Is this amount of condensation right for new sash windows?

Notch7 said:
at a guess the glass temperature is likely to be at least 10 degrees cooler than ambient room temperature

its concentrated near the meeting rail which is a bit of a thermal bridge


with shutters, the window reveal is still open to vapour from the room but the shutter is closing off the rooms heat to the reveal and so the air cools down in the space.....
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That makes sense, as most other shutters are open (no one is sleeping there) and hence much less condensation.
 
When did you have it replaced?

If after Jun 15th 2022 you should have had trickle vents fitted as building regulations require it now... UNLESS you have another ventilation ssytem or airbricks or are in a Conservation area.
 
ronniecabers said:
When did you have it replaced?

If after Jun 15th 2022 you should have had trickle vents fitted as building regulations require it now... UNLESS you have another ventilation ssytem or airbricks or are in a Conservation area.
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:eek: I just had the fitted last week!
I don't have any other ventilation system or airbrick, nor am I in a conservation area... I've got many quotes (10 or so) and none of the joiners mentioned that.
 
Have any of them signed it off with building control, or certification such as Fensa or Certass?
 
Who's signed this one off basically! Lets hope Fensa or Certass don't do a spot check, I used to when I worked for Certass.

OP mentioned bedroom and ensuite were the worst, just wondering if theres an extractor in the ensuite on a timer preferably on for 20min after a shower, then bedroom and its amazing how much water 2 people breathe out overnight, that humidity has to go somewhere and it looks like it prefers the cold surface of the glass, I'd hazard a guess and say its not a Low E glass with a warm edge spacer
 
Hard to tell the spacer bar , maybe white warm edge ( even though that's not been widely available for a while) but can't tell from the pics. Low e or Argon... who knows .
 
ronniecabers said:
Have any of them signed it off with building control, or certification such as Fensa or Certass?
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No, not yet, just finished the installation last week. But I was told that Fensa can just sign it off without a visit, or they might visit to inspect.
 
crank39 said:
Who's signed this one off basically! Lets hope Fensa or Certass don't do a spot check, I used to when I worked for Certass.

OP mentioned bedroom and ensuite were the worst, just wondering if theres an extractor in the ensuite on a timer preferably on for 20min after a shower, then bedroom and its amazing how much water 2 people breathe out overnight, that humidity has to go somewhere and it looks like it prefers the cold surface of the glass, I'd hazard a guess and say its not a Low E glass with a warm edge spacer
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I have the extractor switched off since it's quite noisy in my bedroom. Whilst on the subject, can anyone recommend an effective and quiet extractor or ceiling dehumidifier?

From what I gather, humidity gets trapped between the window and the blind and just condenses where cold air comes in, that is the gap between the sashes. A little draught does exist there (if you put a lighter you'd see the flame moving slightly for example).
 
NorthernLights811 said:
I have the extractor switched off since it's quite noisy in my bedroom. Whilst on the subject, can anyone recommend an effective and quiet extractor or ceiling dehumidifier?
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Yes. Please post a photo of the one you have, and the outside vent. Can you see a makers name or model?

Does it go straight through a hole in the wall? Or is there a duct, for example in the loft?

Is it a 4-inch (100mm) diameter fan?

Does it turn on with the light switch, and does it have a timed over-run?
 
JohnD said:
Yes. Please post a photo of the one you have, and the outside vent. Can you see a makers name or model?

Does it go straight through a hole in the wall? Or is there a duct, for example in the loft?

Is it a 4-inch (100mm) diameter fan?

Does it turn on with the light switch, and does it have a timed over-run?
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I have this. It's with a timer switch and a timer as well, through the wall to the outside.
 

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NorthernLights811 said:
I have this. It's with a timer switch and a timer as well, through the wall to the outside.
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Well that's interesting. The Envirovent Silent 100 is one of the best, though yours looks rather old.

The current one has a ball-bearing motor mounted on resilient rubber. I find them very quiet. Inaudible with the door shut and drowned out by the noise of e.g. a cistern refilling or outdoor noise if the window is open.

I suppose yours might be worn out, or possibly the fan is rubbing on the case, or the case might be vibrating

Push the case with your finger to see if it is vibrating.

If you take the front plate off (clean out the dust) you will see if the rotating fan is rubbing. This can happen if it is distorted by tightening tbe screws on a wall that is not flat.

Does it seem like it might be a worn out bearing?
 
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