How do the thermal expansion coefficients of granite and marble compare in outdoor tree boxes?
When selecting materials for outdoor tree boxes, understanding thermal expansion is crucial for long-term durability. Granite and marble, both popular natural stones, exhibit different thermal expansion behaviors. Granite has a lower thermal expansion coefficient (approximately 5-9 × 10⁻⁶/°C) compared to marble (around 10-12 × 10⁻⁶/°C), making it more stable under temperature fluctuations. In outdoor environments, where temperature changes are frequent, granite is less prone to cracking or warping. Marble, while aesthetically pleasing, may require more maintenance due to its higher expansion rate. For tree boxes exposed to sunlight and seasonal shifts, granite is often the more reliable choice.
