What is efflorescence?
Efflorescence is a temporary surface discoloration common to all concrete products, and is caused mostly by the reaction of cement with water. Manufactured cement contains free lime and when water is added a series of chemical reactions take place. These reactions result in crystalline deposits of water soluble salts on the surface of the tile. It appears as an overall white powder which seems to soften the color or is in concentrated patches. Though cycles of wetting and drying cause efflorescence, these cycles are also part of its removal. Wind and rain working together gradually dissolve these deposits. Primary efflorescence can be removed with a number of solvents for a quicker solution. It is important to remember efflorescence occurs naturally and in no way affects the structural integrity or performance of the tile or roof system.
