a wood stove?
Keep it well back from any stove, fireplace or heating vent. Direct radiant heat dries one side faster than the other, which is a common cause of warping and cracking.