If you are planning to install Travertine outdoors, it’s best to take some precautionary measures.
On a covered porch that is not directly exposed to the elements, you can use either Honed & Filled or Brushed & Chiseled Travertine Tiles. However, on an outdoor patio, it’s best to stay away from Honed & Filled Tiles as the slip factor becomes increasingly high when they get wet.
Instead, use either the Brushed & Chiseled Travertine Tiles, or the Tumbled Travertine Pavers.