Serious Mold Issue in Master Bedroom

[Harry Bloomfield]

All together prevented by adequate ventilation being given, not drying clothes on the radiator and having an extractor or opening a window in the bathroom.

We are well sealed up, never open windows in winter, yet we have no mould anywhere. How do you account for that? All we do, is ensure no excess moisture is generated in the home, and what there is - ensure it is extracted it at source.

If it was any good everyone would use it instead of 100mm+ kingspan. 3mm of polystyrene wallpaper doesn't defeat the laws of physics that thicker proper insulation has to adhere to

That's a little harsh - Every little helps, even a little is better than none at all.

 

[Murdochcat]

Not much, should do. Will start opening them on a morning for a bit.

Why the morning? At night when you are asleep your breath adds moisture to the air which then settles in the colder parts of the room

Ventilate all the time

 

[NorthWest1]

I think you have to do more than just wipe away the existing mould, it has to be de-contaminated, the minute spores can lay dormant for years and come back again.
In our house, cavity wall, we rarely have any windows open in winter, no extract fan at all in bathroom !! ( never got round to putting one in ) and there's sometimes condensation on windows, but there's never been any mould at all.

If I was you, I'd look into properly cleaning/killing-off the existing mould, fit an adjustable air vent and make sure there's no damaged guttering or brickwork around the windows. See how it goes.

 

[aveatry]

Not much, should do. Will start opening them on a morning for a bit.

Open everything every few days before you put the heating on. Every few days I have every door and window open for about 5 mins swap and clean and clear the air. Even when it's wet outside the air is still dryer than it is inside with everything tightly shut up

 

[Harry Bloomfield]

Even when it's wet outside the air is still dryer than it is inside with everything tightly shut up

I cannot believe that to be correct, here is my log, for the past couple of days.... We never open windows in winter.

The green line is the indoor humidity, the brief rises, are the result of taking baths, the sensor is across the landing, from the bathroom (ignore the spike, near the middle, it just a data glitch). The humidity rises quite rapidly, as a hot bath is drawn, but that humidity, gradually reduces over the next 30 minutes, as the moisture is drawn out by the bathroom extract fan. The result - no mould at all. The decline in the blue line, on the right, is the result of the sunshine, this morning.

 

[mattylad]

We are well sealed up, never open windows in winter, yet we have no mould anywhere. How do you account for that? All we do, is ensure no excess moisture is generated in the home, and what there is - ensure it is extracted it at source.

If you cannot see how you are different Harry then I do hope that you have a jolly new year celebration..

 

[Harry Bloomfield]

If you cannot see how you are different Harry then I do hope that you have a jolly new year celebration..

Well, you explain the difference? and a Happy New Year to you!

 

[aveatry]

I cannot believe that to be correct, here is my log, for the past couple of days.... We never open windows in winter.

The green line is the indoor humidity, the brief rises, are the result of taking baths, the sensor is across the landing, from the bathroom (ignore the spike, near the middle, it just a data glitch). The humidity rises quite rapidly, as a hot bath is drawn, but that humidity, gradually reduces over the next 30 minutes, as the moisture is drawn out by the bathroom extract fan. The result - no mould at all. The decline in the blue line, on the right, is the result of the sunshine, this morning.

View attachment 403331

Maybe the dip after the bath rise is the humidity spreading throughout the house as it wafts past the sensor opposite the bath room

 

[Harry Bloomfield]

Maybe the dip after the bath rise is the humidity spreading throughout the house as it wafts past the sensor opposite the bath room

It quickly returns, to pre-bath level - if it simply dissipated throughout, then it would last longer/remain higher. It normally shows a similar peak, when we cook at home.

 

[accelerator]

To the OP. Have you checked that the ceiling isn't getting damp from water ingress? e.g. your roof is leaking.