Causes of condensation

[Jacko789]

What are the possible causes of condensation?

Situation: - Condensation is making an appearance on the walls in one corner of one of my bedrooms. Both sides of the corner are to external walls, not internal walls. I have re-pointed the external brickwork but condensation is still forming. The walls in the corner are cold to the touch (the same wall is noticably warmer 2 feet away).

[Westminster]

The easiest way to reduce the condensation would be to incease the ventilation. Sleep with the window open.

[peanut]

sounds like a lack of insulation keeping the cold out and the warm in.

[rojash]

If one part of the wall is colder than the rest, then the chances are that there is rubble wedged in the cavity between the outer and inner walls,. This will conduct heat across the cavity. Condensation will form on the cold surface that is produced.

[Bonzo 2000]

Repointing the outside masonry will not reduce condensation, unless the dampness you are noticing is actually penetrating dampness and not condensation.  If it is condensation, Westminster is right - increase the heating and reduce the humidity, ideally by keeping the room better ventilated.  It seems odd that the wall is noticeably warmer nearby - if it is an insulated construction, the insulation may be missing from the wall at this point, making the coldest part of the room and therefore the most likely place for condensation to form.