What is Efflorescence?

Efflorescence Definition


All concrete products such as block paving, brickwork or paving slabs are susceptible to a naturally occurring phenomenon known as efflorescence. In chemistry, efflorescence is described as a growth of salt crystals caused by evaporating salt water and this white, powdery substance is an unavoidable fact of life for many concrete products.


In other words, as rain water moves through the wall or paving, the rainwater is then driven out, bringing salts to the surface and as the water evaporates it leaves the salt behind, forming a white, fluffy deposit. Efflorescence is very unsightly and is often the cause of distress for some of our clients and is completely understandable.


The good news is that efflorescence will disappear eventually and will not harm your concrete surface in the slightest. It’s difficult to say how long it will take to disappear, as there are no hard and fast rules as to when it will stop forming. It could only take a couple of weeks or it could be a couple of months or even as long as a year.


In the mean time, if you feel it’s necessary to remove the efflorescence we would advise you to scrub the concrete with a stiff broom and a bucket of soapy water. Avoid using a power washer on block paving (unless you know what you are doing) because if it’s not used correctly, it can wash away the sand below the paving which will cause even bigger problems and require a visit from a professional to repair the laying course. Cleaning is however just a short term fix and you will find that within a month, the efflorescence will return.



SE Landscape Construction are a landscaping & driveway contractor based in Essex. We specialise in paving including block paving driveways in Essex and patio paving in Essex. Our experienced team of craftsman have the knowledge and skill to transform your home whilst adding up to 15% to your property’s value. If you live in the Essex area contact our friendly team today on 01245 80 71 80 to book your free consultation.



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