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Lime mortar outside / Cement plaster inside - causing damp?

Discussion in 'Plastering and Rendering' started by odilon, 8 Feb 2014.

  1. odilon

    odilon

    Joined:
    29 Jan 2008
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    Location:
    London
    Country:
    United Kingdom
    We recently did a full rehab or our 1890's house in South London, including removing old cement render from part of outside wall, returning all mortar to original lime mortar (some had 1" of cement mortar on top), and new plaster on inside walls. A couple of the walls are now having some stubborn damp problems, and I fear the combination of lime mortar outside and non-lime plaster (I assume the original had been lime-based) inside is causing problems.

    Can anyone advise on what might be happening?

    Thanks!
     
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