Postby sloaney donkey » Sun Feb 24, 2019 10:04 am
You may want to start with a surveyor specialists in damp.
Have you got a leaking pipe ? Is your underfloor heating leaking, or do you have a leak from a bathroom upstairs?
When it rains, check the guttering. It is possible the guttering leaks and dumps water on the wall.
Is there a proper damp course or engineering block at low levels?
We have not had amazing amounts of rain this winter or in the past few weeks. It should not be getting damp unless something is wrong.
May be that the brick (Victorian Suffolk) is just too soft and too old.
Good luck !