Black mould underneath kitchen wall paper

[dog-man]

I am in the process of redecorating and renewing my kitchen.

I have taken the old woodchip paper off the walls and found several patches of black mould on the walls.

What is the best way to get rid of this?

I don't want to just wash the walls and have it come back.

Steve.....

[dog-man]

Just to add.......

I believe the mould has been caused by condensation from within, rather than any damp penetrating the walls. I am 99% sure that is not happening here!

Steve..

[Phil L]

where on the walls have you found it? - are they internal or external walls?

mould only usually grows where damp occurs, eradicate the damp and the mould will follow suit. If it's an exterior wall, check pointing outside, also any signs of water ingress from other sources - pipes, gutters etc, if it's above 3ft from the floor it can't be rising damp, if it's high up the walls, it's a strong possibility that it's condensation - an extractor fan is usually required...more info required, but you are right in your assumption that simply washing it off won't work

[Phil L]

I was already typing and didn't see this...any extractor fans or cooker hoods?

[Cicero]

=============================== Are you sure that it's not just staining (mould staining) left over from an earlier period of decorating? Most wallpaper pastes are now 'fungicidal' but a previous generation of pastes were not. You could try a fungicide to see if the stains disappear - possibly a garden fungicide like 'Cheshunt's Compound'.

Cic.

[Dave]

Try Dettol Mould and Mildew remover. It has worked for me in the past. As to how to prevent it coming back, as others have said, you need to find out how it got there in the first place. My money is on the old type wallpaper paste, as it was found under the paper. Another way it could have got there is that the person who put the paper on the wall did not get rid of it before papering.

Dave

[dog-man]

Thanks for the suggestions.

I am pretty sure that the cause is condensation. I shall endeavour to either fit an extractor, or take the hob extractor out through the wall when refitting the new kitchen. I assume that a hob extractor will work similar to a stand alone extractor?

There was no insulation at all in this house when I purchased it, but little by little I am adding it where I can. The kitchen will be having cavity wall insulation soon.

Already insulated the flat roof when I had it renewed.

Steve..........

[fred]

In article , dog-man writes

When I was clearing something similar I used Sandtex (Masonry Preparation) Fungicide. I don't know if it's still available but it claims to be Sodium Hypochlorite 4.6% which is just bleach, have a gander at some bottles of bleach & check for the same ingredient.