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repointing old bricks colour not matching

Discussion in 'Plastering and Rendering' started by mane1034, 23 Aug 2018.

  1. mane1034

    mane1034

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    Hi

    my house is 1940 build and require some repointing in ceratin areas only.

    i start repointing back wall using following mix

    1 part cement
    5 part sand
    1/2 part lime

    however i am struggling to matching pointing colour with existing pointing.

    new pointing looks more greenish.

    any help pls


    IMG_8384.JPG
     
    Last edited: 23 Aug 2018
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  3. Charlie George

    Charlie George

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    If using cement you need to use White cement(snowcrete) and if sand is too red try using a washed sand instead, try a small mix as sample and give a day or two to dry.
    Jim
     
    Last edited: 23 Aug 2018
  4. stuart45

    stuart45

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    Are you putting any cement in?
     
  5. mane1034

    mane1034

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    my mistake just corrected it.

    1 part cement
    5 part sand
    1/2 part lime
     
  6. stuart45

    stuart45

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    Are you sure the original is not a lime mortar. In the 40's some builders were still using lime mortar, others were gauging cement into the mix.
     
  7. Astra99

    Astra99

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    Don't forget that cement produced at different works can be vastly different colours when dry. For example, Blue Circle's Westbury cement was very light in colour, but that produced at Northfleet works was noticeably darker. If I remember correctly, Ketton Cement used to have a greenish tinge. As Charlie George said (above) Snowcrete might be your best bet.
     
  8. datarebal

    datarebal

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    it needs a bit of a rake out before pointing, that is one of the reasons your struggling to get a nice finish.
    forget the cement, use N H lime and an aggregate of suitable colour which should give you a good shade and help preserve your bricks.
     
  9. mane1034

    mane1034

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  11. stuart45

    stuart45

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    Your lime is not NH.
     
  12. mane1034

    mane1034

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    Do i need lime 3.5 or 5 as it seems differnt ones available?
     
  13. darrington

    darrington

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    The thing is, although you can hopefully get it to look similar, you'll never get it to look exact. The same applies to patching roughcast, render etc, or any other patching job, where the original was done years earlier, with materials from that era,
    The only way to get an exact colour, would be to rake out, and repoint the whole lot, using the same "ACCURATELY MEASURED" mix ratio, same colour sand etc. A lot more work I know, but if it's the finished look you're after,. then well worth it.
     
    Last edited: 24 Aug 2018
  14. mane1034

    mane1034

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    I understand i will not be able to match colour 100%


    Can any one provide link which NHL TYPE i have to buy. Also
    What should be the mix ratio with sand

    Thanks
     
  15. stuart45

    stuart45

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    NHL 3.5 mixed at 3/1 sand/lime
     
  16. datarebal

    datarebal

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    I would go with that.
     
  17. datarebal

    datarebal

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    No
     
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