Plastering & Rendering

very slow progressive damp patch on ceiling below where chimney breast used to be downstairs

Anonymous user 20/02/2024 - 2.30 PM

we have lived in our house for around 8 years, an old mid terrace. We have had a new roof around 3 years ago. however we still have a damp patch that causes the downstairs ceiling plaster to flake and begin to crack (hairlines) the problem we have is diagnosis. It could be a leak from next doors upstairs radiator but they would need to remove floor boards ect. the downstairs has had the breast removed prior to us moving in many years ago. we cant confirm the lintel but if its wood maybe damp wood pressing onto the plaster board? we have had next doors landlady get someone in to check and pack the chimney stacks and check for issues around the roof and breast her side. still we are non the wiser. getting to the point would it be possible as its so slow to have some sort of new waterproof plaster board fixed across the ceiling and plastered and painted for at least security now? my worry is how hard to diagnose this and we could rip up all rooms floor boards but still have no luck? alternatively we make a whole in the ceiling where the issue is for inspection? appreciate any help its being a right pain and cant afford to cover all angle so trying to eliminate as much as possible.