Gaps Between Floor Planks in Austin TX: Why They Happen and How to Fix Them
Gaps between hardwood or LVP planks are one of the most common flooring concerns we hear about from Austin homeowners — especially in the winter months when Austin's air gets dry. If you are seeing spaces between your floor boards that were not there before, here is what is happening and what to do about it.
Why Do Gaps Form Between Floor Planks?
Wood is hygroscopic — it absorbs and releases moisture based on the surrounding air. When the air is dry, wood releases moisture and shrinks. When the air is humid, wood absorbs moisture and expands.
In Austin, this cycle is dramatic:
- Winter: Low humidity (30–40% RH) causes wood floors to shrink, opening gaps between planks
- Spring/Summer: High humidity (60–80% RH) causes wood floors to expand, closing gaps
- Wider than 3mm (about 1/8 inch)
- Permanent — not closing in summer
- Accompanied by cupping or crowning
- Appearing in LVP or engineered hardwood
This is normal behavior for solid hardwood floors. Gaps that open in winter and close in summer are not a defect — they are wood behaving as expected in Central Texas.
When Are Gaps a Problem?
Normal seasonal gaps are typically less than the thickness of a nickel. Gaps that are:
...indicate a problem beyond normal seasonal movement.
Causes of Abnormal Gaps in Austin Floors
| Cause | Floor Type | Fix |
| --- | --- | --- |
| Chronic low humidity (HVAC over-drying) | Hardwood | Humidifier, HVAC adjustment |
| Improper acclimation before install | Hardwood, Engineered | Re-install with proper acclimation |
| Subfloor movement | All types | Subfloor repair |
| Missing expansion gap causing compression | LVP, Laminate | Cut expansion gap, allow floor to relax |
| Moisture damage causing permanent shrinkage | Hardwood | Board replacement |
How to Fix Floor Gaps in Austin
For seasonal gaps in solid hardwood: The best solution is humidity control. A whole-home humidifier connected to your HVAC system maintains consistent humidity year-round, minimizing seasonal movement. Most gaps will close on their own when humidity rises in spring.
For permanent gaps: Wood filler or rope caulk can fill gaps temporarily, but they will crack when the floor expands again in summer. The only permanent fix for abnormal gaps is to identify and address the root cause, then re-install or replace the affected boards.
Capital City Flooring Austin diagnoses and repairs floor gap issues throughout Austin and Central Texas.
Call or text: (512) 769-2292
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*Related: Hardwood Acclimation in Austin TX | Why Is My Floor Buckling? Austin TX Guide*