Mould in 3 rooms upstairs

bhob

Hi all, so in my house currently the bathroom, back bedroom and front bedroom all upstairs have mould on the ceilings. There is another front bedroom but there is no mould in that room. Now none of the rooms have any sort of build in ventilation systems. We try and open the windows as mush as possible but to no avail.
A few weeks ago we cleaned all the mould off and repainted the ceilings with anti mould paint. Within a month it was back.
So I'm wondering what would be a good solution to this? Get a proper air ventilation system installed? Would this not cause the house to become considerably colder? How about a dehumidifier or even trickle vents? Also would trickle vents work on wooden windows?
Any advice is much appreciated in advance.

Lumen

Ventilation and insulation work together to create a healthy and comfortable environment.

Also need to check for structural sources of damp i.e. not generated by people, plumbing and laundry.

Metric Tensor

Yeah as Lumen says - the three ways to stop mould are:

1. More ventilation
2. Less moisture
3. Both of the above!


With the above in mind:
1. You should definitely install extract fans in the bathrooms immediately - particularly ones where you have showers.
2. You should have vents in the habitable rooms but if you have the windows open every day it should be doing the same job.
3. Don't dry clothes inside the house.
4. Open the bathroom windows when you are having a shower and turn on the extract fan.
5. Use the extract fan over your cooker when cooking.
6. Separately moisture/condensation will form on cold surfaces so there is a possibility there are some poor insulation/construction details at the points where the mould is occurring. Check the insulation quality and details above/behind if possible.

A month seems VERY fast for mould to grow on anti-mould paint! Vents should not make the house any colder than opening windows does!

DOCARCH

bhob wrote: »

Get a proper air ventilation system installed?

Google 'positive input ventilation'.

Metric Tensor wrote: »

A month seems VERY fast for mould to grow on anti-mould paint!

If all traces of the mould is not removed (which is very hard to do), it will reappear very quickly. I have seen it suggested before, that to completely remove the mould, you need to remove the plasterboard!

MicktheMan

DOCARCH wrote: »

Google 'positive input ventilation'.

or Mechanical Extract Ventilation; imo, far better than PIV:)

noodler

HG mould spray.

Works wonders.

I am assuming your anti mould paint isn't addressing the issue completely (but obviously you may have a reoccurring problem).

Most hardware stores stock it, one on Baggott Street and Capel Street in personal experience.

MicktheMan

DOCARCH wrote: »

I have seen it suggested before, that to completely remove the mould, you need to remove the plasterboard!

I've seen that suggestion too. Mould spores are everywhere regardless. It is not the presence of mould on the plasterboard that determines the extent of future issues but rather the presence of moisture allowing mould to thrive. Mould spores are everywhere regardless.