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Efflorescence?

Posted by Darren on September 6, 2020 at 1:57pm

Hi all

We had a new honed smooth Indian sandstone patio layed. After around a week, we noticed blotches on some of the slabs. Is the just the salts and minerials coming through or something else?

Someone mentioned this usually happens if they haven't been laid on a full bed, however they have. Also you'll notice that not all slabs are effected. 

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  • Tommy September 7, 2020 at 8:50am

    Full bed is important for stability and prevents frost damage but efflorescence is usually caused when SBR primer hasn't been used on the back of the flag.   

    • Darren > Tommy September 7, 2020 at 9:57am

      Thanks Tom. Any ideas what it might be? I've never come across it before. Could it be the actual slabs?

      • Tommy > Darren September 7, 2020 at 11:12am

        Not sure what causes it.  I think it's maybe the mortar sucking moisture out of the slabs as it goes off.  I have seen it before on Indian stone paving.  Looks quite bad in the images you have posted though.  Maybe see what the supplier says.

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