Damp basement from inside or outside?

No, I mean the ones on the walls. Everywhere the paint is peeling off.

Ok, but isn't it strange that the peeled paint is only found on the chimney? Could

No, I mean the ones on the walls. Everywhere the paint is peeling off.

Yes, but it only peels off near the chimney shaft. Could it be that the moisture is coming from the chimney shaft and will improve now that the roof has been renovated? What surprises me is that the paint is also peeling where there is no soil on the outside - meaning, it is not buried that high. And from outside everything looks fine. In addition, there is only the grate and no window in that room. Could that not be related to moist air being drawn in from outside?

Doesn't look too serious to me, but only an expert can say that with certainty.

Doesn't look too serious to me, but only an expert can say for sure.

Thank you. Where can I find someone reliable and what might that cost?

Somehow I am still missing part of the information: The chimney shaft is damp because of a leaking roof. What about the shaft itself? Is it open at the top? Is the draft still being fired or used? Where does the half centimeter of water come from – did it all run through the shaft into the basement? What exactly did the leaking spot in the roof look like?

I would – if no heating is attached – in any case first permanently open the inspection hatch anyway, as well as the windows in the basement, to ventilate the draft.

Somehow I am still missing part of the information: The chimney shaft is damp due to a leaking roof. What about the shaft itself? Is it open at the top? Is the draft still fired or used? Where does the half centimeter of water come from – has it all run through the shaft into the basement? What exactly did the leaking spot on the roof look like?

I would – if no heating is connected – in any case first of all keep the inspection hatch open permanently, as well as the windows in the basement, to ventilate the draft.

So: We bought the house in 2014, the heating system (oil) is from 2006.

The stainless steel pipe goes from the heating system through the shaft up to the roof.

In recent years, there was occasionally some water on the floor.

Last year in spring, the wallpaper in the bedroom in the area of the shaft was damp. We then opened the wall at one spot – damp insulation was inside. We removed this in the area of the hole.

The hole was closed again before winter.

In February the roof was renovated – the roofer found that there was water under the chimney cover. The cover was sealed.

After that, I placed a bucket in the basement – since then the floor has been dry. There is minimal water – since February about 1/3 of one, if at all.

This morning I measured the wall moisture again in the living rooms through which the shaft runs – 12-16 percent… so there is still moisture there.

My idea was that the water now trapped in the masonry is slowly drying?!

And then I measured the plaster flaking on the exterior wall. These are, as can be seen in the pictures, strongest in the direction of the chimney shaft. Here the moisture is 12-18 percent. Behind the bucket, on the shaft itself, in some places up to 30 percent.
There is no window in the heating room, only a grille. Maybe. Is that also a problem?

My question is: Does the moisture on the exterior wall come from the damp shaft, or can it come from outside and I have a generally damp basement wall?

The remaining basement rooms have a wall moisture of under 10 percent and an air humidity of 60 percent – I haven’t ventilated for ages (I know that’s my fault).

Should I have an expert come to measure it or is that not necessary?

I would just wait for the summer. If you still have moisture in the fall, you can have someone come. It is certain that water came into the chimney through the leaky cover, the areas that are damp mostly have no contact with the exterior wall.