What are the slip resistance ratings for granite outdoor tree box surfaces?

Granite is a popular choice for outdoor tree box surfaces due to its durability and aesthetic appeal. However, slip resistance is a critical factor for safety, especially in high-traffic or wet conditions. The slip resistance of granite is typically measured using standards like the DIN 51130 (Germany) or ASTM C1028 (USA), which evaluate the coefficient of friction (COF).

For outdoor applications, granite surfaces should ideally have a COF of 0.6 or higher to be considered slip-resistant. Textured or flamed finishes can enhance traction, making them safer for walkways and public spaces. Always check with suppliers for specific ratings and choose finishes that meet local safety regulations. Proper maintenance, such as regular cleaning to prevent algae buildup, also helps maintain slip resistance over time.

By understanding these ratings, you can ensure safer and more reliable granite surfaces for outdoor tree boxes and other landscaping features.