How to fix and prevent salt blooming on wall?« Back to Previous Page

That's efflorescence, a salt deposit left behind when water-soluble salts in the concrete or plaster migrate to the surface with moisture and then crystallize as the water evaporates. In Dubai's humid climate, this is a common indicator of a persistent dampness issue within the wall itself.

For cleaning, first identify and stop the moisture source. Then, use a stiff dry brush to remove the bulk of the crystalline deposits. Follow with a light wash using a diluted white vinegar solution (one part vinegar to four parts water) and a non-abrasive cloth, then rinse thoroughly with clean water and allow the area to dry completely. Do not use excessive water, as this will only drive more salts to the surface.

Preventing its return requires fixing the root cause of the dampness. In many UAE villas and apartments, this is often due to capillary rise from the ground, a leak in concealed plumbing, or, most commonly, thermal bridging and condensation caused by the constant high outdoor heat meeting year-round air conditioning. The wall cavity cools, attracting humid air which then condenses.

A professional inspection is strongly recommended to diagnose the exact moisture pathway. Permanent repair often involves addressing external waterproofing, improving ventilation around the area, or applying a specialised penetrating damp-proof coating or slurry to the affected wall section internally, which blocks the salts from migrating. Simply repainting over it will not work; the bloom will break through the new paint.