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Mould problem bathroom walls - best fix ?

Discussion in 'Decorating and Painting' started by NickCurtis62, 5 Sep 2021.

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  1. HERTS P&D

    HERTS P&D

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    I would like to know when it was last decorated, 1974?

    As it looks like there hasn't been much maintenance to the property.

    Andy
     
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  3. RandomGrinch

    RandomGrinch

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    Insulation would be good, but make sure you also add a vapour barrier (or foil tape the kingspan joints) to avoid interstitial condensation and future issues with the wall.
     
  4. RonnieE

    RonnieE

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    Removing the mould is one thing but the challenge is to stop it returning - i.e. sorting the cause not the effect.

    Mould needs certain conditions to grow so if you can tick as many of these off as possible it will help prevent it returning.

    Mould likes...

    - Moisture / humidity (obviously more common in a bathroom)
    - Warmth (that usually exists in a house)
    - Lack of air movement / ventilation (extractor fans and windows open regularly)
    - Lack of direct sunlight
    - An organic material to grow on (mould especially likes plasterboard) as a food source
    - Lack of disturbance (usually cleaning)
    - The presence of spores (obviously you have that)

    You don't have to sort all those things but as many as you can will help.

    Hope that helps.
     
  5. wallcoatingsbloke

    wallcoatingsbloke

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    Hi, you cannot cure damp and mould internally. Mould is caused by water getting into the house via the exterior walls. Mould is caused by water. If you block an area inside the house, the water will simply find another spot to emerge and then you are back to square one.
    The only failsafe way to stop mould coming into your home is to treat the EXTERIOR walls with a weatherproof wall coating, available from many companies across the UK.
     
  6. Harry Bloomfield

    Harry Bloomfield

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    That would seem a bit unlikely to help the OP, unless the moisture is entering via the outside walls. Most often, the moisture is generated from inside the home. Further, wall coatings tend to lock-in any moisture in the fabric.
     
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  7. RonnieE

    RonnieE

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    Sorry but that is not true. In my experience (as someone who does mould remediation work professionally) mould caused by water coming in via external walls is fairly infrequent. It is much more commonly caused by internal environmental conditions (condensation, leak etc) coupled with the right environmental conditions for the mould to flourish (poor ventilation being very common). On many occasions you can resolve mould problems internally by improving the environmental conditions to a situation where mould does not grow.
     
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  9. JP_

    JP_

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    That's not right. Most bathroom mould is caused internally, from condensation. The solution is to insulate the walls (doesn't have to be loads, just enough to stop condensation), improve heating, and use an extractor fan, and have a trickle vent in the window.
     
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  10. RandomGrinch

    RandomGrinch

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    A bit controversial for your first post in eight years! :)
     
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  11. JP_

    JP_

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    anybody would think he was bias towards external wall coatings as a solution
     
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  12. Harry Bloomfield

    Harry Bloomfield

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    He is here to promote wall coatings.
     
  13. Bonni

    Bonni

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    Just wash the mould off with bleach and water. Then emulsion. Any staining that comes through, put a stain block on. You could use oil based undercoat, or Zinseer BIN 123, or a product that says stain block.

    But if you don't improve the heat and ventilation, I suggest you buy loads of bleach, stain blocker and emulsion.
     
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  14. RonnieE

    RonnieE

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    Using bleach is genuinely not a good idea - it can do more harm than good and only provide superficial benefits. A specialist antimicrobial mould product is far preferable.
     
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