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Question DetailsAsked on 12/5/2015

bluestone installed by person given A in list has heavy efflorescence in 2 weeks He says he can't do anything

Within 2 weeks of installation heavy white deposits started appearing on each of the bluestones. He came back and powerwashed the stairs. His people said they used acid, though I did not see this. When it dried the white is worse than before. We paid $4000 for this work - we just don't want it to have to start again.

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Common for bluestone - caused by minerals in the stone dissolving in water and them evaporating at the surface, same as the cement laittance on concrete and brick walls. Depending on rock type, acid may or may not be the right treatment - some types that just dissolves more mineral and makes it worse, like with calcium sulfate for example.

Need to find out from manufacturer what type of efflorescence your particular variety of bluestone exudes, the proper type of remover, and also if you want to avoid it in the long run (mostly) what type of deep-penetrating sealer needs to be used - and reapplied every year or two, because bluestone is a high-maintenance product, like marble or many other types of rock which would normally never be considered for construction use if they did not look pretty. Unfortunately, you will never get rid of the effect (especially outdoors) unless the stone is totally sealed in, like under a plastic sealer, which is then renewed quite frequently as it wears.

Answered 4 years ago by LCD

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