Fix the only way to properly inspect the issue and fix it is to locate the suspect wall tie the best method for this is to hire a metal detector so that you can accurately pin point it probably around the area where the damp patches are.
Paint for cold room walls.
The wrong white paint can look flat and cold.
You must choose the appropriate type of concrete paint determine if the wall is sealed from moisture and apply primer prior to painting the wall.
Carry the shade down to picture rail level to create a cohesive feel and pick a light but warmer tone such as this soft wool for walls.
Paint like other materials reacts to changes in temperatures even if you are painting inside your temperature controlled house.
The wall ties between two walls can become thermal bridges and cause the mortar in the walls to break creating cold spots on the walls.
However there are some things to consider when painting a concrete wall.
You need to be mindful of the effects of cold weather on different types of paint and take any steps to ensure the air and walls in the room you wish to paint are warm enough so they do not affect the paint adversely.
Painting a room offers an inexpensive way to refresh its appearance.
So swear off the white emulsion and pick up a bold shade for your living room colour like farrow ball citron instead.
The hottest living room paint trend for the year ahead is to paint your ceiling a colour.
Where all white can look one dimensional furniture in similar or muted tones will make you rooms feel lighter and larger and pops of color add contrasts.
It can create shadows and make rooms look smaller and lifeless.