Efflorescence Issues

For Professional Use Only

What is EFFLORESCENCE?


Efflorescence is often described as a white or ivory chalk-like deposit. Efflorescence is formed by water migrating through the masonry wall and out the pores. As it passes through the wall, it collects loose salt and lime and brings them to the surface. As the water evaporates, the salt or lime particles bond to the wall causing white stains.

Not every "white stain" on a wall is efflorescence!

Calcite - calcite, or calcium carbonate, will appear as a thick whitish deposit that usually forms over time. Calcite most commonly forms on brick and block, when excess moisture evaporates and leaves behind a heavy calcium residue.

Lime Run - lime run occurs as a steady release of calcium soaked water that creates a streak. Generally, lime run is treated just like calcite. When it is caught early enough, the normal wash process of NMD 80 (4:1) will be effective enough to remove it.

White Scum - white scum, or calcium silicate, has traditionally come as a result from improper use of new masonry cleaner, reacting with brick and forming insoluble salts. This is created by un-buffered acid combining with silicates and clay.

Integral Water Repellent - integral water repellents or admixtures can sometimes bleed out of the brick or block, leaving behind a "white stain" that has very similar characteristics to efflorescence or white scum; however the removal process is completely different.

As you can see by the pictures below, not all white stains are the same. While some of them appear to be very similar, a simple test with water will help you determine if you have efflorescence or another variety of white stain. Simply spray water on an affected area. If the stain disappears when wet and re-appears when dry, most likely it is efflorescence. If the stain is still visible, most likely it is not efflorescence.

 

Is It Efflorescence?

Efflorescence

Efflorescence

This project was cleaned with EF-Fortless

Calcite

Calcite

Cleaned with Calcite Presoak

Integral Water Repellent

Integral Water Repellent

Cleaned with OneRestore

Integral Water Repellent

White Scum

Cleaned with White Scum Presoak

Sealer Failure

Sealer Failure

AcryliStrip was used

Lime Run

Lime Run

Calcite Presoak was used

Lime Run

Hardwater Mineral Deposit

OneRestore was used

Efflorescence

Efflorescence

EF-Fortless was used