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Removing cement-based repointing

Discussion in 'Building' started by xeres, 6 May 2019.

  1. xeres

    xeres

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    Hi all

    Looking to remove the ugly cement pointing that will damage the stonework of an 1860s Terrace house.

    Pointing has been thickly applied over a traditional lime pointing. This will cause the stones to spall and damp issues within the property.

    Much of the pointing is already loose so is easy to chip off. Some of it has been done recently and is stuck fast. Interested if anyone has any tricks on removing this without damaging bricks. My obvious concern is the effect of acid on the stone.

    Many thanks
     
  2. ^woody^

    ^woody^

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    You need to avoid common cleaners based on hydrochloric acid, as this can cause staining and is too harsh for many natural stone. Other than that, do a search for stone cleaning chemicals - if you know the actual stone, that will help.
     
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  3. xeres

    xeres

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    Thanks. Trying to upload pictures but it doesn’t actually post them which is annoying
     
  4. stuart45

    stuart45

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    Limestone would be the worst as the acid will react more with calcium carbonate.
     
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  6. xeres

    xeres

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    D90BFB90-1F20-4C8E-A636-5D39F811993C.jpeg

    Pic showing the newish cement mortar in left. To the right is old cement mortar over original like mortar, which has evidently failed and is easily chipping away, mostly with me pulling using my finger.

    7EEDCCD6-EEAC-4C1F-AF86-C123960ADEF3.jpeg

    Anyone who can tell me what stone it is?
     
    Last edited: 9 May 2019
  7. ^woody^

    ^woody^

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    Looks like sandstone
     
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  8. lostinthelight

    lostinthelight

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    Running a narrow disc along the centre of the pointing then chisel from the edges towards the cut, works for me most of the time.
     
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  9. xeres

    xeres

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    Super helpful post, thank you.
     
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