ARDEX-FLEX FS and ARDEX-FLEX FL tile grouts are suitable for use in areas with long term temperatures of 80°C, so can be used around log burners. ARDEX FLEX-FS Flexible Tile Grout is ideal for tile joints up to 4mm wide, whilst ARDEX FLEX-FL Flexible Rapid Setting Tile Grout is ideal for tile joints 3-15mm wide. Both tile grouts are available in 35 different colours and a range of bag sizes.