Penetrating Damp or Condensation?

Matty0682

ThisIsWeird said:

Are you detached, Matty?
What's on the other side of that wall? 

End of terrace. That wall is the outside wall

ThisIsWeird

Matty0682 said:

ThisIsWeird said:

Are you detached, Matty?
What's on the other side of that wall? 

End of terrace. That wall is the outside wall

Could we have an outside pic, please?

jonnydeppiwish!

As pp poster has said, they’re is a clothes dryer in the room. Are you ventilating the appropriately? 

Try using a dehumidifier in the room for a prolonged period - 2-3 months.

Second, get a reputable trade to look at the chimney - is the lead flashing still in place and serviceable, does the pointing need redoing.

Third, is there a gully/guttering that is blocked and allowing water to pool?

Could you poke your head out of the skylight and have a look 👀 

ThisIsWeird

jonnydeppiwish! said:

As pp poster has said, they’re is a clothes dryer in the room. Are you ventilating the appropriately? 

Try using a dehumidifier in the room for a prolonged period - 2-3 months.
Second, get a reputable trade to look at the chimney - is the lead flashing still in place and serviceable, does the pointing need redoing.
Third, is there a gully/guttering that is blocked and allowing water to pool?
Could you poke your head out of the skylight and have a look 👀 

Totally agree that the outside - flashings, gullies, ext wall - should be investigated. 
Since it isn't D&D p'board, I can't see the very defined patchy pattern making sense being caused by condensation.
It just looks like penetrating. Water presumably getting into the wall fabric from above, and making its way down, finding random points where it can seep through; some patches look stained.
Even cracked or loose render can cause this, with rain being trapped between the failed layer and the brick.

Okey00001

With laundry and windows shut, it is condensation without doubt!  Especially towels, sheets and when laundry is treated with fabric conditioners, it takes longer to dry and humidity is in the air for long hours.

If the kitchen is next to this room, or even the bathroom, steam will reach the coldest area of the house. 

We had similar and left it too long, that the bricks within the wall was damp along with cracked rendering outside. Cracked rendering on external wall lets in a lot of water over the years and causes damp bricks. It will take a while to dry.

Now that we have addressed the problem - laundry in closed room with window open. Hired a dehumidifier for 2 weeks. Improved ventilation in cupboard doors, as well as house.  Replaced old guttering.  The house is aired, kept warm but not stifling hot like a greenhouse. 

Grotdog

Dot and dab. Cold spots connecting with the wall. Very typical...  Thermal imaging would show that very well..
Solution - better management of moisture in the building - better humidity controlled extraction... and constant gentle heating..