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Hardwood

My Hardwood Floor Has Gaps After Winter — Is That Normal?

April 15, 2026 5 min read

Gaps between hardwood boards after winter are one of the most common calls we get in Austin. Here's the honest answer on what's normal, what's not, and what to do about it.

The Short Answer: Probably Normal, But Worth Watching

Every winter, I get calls from Austin homeowners who walk into their living room one morning and notice something they hadn't seen before — thin gaps between their hardwood boards. The first reaction is usually panic. The second is usually a Google search that leads them here.

Here's the honest answer: in most cases, gaps that appear in winter and close in spring are completely normal. Wood is a living material. It breathes. It moves. And in Austin's climate — where we swing between humid summers and dry, cool winters — that movement is more pronounced than in more temperate parts of the country.

That said, not all gaps are created equal. Some are seasonal. Some are structural. Knowing the difference is what this post is about.

Why Wood Floors Gap in Winter: The Science in Plain English

Wood is hygroscopic, which is a fancy way of saying it absorbs and releases moisture from the air around it. When the air is humid, wood fibers swell. When the air is dry, they shrink.

During Austin winters, we run our heat constantly. Forced-air heating systems pull moisture out of indoor air fast. Relative humidity in a typical Austin home can drop from 50–60% in summer to 25–35% in winter. That 20–30% swing is enough to cause visible gaps between boards — especially in solid hardwood, which moves more than engineered hardwood.

The technical term for this is "seasonal movement," and it's been happening since people started nailing wood to floors. It's not a defect. It's physics.

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When Gaps Are Normal vs. When to Worry

Normal seasonal gaps have a few characteristics. They're consistent — you'll see them across the whole floor, not just in one area. They're narrow — typically less than 1/8 inch, roughly the thickness of a credit card. And they close. By May or June, when Austin humidity climbs back up, the boards re-expand and the gaps disappear.

Gaps that should concern you look different. They're wide — wider than a credit card, sometimes wide enough to catch a coin. They're localized — concentrated in one area, often near an exterior wall, a vent, or a bathroom. They don't close in summer. Or they appeared suddenly after a plumbing leak, a flood, or a major HVAC change.

Those patterns point to something beyond normal seasonal movement: subfloor moisture intrusion, improper installation, or a floor that was never acclimated correctly to Austin's climate before it was installed.

The Austin Climate Factor

Austin sits in a unique climate zone that's hard on wood floors. We get hot, humid summers — 80–90% relative humidity in July and August — followed by dry, cool winters where indoor humidity can drop below 30%. That's a 50-point swing in relative humidity across the year.

Most hardwood flooring manufacturers recommend maintaining indoor humidity between 35–55% year-round to minimize seasonal movement. In Austin, that means running a whole-home humidifier in winter and making sure your AC is properly dehumidifying in summer.

If your floors were installed without accounting for this climate range — either by using the wrong species, skipping acclimation, or installing over a slab without a moisture barrier — you're going to see more movement than normal.

What to Do About Winter Gaps

If your gaps are seasonal and narrow, the best thing you can do is add humidity back to your home. A whole-home humidifier connected to your HVAC system is the most effective solution — it maintains consistent humidity year-round without the hassle of portable units. Target 40–50% relative humidity in winter.

If your gaps are wide or persistent, don't try to fill them with wood filler or caulk. Filler is rigid — when the wood re-expands in spring, it will crack the filler and potentially damage the boards. The right fix depends on the root cause: if it's a moisture issue, you address the moisture source first. If it's an installation problem, you may need a partial or full re-installation.

I've seen homeowners make expensive mistakes by patching gaps that were going to close on their own, and I've seen others ignore gaps that were early warning signs of subfloor water damage. If you're not sure which category you're in, a free inspection is the right first step.

Species Matter: Some Woods Move More Than Others

Not all hardwood species respond the same way to Austin's humidity swings. Wide-plank floors (5 inches and wider) move more than narrow-plank floors because there's more wood mass to expand and contract. Flat-sawn boards move more than quarter-sawn boards.

Species with higher movement ratings — like American Cherry, Walnut, and some Hickory — will show more seasonal gapping than stable species like White Oak, Maple, or Ipe. If you're planning a new hardwood floor installation in Austin, this is worth discussing with your contractor before you choose a species.

At Capital City Flooring Austin, we always talk through the movement characteristics of any species we're recommending, especially for slab-on-grade homes in Central Texas where moisture management is more challenging.

Bottom Line

Gaps after winter are usually normal. Add humidity, wait for spring, and watch them close. If they don't close by June, or if they're wider than a credit card, call a flooring contractor for an inspection before the problem gets worse.

We serve Austin, Lakeway, Lago Vista, Jonestown, Spicewood, Bee Cave, Steiner Ranch, and all of Central Texas. If you're seeing gaps that concern you, we'll come out and take a look — no charge for the inspection, no pressure on the solution.