Window condensation and mould help!

tacpot12

The bathroom fan needs to be connected to a humdistat so that it runs all the time that the bathroom isn't dry. This might take a few hours if the fan is not powerful, hasn't been positioned in the best location, or if the ambient RH is high. 

One of those Karcher Window Vacuums would be a good way to collect the condensation on the windows. Other than that its ventilation or a dehumidifier to get moist air out of the home.

PIVs work well in older properties, but they need to pre-heat the incoming air in winter if they are not to make the house feel cold. This adds a bit to the running cost as the electric pre-heating costs a bit more than central heating, but you only need to take the chill off the air. 

tacpot12

Chloe_G said:

Can you install a PIV in a house without a loft? ie. with a completely flat roof - 1930s art deco style.

Yes, I've looked at them for a flat I own. The intake and exhausts enter the property through a side wall, and they are small enough to sit inside a cupboard. They would usually be fixed to the ceiling, but can be mounted on a high shelf in cupboards to hide them away. They need anti-vibration mountings wherever they are installed, just to avoid any resonance of the very quiet fan noise.  

jonnydeppiwish!

mrsmsebastian said:

We recently got the glass unit replaced due to condensation inside the glass and fitted a window vent hoping to resolve the mould forming on the sill. Unfortunately still exist as shown in the pic.
Can you please tell me what else can I do to prevent this from happening. Shall I replace the whole window?
Thanks

What room is it?

if it is a kitchen then it needs to be left open longer. Lids on cooking pans (saves energy use as well), extractor on.

If it is a bedroom, then you need to open it every day to clear. Remember the average person breathes out a litre of water every night!

grumbler

Ben1989 said:

There's the same amount of moisture in the air so heating up won't help as as soon as it hits it it'll cool and condense (hence why it's called relative humidity).

Not true. With the same amount of moisture relative humidity drops when temperature rises. And windows get warmer too.

mrsmsebastian

Ben1989 said:

There's the same amount of moisture in the air so heating up won't help as as soon as it hits it it'll cool and condense (hence why it's called relative humidity).

May I suggest a PIV. Since installing I get zero condensation on all my windows, not a single drop.

What is PIV

shiraz99

mrsmsebastian said:

Ben1989 said:

There's the same amount of moisture in the air so heating up won't help as as soon as it hits it it'll cool and condense (hence why it's called relative humidity).

May I suggest a PIV. Since installing I get zero condensation on all my windows, not a single drop.

What is PIV

https://www.nuaire.co.uk/residential/positive-input-ventilation

mrsmsebastian

Is that the kitchen? It looks like it's facing north so it's the coldest room/part of the house. If so I would open the window whilst cooking and leave open till 10 minutes after cooking on the hob. If you have a gas hob I'd open the window as soon as you have the gas on as gas once burning expels moisture. If you have another window or door in that room whilst cooking, if you see it starting to condense heavy open the above to have 2 points of airflow, much of the moisture will shoot out.

I used to have a similar issue till I realised the hood did very little, now I always have the window open whilst using the hob. I also have 3 old jam jars half filled with salt from October till march on the window sill to soak up any new moisture forming, I no longer have issues with images like you currently have.

You could also get in the habit of squeegeeing the window if you see it starting to get heavy. You could also leave the window open/ajar during the day to get rid of the excess moisture, (if you do this turn you heating thermostat to off or very low to stop the boiler kicking in all the time whilst you're out.)

In my experience of living in cold and draughty house's, I doubt a new window will make any difference.

You are right it is north facing. 
My cooker is an extracting hood.
I left the radiator exactly as it is which comes on when the house drops below 19 but what I did is left the window ajar as shown in the pic constantly. The room feels drier but a little cold, but at least the heavy condensation has gone

Vegastare

I have noticed that I get some condensation on my lounge window after a very cold night.  We have newish ( 3 years) double glazing.  While no mould as wipe down etc - if I do not close the vertical blinds and keep curtains only partially drawn the build up is much less.  Wonder if you leave your blind or curtain drawn.

Just an idea

Bendy_House

MrsB, WHAT room is it? What's it used for?

mrsmsebastian

Bendy_House said:

MrsB, WHAT room is it? What's it used for?

It is a bedroom next to the kitchen.