1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Indian sandstone patio stains/marks

Discussion in 'In the Garden' started by James McFadyen, 15 Feb 2021.

  1. James McFadyen

    James McFadyen

    Joined:
    15 Feb 2021
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi all,

    I had an Indian Sandstone patio laid last year. Everything looked fine to start - we left it around 4 weeks and then sealed it whilst there was good weather.

    After sealing it, we saw that many of the slabs had these strange markings on them which weren’t previously visible before the sealer was added. It looks as though some oil or adhesive may have been spilt on them. Some of the patterns are almost symmetrical.

    Any ideas what could have caused this and how to remedy? Currently the company I used to lay the patio says as it was not visible when they laid the patio, it’s not their issue. I believe the slabs were a bad batch but struggling to prove it!

    Any help would be greatly appreciated!
     

    Attached Files:

  2. Sponsored Links
  3. KenGMac

    KenGMac

    Joined:
    24 Aug 2010
    Messages:
    3,888
    Thanks Received:
    754
    Location:
    Ayrshire
    Country:
    United Kingdom
    James McFadyen, good evening.

    Can I suggest you use the "Search" function at the top right of this page.

    Type in Stains on Indian Sandstone [or similar] and you will find a load of such questions and answers.

    Ken.
     
  4. James McFadyen

    James McFadyen

    Joined:
    15 Feb 2021
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi KenGMac,

    I’ve already searched for this and multiple variations of it but can’t find much, and certainly nothing that looks like the stains I’m seeing on my patio.

    If anyone has any suggestions on what has caused the stains I’d be really appreciative.
     
  5. KenGMac

    KenGMac

    Joined:
    24 Aug 2010
    Messages:
    3,888
    Thanks Received:
    754
    Location:
    Ayrshire
    Country:
    United Kingdom
    James McFadyen, good evening, again.

    Understood, as a question? how did you apply the sealer? was it poured from a can [or similar]?

    The markings "look like" liquid spill. ?

    Please do not think I am having a go at you but the patterns appear as stated above??

    Ken.
     
  6. blup

    blup

    Joined:
    5 Nov 2007
    Messages:
    1,861
    Thanks Received:
    317
    Country:
    United Kingdom
    Looks like some sort of salts/efflorescence from within the porous material that is the sandstone.

    If you purchased the materials direct you can take it up with the supplier. If the builder paid, it is his responsibility.

    Blup
     
  7. James McFadyen

    James McFadyen

    Joined:
    15 Feb 2021
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    I applied the sealer with a roller so it was evenly distributed. It’s also only on some slabs and not others - I think if there was a problem with the sealer or the method of application it would be on most/all of them. The patterns appear almost symmetrical on some slabs which makes me think something was spilt on them when they were packed but obviously no way to confirm this.
     
  8. Charlie George

    Charlie George

    Joined:
    16 Mar 2018
    Messages:
    734
    Thanks Received:
    97
    Location:
    Manchester
    Country:
    United Kingdom
    I agree with Ken here it looks like bleach/acid or something similar,they look like Kandla grey which i have and didn't seal as i find them easy to clean without,which sealer did you use,as some are better than others ?
     
  9. James McFadyen

    James McFadyen

    Joined:
    15 Feb 2021
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    I used Lithofin Colour Intensifier sealant which was recommended to me by the landscaper who laid the patio.

    I can confidently say that the sealer wasn’t spilt, but believe that something else may have been, and the sealer simply made it visible.
     
  10. Sponsored Links
  11. Charlie George

    Charlie George

    Joined:
    16 Mar 2018
    Messages:
    734
    Thanks Received:
    97
    Location:
    Manchester
    Country:
    United Kingdom
    That is a good(and pricey) brand,so using a cheap one can't be blamed.post your pics on paving expert.com but it does look like a spill.
     
  12. KenGMac

    KenGMac

    Joined:
    24 Aug 2010
    Messages:
    3,888
    Thanks Received:
    754
    Location:
    Ayrshire
    Country:
    United Kingdom
    Just as an outsider here.

    There has been a lot of posts on the board about discoloration of this material??

    It is almost as if there has been some sort of chemical used during production that manifests itself when sealant is applied??

    Ken.
     
  13. Charlie George

    Charlie George

    Joined:
    16 Mar 2018
    Messages:
    734
    Thanks Received:
    97
    Location:
    Manchester
    Country:
    United Kingdom
    Hope they have toilet facilities for those kids in the quarry;)
     
  14. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    74,980
    Thanks Received:
    4,347
    Location:
    Crossgates, Europe
    Country:
    Cook Islands
    Indian Sandstone is quarried and sawn, it is not a concrete product. It does show patterns of fossils in the surface, but not like the OP's problem.

    I have some and it is fine, I insisted on a deep MoT base, and a good fall, brick pavers edging, it looks great.

    (my neighbour laid his flat, with no drainage, and it is dirty, discoloured, and black with mildew)
     
  15. blup

    blup

    Joined:
    5 Nov 2007
    Messages:
    1,861
    Thanks Received:
    317
    Country:
    United Kingdom
    Recent batches (last few years) of indian sandstone have been reported as much poorer quality, more porous.

    Blup
     
  16. Mike13

    Mike13

    Joined:
    19 Nov 2005
    Messages:
    154
    Thanks Received:
    19
    Location:
    Surrey
    Country:
    United Kingdom
    Did the builder use pva? slurry? on the back, and might have poured it on before spreading it?
     
  17. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page