Why does a wooden staircase creak?

Question

Accepted Answer

Creaking noises in wooden staircases usually have natural causes:

**Why does it creak?**
Wood is a living material that absorbs and releases moisture. Due to **temperature and humidity fluctuations**, the wood shrinks or expands minimally. This can cause joints and connections to loosen slightly -- when walked on, the components rub against each other and produce noise.

**Common causes:**
- Indoor air that is too dry (below 30% relative humidity)
- Significant temperature fluctuations
- Loose fastenings after prolonged use
- Friction between tread and stringer or between tread and riser

**What helps?**
- **Stabilise the indoor climate:** 18--24 degrees Celsius, 30--60% humidity
- **Identify the friction point** and apply elastic sealant if needed
- **Tighten screws** if accessible
- For more severe creaking, consult a specialist

**Important:** Slight creaking is normal for wooden staircases and is not a quality defect. It occurs particularly during the first heating season, as the wood adjusts to the indoor climate.