DESIGNER TIP Don't leave your grout colour to your tiler!
Our design team suggest you use Grout colour 10 Dark Grey to blend with the tile or Grout colour 08 Cement to contrast with the tile.
Recommended Grout Joints - (We have assumed that your substrate has a perfectly flat and plumb surface, please check with your tiler.)
2mm grout joint. Based on this joint size, 1 bag of grout would cover 25m².