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Crumbling mortar - advice please.

  • 31-05-2021 3:29pm
    Registered Users Posts: 95 ✭✭ Robert Allen

    If anyone could advise me here id appreciate it.

    I noticed a few horizontal hairline cracks in external wall at radon level. I removed some of the plaster and i see that the mortar between the block and radon barrier is soft and crumbling about 20 - 25mm into the joint.

    Can anyone tell me what the cause is here? There doesnt seem to be rising damp and the footings/ foundation dont seem to have sank.

    I dont know if the mortar got weak and caused the plaster to crack or if the plaster cracked first for some reason and water got in to damage the mortar.

    Has anyone seen this happen before?

    Thanks all.

    Advice is appreciated.

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