Efflorescence is often seen as a white fluffy deposit of salt crystals on cementitious (e.g. masonry) wall surfaces. Efflorescence depends on the presence of salt and moisture, and the growth of crystals will continue as long as both are present.
Once the water source is eliminated, most efflorescence (also called Calcium Carbonate or limestone) can be removed with abrasive techniques. Dry brushing, light water blasting or light sandblasting followed by flushing with clean water. In large areas, rotary scrubbers with scrubbing pads may also be used.
In all but very extreme cases, efflorescence will stop as capillaries in the stone become blocked by crystallized salts. Once the process stops, the white deposits will eventually wear off with use and exposure.
Recurring efflorescence indicates a chronic moisture or water flow problem such as from ground water in retaining walls, around un-caulked window openings, non-full mortar joints.
Clear water repellents, silicone and acrylic coatings also may help you remove efflorescence as well. The coating will absorb water across a masonry surface and prevent efflorescence from recurring. Plus, the combination of warm water and white wine vinegar has been shown to eliminate efflorescence.
Efflorescence itself isn't dangerous or harmful. It can lead to potential moisture problems that can cause structural damage to building materials. So it is important to take action when you notice efflorescence in your basement, on your paving stones, or on other structures.
The acidity in the vinegar helps remove the efflorescence and calcium deposits by breaking down mineral crystals. After cleaning the surface, let dry for 48-72 hours (moisture content below 25%).
The primary source of moisture for the occurrence of efflorescence is rainwater that penetrates or comes in contact with masonry. Rainwater will penetrate all masonry walls to some degree, more so if they are improperly designed or detailed.
We were told a diluted CLR solution would work. We tried this and it was a lot of work to scrub the surface clean of the residue and you have to be sure to rinse immediately because technically CLR is not for painted surfaces.
The Extent of the Issue: A small amount of efflorescence might not be a deal-breaker, but extensive or recurring efflorescence could indicate significant moisture problems.
Painted surfaces already damaged by efflorescence must NOT be repainted until the source of the moisture is identified and eliminated or blocked (by waterproofing). It may be necessary to engage the services of a qualified waterproofing specialist.
A stiff scrubbing brush and a dry brushing technique will remove the efflorescence. Muriatic acid can be used for efflorescence removal, but it poses risks such as discolouration and potential surface damage. Consider safer commercial solutions.
Despite the appearance of stains or marks on the surface, it's important to note that efflorescence will not compromise the strength or durability of your concrete pavers. Its impact is solely aesthetic and temporary in nature.
An acidic cleaner, such as PROSOCO's Sure Klean Light Duty Concrete Cleaner, and Sure Klean Vana Trol can dissolve efflorescence more effectively.
Efflock. Efflock is a high-performance, water-based, VOC-free, liquid additive designed for the bulk impregnation of cement-based building materials to protect against efflorescence and dampness. By controlling water absorption, efflorescence is locked and the potential for waterproofing failure is dramatically reduced ...
Give us a call at 832-294-5462 or contact us online if you find efflorescence or other signs of water damage in your California home.
To remove the efflorescence, I suggest using Crommelin 4L Efflorescence Remover in combination with a stiff bristle brush. Please make sure to follow application instructions and allowing the product to activate first. If washed or removed too early the product will not work properly.
If CLR Grease & Oil Remover is left on a surface for too long it begins to dry and can be very difficult to remove.
You can also make a stone, concrete or tile installation less prone to efflorescence by using materials with low salt and mineral content, as well as reducing the amount of water used in concrete or mortar mixes and allowing them to thoroughly dry.
Preventing Efflorescence in Concrete, Brick, & Pavers. Cleaning the visible stain is only the first step. Unless something else is done, the efflorescence will be back soon.
Vinegar is extremely effective against removing efflorescence from any surface, whether it be interlocking pavers, concrete pavers or bricks. You also do not have to worry about rinsing dangerous acids into the soil around your pavers.
V-SEAL creates an incredible water barrier for brick, mortar, and all forms of concrete. To help prevent efflorescence, V-SEAL should be sprayed anywhere brick, mortar or cement will be exposed to water.
Efflorescence appears as a result of salt being pushed to the surface of masonry. It's a painting issue that's easily overcome by the use of Zinsser Watertite®.
Once your concrete has dried, you can use either bleach or muriatic acid to remove efflorescence from your concrete sidewalk or driveway.
Efflorescence can generally be expected to disappear over time, depending on the environment where the paving or brickwork is on a project. However, rainwater, being slightly acidic, can dissolve the surface deposit.