Efflorescence is normally worn off or washed away on unsealed concrete surfaces.
Concrete roof tile white stains.
Efflorescence will be triggered by low temperatures humidity condensation and rain.
Water absorption also increases the already heavy weight of concrete tile and puts increased pressure on the roof structure.
White stains on slate roofs efflorescence or salt stains from rain water sometimes appear on slate shingles.
It is due to the migration of soluble salts that are present in the cement based substrate.
Your concrete tile roof is undergoing a natural process called efflorescence.
As with the slate roofs discussed above white stains on tile roofs are typically an efflorescence deposit and may indicate that the tile is absorbing water thus nearing end of life.
All concrete products including sidewalks and bricks can experience this.
Trees plant debris stains stain patches under trees or nearby may be due to seeds berries leaves and other debris falling and decaying.
No need to worry.
My concrete tile roof has a rough surface that would take the stain the kind of add in color to color to mortar when laying brick i wonder about the durability.
Combination of moisture and concrete is troublesome.
Then use a broom to scrub clean your patio or wall.
Such discoloration known as efflorescence is caused by salts that are brought to the surface of new concrete by the natural curing process.
Reply to david short.
The stains are normally white and are present in darker colors more than white or pale colors due to the contrast created by the chemical reaction.
This can be the concrete the mortar bed tile adhesive or grout.
Efflorescence is the white powdery substance on the surfaces of unsealed concrete and the white blush seen with sealed floors.
Moss often grows in the shade of trees too.
This higher rate of water absorption can lead to the development of mildew and stains.
Take a clean bucket and fill it with warm water and add about 300 ml bleach to it.
White stains or a white powdery coating on new concrete is not uncommon.
However where we have seen white effloresence staining on clay tile roofs such as the mexican clay tile roof photographed below i have not seen a notable correlation with remaining clay tile roof life.
Concrete can be stained when salts and other materials will come off the concrete surface.
Pour the mixture over the white stains on the tiles or bricks and let it soak for 10 to 15 minutes.
If you recently had a new concrete tile roof installed there s a slight possibility that you may notice chalk like residue or what appears to be color softening on your tile.
Now it s time to start your fight with the white stains.