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Indian sandstone turned black

Posted by Edward Verity on January 16, 2012 at 7:20pm in Landscaping

Can anybody help me as to why a patio I installed in Godalming in June 2011 has some serious colour defects?

I did every thing correctly from the sub base to the sand and cement ratio right through to the pointing!!

I recently received an email from my client with photos of the patio which was"raj blend" Indian sandstone, 3 of the 300 x6 00 slabs have turned a horrible brown/muddy/black colour which have also made a mess of my nice pointing!

I was so shocked to see it as i take alot of pride in my work to ensure a great finished product!

I have contacted my local builders merchant and they are sending a rep out to investigate at some point but would love to know if anyone else has experienced anything similar.

regards

Edward verity

  

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Replies

  • RICHARD BICKLER January 16, 2012 at 7:38pm

    Edward, 1 possibility could be the slab delaminating? another could be the iron ore rust coming out of the slab possibly due to the cement and slab capilary action, do you pva/slurry cement seal the backs of the slabs at all? there is a product called derux we used to use to remove small amounts of iron ore from the slabs but on this occasion I think an uplift and re-lay may be required here on these slabs, I could be totally wrong but offering some guidance.

     

  • Edward Verity January 16, 2012 at 7:52pm

    hi Richard,

    thanks for that would you suggest i use "derux" in the future then ?

    i use SBR when laying coping stones or steps to ensure a particularlly strong bond are they simular products?

    regards

    Edward Verity

     

  • RICHARD BICKLER January 16, 2012 at 7:58pm

    Its a hard one to call I got the derux from my nat stone supplier about 5 years ago and havnt really used it much since as I try and set aside and not use the stones that are showing a large amount of differing colours to the rest..

    you could always google it,, other small stains are removed by using a poultice to (ie something that draws things out- once again google.

    re sealing backs of slabs we with use a white cement to a creamy texture (depending on what slabs) or a pva/opc mix to a creamy consistency to stop possible capilary action and to give extra bonding strength.

    Sorry i can't help more than that

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