Mould

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Hi all I wasn’t sure where to post so hopefully this is ok. I’m in the process of decorating bedrooms. Both g drools on the front of my house have some sort of cupboard built into the room. In the one room we are knocking this down while emptying it I have noticed some mould where the wall meets the ceiling we are having this room plastered but I don’t want mould coming back. I went into my attic last night as while it was very windy out I couldn’t feel any breeze I suspect this means the insulation needs pulling back from the eves, could this be what’s causing the mould? Or ois there another issue I should look into. Thanks so much I should add in the second bedroom there was a media wall built when we took this down there was some mould there too in the same place eg where the wall meets the ceiling
 
Lack of ventilation is key, and this includes having windows open just a bit in bedrooms all year round.

Damp and then mould always collects in the coldest part of a room and we humans exhale moisture as we sleep
 
A few things

Ventilate the void so thoroughly that moisture cannot accumulate there

Or

Seal it from the room so thoroughly that humid air from the room can't get in

Or

Warm it sufficiently that it is not prone to condensation and any damp will evaporate and escape. Waste heat may be generated from your electronic equipment if it is used daily.

Cavity wall insulation helps keep walls warmer.

Outside air is cooler and contains less water vapour than indoor air, so ventilating to the outside is better.

Bedrooms tend to be humid and need to be well ventilated every day.

You can do it by opening the bedroom window every morning when you get up and throw back the covers (the bedding absorbs moisture overnight, and needs airing).

If you have windows with a trickle vent, leave it open and this may be sufficient.
 
Thank you. I have some celotex boarding would that work in the voids behind the media wall? Would I have to do the whole void area or just the top section where the mould was previously?
 
A vapour barrier should be fitted on the room side of the insulation, so that no humid air from the room can get behind it.

If your board has Aluminium foil bonded to it, that would do but you have to seal the joints with matching tape.

If condensation is forming on the ceiling, go up snd see if that part of the ceiling is well insulated.
 

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