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Patches on new plaster

Discussion in 'Your Projects' started by Muj, 21 Apr 2020.

  1. Muj

    Muj

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    Hi everyone,

    I had my house skimmed a couple months back and have some marks coming through on one specific wall - detached house Built in approx 1935, top floor bedroom on exterior wall.

    before the new skim was done this wall was a tad weird with old plaster just coming off. In some parts it also looked dark, being new to all this I didn’t think anything of it and the plasterer didn’t mention anything either.

    I wanted to know if I should be worried so have attached a few pics.

    all help will be great!

    thanks in advance

    95ABCE8D-E606-4776-BEB5-CEF5830D2C51.jpeg E164516D-BE17-444B-AFD9-DA7E83B89999.jpeg 7682C9FB-9019-408E-BBA9-E739FC566C9E.jpeg
     
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  3. GlenBoy

    GlenBoy

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    If you rub it is it like white powder? It might be salts coming out. I had something like that at mums built in 1913. I had to have the damp course done. It would also be worth having a look if its an outside wall to see if the water is running away or the damp course is not bridged. Mums had render bridging it. Someone else may have some other ideas....
     
  4. Muj

    Muj

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    Thank you for the reply Glenboy,

    I’ll rub those parts next time to see if it’s powdery.

    can I ask what you mean by damp course? Sorry I’ve never heard this term before.

    Is it expensive to get done? Easy to do? Does the plaster need to be broken off the wall again?

    Apologies for all the questions
     
  5. bennymultifinish

    bennymultifinish

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    hygroscopic salts. look it up
     
  6. Muj

    Muj

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    Oh god, that doesn’t look good, what do I do to fix it? :(

    seems like that plaster needs to be broken off and re done? I’d rather do anything I need to now before I start painting it
     
  7. bennymultifinish

    bennymultifinish

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    it’ll not go away. the only real solution is to get back to the brick/stone and re-render using a salt inhibitor. or dryline and plaster the wall. there are coatings available that claim to cure the problem .I can’t comment on how effective they are.
     
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  8. Muj

    Muj

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    So the only real fix is to break down to brick, use a salt inhibitor then plasterboard and plaster the wall?
     
  9. bennymultifinish

    bennymultifinish

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    no , sorry , you could leave it as it is and batten and board the wall over it. preferably leaving a potential for it to vent behind and breath.
    or
    take it back to brick and re render with salt inhibitor.
     
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  11. bobasd

    bobasd

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    OP,
    knock off back to brick and re-render with a sand and lime render mix.
    dont use plasterboard or batten and board.
    batten and board, like D&D that has "venting", also provides a chute behind the boards for flame and esp smoke to shoot up to the next floor.

    why not post pics of the whole wall and the wall outside?
     
    Last edited: 22 Apr 2020
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  12. Muj

    Muj

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    Hi Bobasd please see more pics below,

    I’ve sanded it down a little too see if it makes a difference. The external image shows a chimney running along the wall, not sure if this is causing the problem.

    the fireplace is in the front room below the offending wall (offending wall in master bedroom)

    9107876B-83B9-49B1-89F1-61CEEC0A3A51.jpeg 30E01256-52C9-4046-99AD-1E2915136D8A.jpeg 580C9C18-FDE3-4407-80F7-3C045B838B25.jpeg B3542CEB-B756-41B2-A819-58BFA1EE59B2.jpeg
     
  13. Alastairreid

    Alastairreid

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    Was there ever a fireplace on that wall?
     
  14. Muj

    Muj

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    I’m not sure Alastair, I’ve not removed anything since I bought the house 6 months ago. So not sure if previous owners did :/
     
  15. bennymultifinish

    bennymultifinish

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    sand and lime ? on brick ? no!
    op stated the room is at top floor, your point about ‘chuting smoke and flames’ is nonsense im afraid.
     
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  16. bennymultifinish

    bennymultifinish

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    judging by the floorboards , doesn’t look like theres ever been a hearth or fireplace there.
     
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  17. JohnD

    JohnD

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    are there any chimneypots? How many?

    How many fireplaces were there downstairs?

    It looks to me wide enough to have had two flues.

    Sometimes housebuilders will build things, such as a chimney, but make you pay more if you want extras, such as a fireplace, added.

    If there are flues that are not ventilated top and bottom, this will cause condensation inside. It is easily remedied by adding an airbrick near the top and bottom of each flue.

    Sometimes homeowners close off airbricks.

    You may need to get up high to see if there is good lead flashing preventing rain off the roof running onto the brickwork.

    Look at neighbouring houses built in similar style
     
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