I would love any thoughts. For the last 6 months I have had some blackening along the groove of one oak floorboard. There are no pipes in the immediate vicinity. Nearest is a mains inlet about 3 ft away and a soil pipe that runs under the floor about 3 ft away. The oak is on concrete which had a sealant put over the concrete about 10 years ago. The floor reads damp underneath. I got a leak detection company in but they could suggest nothing except excavation. I have placed kitchen roll on the floor every 24 hrs and spots of damp come up along the groove. Same spots every night. About the size of a 10pence piece. There is no smell and nothing else. Anyone any views at all as I don’t know where to go with this. Thank you all.
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Since you mentioned a pence, I assume this is in England. Find out if the building is constructed with a vapor barrier under the slab. If it is, there can be a minor leak in piping and it traps the water between the vapor barrier and the concrete, The concrete acts like a sponge and water can weep long distances.
This happened a number of times in the condos where I live. The cause was always a leaking pipe or a cracked drain. Toilet flanges are often the problem. However your type of plumbing may be different.
Bottom line is you need to track the path of the moisture to direct you to the source. This has been done with a moisture meter in most of the instances I have encountered. Use the meter to measure the moisture content and draw a map of the floor marking the readings. The higher numbers will guide you to the possible source.
RMDman
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