White Spots On Concrete Roof Tiles

Efflorescence is caused by vapor migrating through the slab bringing soluble salts to the surface of the concrete.

White spots on concrete roof tiles.

This can be the concrete the mortar bed tile adhesive or grout. That s not what you want. Efflorescence is normally worn off or washed away on unsealed concrete surfaces. Efflorescence is the white powdery substance on the surfaces of unsealed concrete and the white blush seen with sealed floors.

It is due to the migration of soluble salts that are present in the cement based substrate. Lime staining and efflorescence is caused by natural processes. Your concrete tile roof is undergoing a natural process called efflorescence. Paint on stucco failures also describes white blotches showing up on building surfaces because of improper painting or sealing of masonry or stucco materials.

White or less black roof surfaces may also be found below copper or aluminum flashing whose salts run down the roof surface in wet weather preventing algae or moss growth and leaving a white area on an otherwise stained roof surface. With cement based roofing products subtly different reactions taking place at various stages of the production process and lifespan of the. Manufactured cement contains free lime and when water is added a series of chemical reactions take place. Our efflorescence article above also diagnoses white stains on chimneys.

All concrete products including sidewalks and bricks can experience this process. When it rains the rain water comes into contact with the natural elements within the brick or tile which leads to lime staining. Called efflorescence this white stain is simply the residue of salts on the surface of the tile. With the latter it is often misinterpreted as a fading or washing out of the colour of the material.

It is simply a chemical reaction caused by the nature of the cement. Lime on brick or concrete tiles often takes on a white color which can really mess up the look of your patio or the walls of your home. Efflorescence salts white deposits.