Condensation in the kitchen - cold water pipe from toilet

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Hi all,

Bit of a mixed one this and I think I know the route of the issue but wanted to see if I’m looking at this all correctly.

In the photo is our kitchen/diner wall. After cooking on Sunday (which was quite a lot of boiling) the wall showed an outline of the cold water pipe behind the plaster which leads to the toilet in the bathroom upstairs.

It’s the first time it’s done this and has done it for the last week when cooking. Therefore I think (bearing in mind the time of year) it’s purely condensation. Adding to this the walls were a light colour until I painted them a dark grey in the summer. So it might have done this before but not been noticeable.

Checking the toilet, it does get a lot of condensation on the cistern which then drips onto the floor a little. The connection of the pipe to the cistern did have a leak around two years ago which doesn’t seem to be present any more. This caused the patch to the top of the wall which only re-appears after cooking as can be seen in the photo of the kitchen wall, so it’s as though there’s still something in the plaster.

I will note in terms of an extractor when cooking, we have one which doesn’t extract to the outside and effectively just re-circulates.

So, I’d like to be corrected if I’m wrong with any of this:
1. There’s little I can do about the pipe condensation behind the plaster, maybe I should re-decorate to a lighter colour?
2. There must be a lack of good ventilation/extraction/air circulation in the kitchen for when we’re cooking currently.
3. To get rid of the condensation on the toilet cistern, I’d need to insulate the inside of the cistern? I’ve seen videos of people doing this with a yoga mat?

Any thoughts on my assessment of it (please don’t be too harsh) would be much appreciated.

P.s - please don’t judge me on the bathroom tiles - previous owner’s choice... not ours!

Many thanks!
 

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I will note in terms of an extractor when cooking, we have one which doesn’t extract to the outside and effectively just re-circulates.
Totally useless for any purpose.

There must be a lack of good ventilation/extraction/air circulation in the kitchen
And the bathroom.

The answer is proper ventilation - the kitchen extractor must extract outside, and the bathroom also needs an extractor.
Air must also have somewhere to enter both of those rooms, typically a gap under the door, assuming the rest of the house is not airtight.

Paint and yoga mats are not a solution.
 
As for the bathroom ventilation, this has an extractor which seems to work fine, it’s purely the cold water coming into the cistern into a warmer room surely that’s causing the condensation there?
 
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How close to the wall surface is the cold pipe, if you put your hand on the wall, can you feel the cold water pipe beneath? If so I'd suggest the cold water supply needs to be chased deeper into the wall
 
Last pic.....I'd suggest the connection to the fill valve is still leaking.
Heat the room up with a fan heater then check again with kitchen roll.
John :)
 

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