Category: Finishes
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Efflorescence is a white salt deposit on a wall surface, formed when water carries dissolved salts from blocks, mortar or soil to the surface and evaporates. It is common on walls against soil and where salty sand or water was used.
Why it matters on a project
It is not structural damage in itself, but it signals ongoing moisture, peels paint and stains stone. The cure starts with stopping the water source before cleaning the surface.
Common mistake
Painting over efflorescence without finding the moisture source, so it returns within months and peels the new paint.
Frequently asked questions
How is efflorescence removed?
Dry brushing first, then a suitable cleaner if needed, after stopping the moisture source.
How do I prevent it?
Clean sand and water, waterproofing on walls against soil, and keeping irrigation water off walls.
Related terms
- MortarA mix of cement, sand and water for blockwork and plaster.
- WaterproofingLayers preventing water ingress into structural elements or spaces, such as bituminous membranes and cementitious coatings.
- External texture paintFacade coatings that resist sun and moisture, including textured finishes.
- Stone claddingCovering facades with natural stone panels fixed to the building.
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