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PRO

matching mortar colour to original spec

I have to re point the gaps between some paving stones in a courtyard after some was blasted out by a firm carrying out pressure washing . 

Most of the existing mortar left is sound so its just random areas that need doing but in a prominent place , The original colour is a light buff colour and i need to achleve the same spec as my client is very exacting . 

Local builders merchant was very helpful and pointed me in the direction of ever build mortat tone and a bag of mortar but my question is how easy or hard are the two to mix together to achieve the exact colour . 

what ratio of mortar tone achieves a lighter colour . ? 

Thanks in advance 

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Replies

  • its trile and error you will have to do test samples making notes of the mix then let it dry then compair the results with the exsisting 

  • its trile and error you will have to do test samples making notes of the mix then let it dry then compair the results with the exsisting 

  • PRO

    As Dave says it's trial and error.

    You're not clear if a dye has been added to the original mortar.

    In my experience its not often that a dye is used so then it comes down to the sand used. Local builders merchants will have a range on offer such as orange or yellow or where i am red and most builders/landscapers will use sand that is easily available from these local suppliers.

    Sounds to me that it could be a relatively lean mix with a yellow or orange sand. I see plenty of houses done 5:1 where the mortar dries a buff colour.

    Check if the existing mortar has got any grit in it. I use 2 sharp:1 soft:1 cement but plenty of folks point using just soft building sand.

    Got to look for the clues in the existing mortar and then go from there with a series of trials. Colour you describe leads me to think it will be more like a 4:1or 5:1 as 3:1 comes out whiteish/grey when its dry.

    Best of luck and don't forget to add a charge to the quote for the time and materials taken to establish the correct mix.

    • PRO

      Thankyou David & Edward for your advice .

      I was thinking along those lines of trial and error . 

      Its such a small amount i went with what seems to be the quickest fix of mixing the mortar tone with mortar . 

      It is a sandy yellow tone which i am trying to achieve , the existing mortar which has come out is smooth and brittle like plaster , not sure if it throws up any clues . 

      I will do a few mixes beforehand and see out it goes .  The other question i should have asked as David suggests , Will a wet mix dry to a lighter shade or darker . ? 

  • PRO

    As has been said the sand makes a big difference.i bet the original was laid with a locally available sand and no colourants were used.

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