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I have some deep holes such as those in the pics and want to fill them up. I’m sensitive to smells and vocs etc so I prefer to use lime. I ha e heard that lime is breathable and could let water vapour through which could feed any mould inside the wall.

  1. assuming the source of the mould cause has been removed. If u filled these holes with lime could mold spores/gasses travel through the lime?

  2. conversely could water vapours travel through lime and feed mould on the inside?

  3. I’m not sure what my existing walls are made of, however I assume they have some level of breath ability, perhaps from the pics you can work out what they’re made off. If I remember correctly there is solid brick inside and It may be covered in cement but I’m not sure. Somebody told me your walls would have to be breathable otherwise damp and mold would have to develop. Is it fair to say that whatever my walls are made off using lime would make no difference the rest of the wall is probably as breathable as lime therefore I may aswell use lime?

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    Could you add a wider shot to give some context? This looks like an exterior wall, but what appears to be vinyl flooring indicates that it's an interior. Is this in a finished basement or a ground/above ground floor?
    – FreeMan
    Sep 18 '20 at 15:42
  • @FreeMan sorry I am unable to get a wider shot at the moment. I am on the first floor and This is the inside of my kitchen. Sep 18 '20 at 19:04
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When you say "lime" I assume that you mean some sort of mortar or plaster.

I see the brick or stone in the wall and some kind of material that has been troweled in around the drain pipe.

To answer your questions :

  1. Gasses could move through unsealed mortar very slowly, but mold spores would not.

  2. Water vapor would not travel through the mortar by osmosis, but it could wick standing water farther up into the wall. Seal the patch if it does.

  3. If you don't introduce moisture through your patch, there's no problem with it being the most permeable spot in your wall. A mortar based patch is probably ideal.

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