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I'm trying to control humidity and damp in my cellar and unsure whether to get a normal humidity controlled extractor fan to extractor moist air outside or get a heat recovery exchange fan to both extract moist air and bring in fresh air?

I have one part of an original wall behind plasterboard in a converted cellar which is becoming wet due to condensation as you can see by the below picture, the wall had just been wiped so not currently wet. The rest of the wall is bone dry, probably because most of it is not tanked, but I am...

I have one part of an original wall behind plasterboard which is becoming wet due to condensation as you can see by the below picture. The rest of the wall is bone dry, probably because most of it is not tanked, but I am unable to ventilate the area sufficiently due to the layout to help stop...

The rest of the wall is bone dry, probably because most of it is not tanked, but I am unable to ventilate the area sufficiently due to the layout to help stop this condensation. As the area in question is only small, just bigger than the cut out piece, would spraying insulation foam directly...

Agreed but how do I ventilate an insulated cavity wall? I can't put air bricks in as the entire cellar is under the ground apart from 1 very small window. I could put an air vent at the bottom and top of the plasterboard where the wall is wet but it would only vent into the main room and not...

I have a converted cellar, was done in 2020 well before we bought the house but a bit of a DIY job so hasn't had the full waterproof treatment etc. Unfortunately when we moved in July 2022 we had our washing machine leak in the cellar which required me to cut a small hole in the drywall, as seen...

Absolutely none, tends to sit around 15/16 degrees in the summer and 12 in winter so not massively cold. I don't use the room that much so I don't really want to be heating it 24/7 to keep it a good temperature. Would getting a humidity controlled fan in there help the situation?

Than you all. I may price up a humidity controlled extractor fan but due to the layout of the cellar there isn't a great deal of places I can put it if any. The cellar was converted before we moved in but it is a DIY job so not waterproofed properly. However, in most cases the cellar is bone...

Great, thank you. I was thinking about a humidity controlled extractor fan so will look into it. Window already has a trickle vent and dehumidifier runs a fair few hours but humidity always stays high. Got a look of books down here and still staying strong after 15 months so hopefully something...

Also, would a vapour barrier on the warm side of the insulation cause more condensation trapping moisture between the vapour barrier and tanking?

How so? I'm not very good with this sort of thing. The room has no heating and sits around 14 degrees all year round. Only 4m2 converted office space.

How would I check if the tanking has failed? It is almost all of the tanking in the room so surely not all of it would have failed? The other brick is untreated and bone dry so would it not also be seeping through the normal bricks if it was penetrating damp? Also, no condensation at all on...

It's been poorly converted I think so even with a dehumidifier, windows open etc the humidity aways stays high regardless so without spending £30k on having the whole thing ripped out and done properly I think it's just something I am going to have to live with

So only some of the wall is ranked and this is the only part getting condensation. The normal wall right next to it is dry so hence presume condensation as no other water entry apart from the tanking. It has happened to other parts of the tanked walls but these were exposed so easy to control...

Unfortunately little as it's down in a converted cellar. I have an air vent at the bottom of that particular cavity wall but still isn't solving the issue. I have trickle vents in the window down there and dehumidifiers running but condensation is still forming behind the insulation against the...

I have got a tanked wall behind plasterboard with insulation in the cavity. However, it seems like I have condensation on the tanked wall and some of the insulation is getting wet so am I better to push the insulation against the tanked wall in the hope it will stop the condensation or best...