How to sort this mouldy wall before dry lining

budgemook · 23-03-2025 08:19PM #1

Hi,

Today I decided to pull down the old built in wardrobes from our main bedroom. They were on the exterior, east facing, wall and probably there for decades (I'm only here a year). I was expecting that there might be mould but what I found seems to be almost uncleanable. I've given it a quick spray of HG mould spray but it doesn't seem to have done much.

I am not sure what to do with it to be honest. My plan is to put cosy board on this wall and then a built in wardrobe on perhaps 1/3 of it, not the whole wall. If I kill it with bleach or vinegar could I just throw the cosy board over it? Or does it need to be fully cleaned for it to stop growing again?

FWIW I am pretty sure I've addressed / mitigated the root cause - I had some mould in another room which is gone and has not come back

greasepalm · 23-03-2025 08:27PM

Wonder if you have a wall or roof breach of dampness which needs addressing first i would imagine.

budgemook · 23-03-2025 08:34PM

https://www.boards.ie/discussion/comment/123290954#Comment_123290954

when I moved in, the roof verge pointing (I think that's what it's called) was all fallen out. Is something like that what you mean? I got that repaired soon after I moved in.

loyatemu · 23-03-2025 08:55PM

Remove the plaster maybe if you're planning to dry line it anyway?

Charlie DIYte on YouTube has some good videos on internal insulation.

10-10-20 · 23-03-2025 09:01PM

The mould spray is just to kill off the spores and lighten the colour by bleaching. I'd treat it again then leave it dry off fully. Just make sure that the warmboard has an integrated vapour control layer and fit it using adhesive foam instead of dots and dabs.

Then just continue to manage the RH in the house to keep the damp at bay.

budgemook · 23-03-2025 09:19PM

https://www.boards.ie/discussion/comment/123291041#Comment_123291041

Thanks, had a quick look there. I think cosy board is probably the best fit for me.

https://www.boards.ie/discussion/comment/123291067#Comment_123291067

Thanks, will do exactly this. Most warm/cosy board brands have this vapour control layer right?

10-10-20 · 23-03-2025 09:33PM

https://www.boards.ie/discussion/comment/123291126#Comment_123291126

Yes most have the VCL, but some have a paper face.

How to sort this mouldy wall before dry lining

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