What is Efflorescence??

April 7th, 2021

What Is Efflorescence buildup on Stone, Stucco, and Concrete?

Efflorescence is a salt mineral or crystal, it’s appearance looks white, grey and fuzzy. Found on the outside and inside of your basement walls, stone, stucco, concrete, or other building surfaces. It is a common problem in masonry block and concrete foundations.  In this article the waterproofers at ACCL Waterproofing will go over what efflorescence buildup  is and what you can do to prevent it.



Is Efflorescence Buildup Harmful or cause damages?

The buildup isn’t hazardous, although seeing it could mean you have a moisture problem. Ignoring the signs can cause deterioration.

Correcting and fixing the moisture problem and leaks is efficient to efflorescence removal.

How Does Efflorescence Occur?

Water, rain and snow are the primary sources of moisture and may impact the degree of efflorescence 

Three conditions exist before efflorescence can occur:

  1. There must be water-soluble salts present somewhere in the wall.
  2. In order for the salts to turn into a soluble solution there must be enough moisture in the wall.
  3. Soluble salts must have an open path in order to migrate/move through a material the surface. This will cause the moisture to evaporate and crystallize, resulting in efflorescence.

Efflorescence buildup cannot occur if any of these three conditions are not present. 

More than often homes that are being built or under construction can make the masonry units become exposed to water and moisture (if they aren’t covered up properly) due to rain and other weather elements.

in many instances, efflorescence may occur during home construction. If masonry units are left out overnight during construction, they can absorb moisture from damp soil and rain. It is essential for masonry units to be covered and left in pallets to minimize the risk of efflorescence throughout a construction project.

Various building surface installation problems may lead to efflorescence, including:

Various building surface installation problems may lead to efflorescence, including:

  • Incorrect use of through-wall flashing
  • Use of masonry without sufficient ventilation
  • Use of masonry in areas that lack a proper moisture barrier
  • Joint material failure
  • Improper ground storage


Effective Removal;

If you don’t regulate moisture problems, or if you have a leak in your house efflorescence will continue to re-appear.

How To Prevent Efflorescence?


Seeing efflorescence crystals most likely means there is a leak somewhere letting outside water in. The best way to prevent this problem is to prevent the water from gaining access to the wall.

When the source of the water leak is found and stopped the walls should be cleaned with a remover or cleaner.

With the correct materials and construction it’s an easy fix! as it is a controllable condition.


The basement waterproofing specialists at know how to repair your basement and foundation walls and keep moisture out of your basement. Accl Waterproofing would be pleased to develop a guaranteed unique solution to keep your basement dry.

When you choose ACCL Waterproofing, you have the peace of mind, knowing that you have a trusted name in basement repair and waterproofing working to keep your basement dry.

Rely On our ACCL Wet Basement Waterproofing Experts

If you notice efflorescence around your homes interior or exterior walls, or if your home has increased moisture CALL 905-448-5904 or CLICK HERE to visit our contact page.

The basement waterproofing specialists at ACCL Waterproofing know how to repair your basement and foundation walls and keep moisture out of your basement. We would be pleased to develop a guaranteed solution to keep your basement dry!


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