What is efflorescence?
Efflorescence is a concentration of salts (calcium hydroxide) present in all cements and other mortar constituents such as sand aggregates and lime which move through grout joints to the surface. Once this concentration reaches the surface, it reacts with the carbon dioxide in the air forming “Calcium Carbonate”. This then dries leaving behind white crystals which discolour the grout.
Efflorescence is more prominent in winter months as the weather is colder and moisture more prevalent. It is more noticeable on darker grouts due to the colour contrast.
How can I contain or reduce efflorescence?
The key is to avoid excess water throughout your tile installation system. You should use fast setting adhesives such as Davco's 1 Part Rapid or 2 Part Rapid and use a low efflorescence grout such as Davco's Elite ColourGrout. Be sure to reduce the amount of water used in clean-up and avoid early clean-up of grouting. Allow grout to set fully for 24 hours prior to cleaning grout haze.
There are many other products and ways of avoiding and removing efflorescence. Ask the staff at Nerang Tiles for more information.