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Yellow stains on chimney breast

Discussion in 'Plastering and Rendering' started by TheCyclingProgrammer, 21 Apr 2015.

  1. TheCyclingProgrammer

    TheCyclingProgrammer

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    We are about to have a lot of replastering done on our house. We moved in a month ago.

    I'm a bit concerned about some yellow stains on the chimney breast in my daughters bedroom. We are going to have the walls skimmed but I'm worried that the stains will keep coming through. I've tried to get a photo it's hard to get a good light.


    The chimney breast is blocked up downstairs and upstairs and there are cents in both rooms, although the vent in this room was shut. I've since opened it. We have also had the unused chimney pots capped with C caps.

    Is this anything to worry about? Is there anything we should do before its skimmed over?
     
  2. TheCyclingProgrammer

    TheCyclingProgrammer

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    Maybe a better photo. You can just make out the yellow patches. The wall doesn't feel or smell damp.

     
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  4. ree

    ree

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    OP, are you still there?
     
  5. TheCyclingProgrammer

    TheCyclingProgrammer

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    I'm still here.
     
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  7. ree

    ree

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    Its possible that your flues need sweeping - if you have never swept them then have them swept. You might have to open up at the fire place positions in each chimney breast to gain access for sweeping
    .
    The flues might be lacking thro ventilation. Unswept soot could be mixing with unvented air to create chemical reactions.

    Chemical reactions might be bringing contamination thro the brickwork to the decorated surface ie. your yellow patches.

    Often, with contaminated plaster, after sweeping and ventilating the flues, the next course of action is to hack off the c/breast (gypsum?) plaster, and replace with render in lime and sand.

    The flaunching on the stack(s) and the condition of the stacks must be examined for possible water penetration.
     
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