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Posted: Sun Jun 22, 2003 11:45 pm
by lewis
Help ..I had a new paver walk way installed about 2 weeks ago. I now have white stains on alot of the blocks in the center of them.
How do you get rid of them and what are they from
Thanks anyone in advance
Posted: Mon Jun 23, 2003 2:34 pm
by 84-1093879891
Sounds like efflorescence, which is not uncommon on new concrete pavers. Is it a dusty, white, mildew-like deposit on the surface of some, but not all, the blocks?
If you look at any manufacturers catalogue, they all have a clause in the small print absolving them of any responsibility for effloresence, and, to be fair, there's not a great deal thay can do about it, as it's a natural phenomenon with most concrete products, and it occurs with clay pavers, vertical masonry, concrete castings etc.
It will disappear in time. Usually, a few weeks out in the summer rain will wash them clean, but there are some cases where the efflorescence has persisted for several months. There are products that claim to shift the deposits, which they do, but they are a temporary fix, and the eff. will be back again in a couple of weeks.
As your paving is new, give it at least 3 months to see if the apparent 'staining' gets any better, disappears altogether, or becomes really 'heavy'. In 95% of cases, it will have disappeared completely by the time we get to September. :)