Hi,
Last year I noticed a slight change in colour on the paint of an interior wall, the pattern suggesting it was coming from where it joins the exterior wall. I had assumed that it was just a shadow for a while, but on closer examination the paint felt colder and slightly damp.
Looking outside, I found a drill hole in the brickwork at roughly the corresponding point. So I mixed up some mortar, filled the hole and hoped for the best. In time, the paint seemed to dry out, feeling as dry to the touch as the unaffected areas, so I hoped it was 'job done'.
However, as we approach winter this year, the problem has returned:
So I assume either the hole wasn't the cause of the problem, that I didn't do a good job of filling the hole, the mortar wasn't mixed correctly or you can't just fix it like that.
Here's the outside
and a zoom-in on the hole area
Thoughts?
Other info:
Exterior wall is north-facing, so never gets any sun.
House is a ~1900 terrace, so I assume the wall is solid.
Thanks,
Chris
Last year I noticed a slight change in colour on the paint of an interior wall, the pattern suggesting it was coming from where it joins the exterior wall. I had assumed that it was just a shadow for a while, but on closer examination the paint felt colder and slightly damp.
Looking outside, I found a drill hole in the brickwork at roughly the corresponding point. So I mixed up some mortar, filled the hole and hoped for the best. In time, the paint seemed to dry out, feeling as dry to the touch as the unaffected areas, so I hoped it was 'job done'.
However, as we approach winter this year, the problem has returned:
So I assume either the hole wasn't the cause of the problem, that I didn't do a good job of filling the hole, the mortar wasn't mixed correctly or you can't just fix it like that.
Here's the outside
and a zoom-in on the hole area
Thoughts?
Other info:
Exterior wall is north-facing, so never gets any sun.
House is a ~1900 terrace, so I assume the wall is solid.
Thanks,
Chris