Inner wall condensation

[chrisplowman]

I've converted a room that wasn't really used into a home office because 2020 and have started getting patches and drips on the walls.

This is the inside of a NW facing wall. The part of the wall that is sticking out is a, not used, chimney breast. There is a radiator under the window.

I'm assuming that is just standard condensation but could it be a symptom of something else?

If it is condensation is there an effective treatment other than external rendering, there is none currently?

 

[endecotp]

Do you have and use kitchen and bathroom extractor fans?
How do you dry clothes?

 

[foxhole]

Could be damp from unvented chimney, or poor stack condition .Is the chimney completely sealed ?

 

[chrisplowman]

Thanks for your replies!

Do you have and use kitchen and bathroom extractor fans?
How do you dry clothes?

Have kitchen and bathroom extractors. Bathroom is in an extension off the back of the house so not connected to this room. Clothes are dried in a condensing tumble dryer. The kitchen is directly below this room and we don't use the fan religiously as it is pretty noisy but we will normally open a window when cooking.

Could be damp from unvented chimney, or poor stack condition .Is the chimney completely sealed ?

We did check the outside of the chimney and there are some cracks in the joints around the top. Not sure if it is completely sealed or not. We have an air vent in another breast downstairs but there isn't one in this room.

 

[foxhole]

How is the room ventilated?

 

[chrisplowman]

How is the room ventilated?

There is a large window that has a small vent at the top, that is the only ventilation (other than the window that doesn't get opened in the winter). I have smart heating that says that the humidity peaks at about 65% just before the radiator comes on.

 

[foxhole]

Looks like you may have an uninsulated ceiling above the wet area?

 

[chrisplowman]

Looks like you may have an uninsulated ceiling above the wet area?

That is very possible! There is some insulation in the loft space but I don't think it goes all the way to the edges.

 

[chrisplowman]

Looks like you may have an uninsulated ceiling above the wet area?

Actually scratch that. It's just roof above, not loft space, but still may be uninsulated

 

[Harry Bloomfield]

I

There is a large window that has a small vent at the top, that is the only ventilation (other than the window that doesn't get opened in the winter). I have smart heating that says that the humidity peaks at about 65% just before the radiator comes on.

You need that probably below 50%. All chimney flues need ventilation, I would suggest that you add an 'hit and miss' grill to that chimney flue and ensure it is capped with a ventilated cap.

 

[endecotp]

Is there also condensation on the window?

 

[chrisplowman]

Is there also condensation on the window?

Nope