You can clearly see the damp patches in the chimney and on the side (party) wall where the floor is solid rather than suspended. Inside the chimney is bonded and skimmed and the side wall is just skimmed. I didn't notice the problem before although it was picked up as damp in a survey three years ago. It was originally dry lined within the chimney and papered elsewhere.
In the back of the chimney you can clearly see the brick pattern, and it looks like it is the mortar causing the problem. The damp so far is only a few bricks high.
I have dug out the back of the fireplace as it was cracked, and the soil underneath was very damp. I haven't done the same along the side as I was hoping to keep the original tiles.
I don't have a clue what to do so any advice would be appreciated! Thoughts so far have included injecting the wall, re-pointing the wall under the plaster, sealing the wall.
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