While no tile or other outdoor flooring can be entirely “slip-proof,” there are industry standards and tests that determine the slip resistance of tiles. Coefficient of friction refers to the effort needed to move an object across the tile surface and indicate a tile’s slip resistance. The DCOF (Dynamic Coefficient of Friction value) is the industry standard, setting the minimum standard for interior floor tile at ≥ .42 DCOF. For exterior applications, whether walkways or around the pool, the minimum standard is set at ≥ .60 DCOF. Reviewing the DCOF rating of porcelain tiles is advised to ensure you’re choosing a product that is safe for outdoor use.