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We get queries from time to time from homeowners concerned about the efflorescence on their walls. Sometimes these walls have been rendered, while at other times they are raw masonry. In all cases the powder is caused by leeching salts contained in the raw materials. So there’s little point in trying to Find the Builder who built the wall – 
although you could help avoid the problem by employing a professional bricklayer, such as those whose services we advertise here.
The ground salts are contained in natural products like sand, clay and stone. When water penetrates the material it carries the salts out to the surface. There the water evaporates leaving the characteristic white deposit behind. This can largely be avoided by preventing water intrusion and applying a surface sealer. When you get Bricklaying Quotes from Mr-Skill, you should discuss such matters and agree solutions.
• Brushing the efflorescence away is only a temporary solution, although theoretically all the ground salt will leech out in time.
• The permanent solution lies in preventing water from entering the material in the first place. If it is 
intruding from the outside, then this is relatively easily cured. If the wall is a retaining one though then a big job lies ahead as every London Builder knows. That’s because a leak is only stopped at its source, and that’s behind the wall!
• If you are lucky, then the problem is the result of a permeable surface on the weather side. The solution in this case is to allow the wall to dry out, thoroughly brush the surface clean, and then apply a proprietary clear sealer.
The Bricklayers advertising on Mr-Skill are properly trained and know how to mitigate against irritating efflorescence. Their rates are generally lower too, because they compete among themselves for work. There is no charge for requesting quotes from us and no obligation to accept them either. Doesn’t that sound like the perfect consumer-driven solution you’ve been looking for?