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Wet Windows

Joined
29 Feb 2024
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England
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United Kingdom
I'm finding a lot of condensation around the bedroom window as the nights get colder - we had new windows fitted with trickle vents and they're clear so i asked if the older windows could be fitted with them and was told not. Is there a way of reducing the amount of water around the window every morning rather than leaving a cloth to sop up the excess water?
 
See what i mean?

IMGP5607.JPG
 
The same happens to my bedroom but only when I do not have a window open.
With me it only happens in the autumn when we have big differences between day and nighttime temperatures..
Our breath contains moisture, I think that's where it comes from.
 
Probably just breathing and insufficient ventilation. Open the bedroom window in the morning after throwjng back the bedclothes so they can air.

You could open the door a crack or open the window the smallest amount overnight. But check other rooms early in the morning.

If there is a source of damp in the house such as a bathroom without good extraction, or wet washing draped around, fix it. Less often there is a tiny leak from a radiator or water pipe.

Water vapour is lighter than air so will rise within the house.
 
Trickle vents don't stop condensation. Simply not enough fresh dry ( cold in winter) air coming through property.
Run a dehumidifier for 4 ish hours every night is one answer. Worked for us.
We run two and starred the session last night as we started noticing condensation on glass.
We dry washing with dehumidifier in the winter and use bathroom and kitchen extractors.

Its complicated to understand what's happening but help is available. People think opening windows or turning up the heat is the answer. It's not.





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Trickle vents don't stop condensation. Simply not enough fresh dry ( cold in winter) air coming through property.

That rather depends how much water vapour is being added to the inside of the house, and how much is being ventilated out.

I find a bit of ventilation works fine.
 
So that's the answer. Trickle vents fitted and no more condensation. Instant cure of all mould and condensation?
Those that like that idea can have vents filled if you don't have them. I fitted some to bring my old uPVC windows to building regs when I extended kitchen.
I don't think it's that simple
 
I find a bit of ventilation works fine
It's not as simple as that although it can be.
Depends.
Interesting subject though and we will see regular questions raised here as the temperature drops and heating goes on.
I've seen modern houses with wet slime on the walls and others covered in mould.
It's a real problem for some
 
the simple answer is
more ventilation than moisture build up then no condensation
less ventilation than moisture build up then condensation

in general do not dry clothes indoors or shower or bath without bathroom extraction greater than moisture generated along with kitchen extraction greater than moisture generated and with trickle vents normal breathing and household activities will not be a problem unless damp from other sources like leaks or rising damp exceed the amount than can be removed by passive ventilation
 
Usually straightforward to retro fit uvpc vents. No guarantees it will prevent condensation but should reduce it.



That's an excellent idea, although the example shown is fitted on the ground before installing the window. Ours are already in situ and 30' off the ground. I'll have to get my son to do it.
 
Trickle vents don't stop condensation. Simply not enough fresh dry ( cold in winter) air coming through property.
Run a dehumidifier for 4 ish hours every night is one answer. Worked for us.
We run two and starred the session last night as we started noticing condensation on glass.
We dry washing with dehumidifier in the winter and use bathroom and kitchen extractors.

Its complicated to understand what's happening but help is available. People think opening windows or turning up the heat is the answer. It's not.





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I do that a couple of times a week around the house and find it takes out a litre in around 8 hours. Is that normal?
 

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