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Mould caused by double glazing??

30 replies

TiredMum30 · 26/04/2024 14:19

Hi, posting here for traffic.

We have mould in our rented property, had the landlord out before and brickwork needed repointing, a guy came out and did the bare minimum, even I could have done a better and more thorough job then he did, so there's no surprise that the mould still keeps growing.
it's in 3 rooms, the walls and furniture it's growing on are along outside walls. The humidity in the house is ridiculous, so we always have to keep windows open during baths/showers/cooking, and i generally keep them open a little during the day anyway to try and reduce the mould growth.
Anyway the landlord sent another guy around today, this guy said its because this house wasn't built for double glazing! Erm is this correct? Is that what's causing the issue?
There's a tiny plastic vent above the oven in the kitchen and no vent at all in the bathroom upstairs, I feel like these may also be adding to the issue, aswel as the gaps in-between the brickwork outside 🙈
Just checking because I'm going to email the landlord again, because both me and my son have had persistent chest infections earlier this which took multiple courses of antibiotics to clear, so I don't want to get to next winter without the mould being sorted properly.

OP posts:
gizmo · 26/04/2024 16:22

OP, it sounds as if you are doing the right thing in keeping the windows open when showering / cooking and in having them open a bit during the day. Please do keep on doing that.

If that isn't shifting the problem there is every chance that the house needs some attention, not your behaviour. Things that might be needed:

Trickle vents (which are more common in double glazed windows than old single glazed, despite what your builder is saying!), actual working extractor fans in kitchen and bathrooms, better undercuts in doors to allow air to circulate throughout house. It could certainly be a problem with pointing and damp penetration into the home. The fact that it is along all the outside walls also suggests you have insufficient insulation.

Are you able to run the heating much at all? This would do two things:

  1. warm up the fabric of the outside walls reducing the condensation on them,
  2. hold more water vapour in the air, which means that if you ventilate effectively then you will get more humidity out of the home.
fieldsofbutterflies · 26/04/2024 16:13

Kitchens and bathrooms should really have extractor fans to help manage the humidity. If the property doesn't have them as standard, could you try running a dehumidifier?

EDIT: but having windows open during baths, showers and cooking is fairly standard.

Pheasantsmate · 26/04/2024 16:12

Your landlord is never going to be able to prevent mould for you if you don’t open windows after showering.

Haydenn · 26/04/2024 16:11

I would always expect to open the window or use an extractor fan when using the bathroom. The fact you think this is unusual suggests to me you aren’t really managing the property the right way to avoid mould.

Skippydoodle · 26/04/2024 16:06

Ventilation is key. There should be external extractors in both bathroom & kitchen, but even with this, windows need to be opened after showering/cooking. I am a landlord with a property owned for over 20 years. About 10 years ago I had tenants that were new and very quickly were overrun with mould, never happened before & has never happened since they moved on. So it is often very much a lifestyle thing. Lots of cooking, drying washing indoors & lack of opening windows at peak steam times will result in mould.