Wet patch in lounge

[immortalmarble]

Bit of a strange one - have an apartment which is a big house made into flats. Ours is second floor of three. It is presently unoccupied.

There is wooden floor throughout and I keep noticing a wet patch in the lounge. There isn’t a leek from the apartment above and it’s nowhere near water but the water is turned off in any case.

Obviously a plumber is needed but I wondered if anyone had any ideas as to what it might be as it’s really confusing me!

Are you certain there isn't a leak from the flat above? It might not be a constant one. Perhaps a leak from something which doesn't constantly have water going through it, like a faulty bath or shower seal or a leak at the back of a washing machine or a leak from something used infrequently; a leak which isn't having an impact on the flat above. Is there a mark on the ceiling of your flat?

No, that’s why I thought there probably wasn’t a leek above me but it’s possible, I suppose. The plumbing in this flat seems to have been a bit peculiar for a while though, which is why I turned the water off. Thank you for answering! I’m just a bit flummoxed.

what is under this floor? Is it floorboards over a cavity? Or is it laminate or engineered fixed to a concrete or chipboard subfloor?

Wet patches on floors are often due to radiator leaks. Unless the floor is perfectly flat, it will run to the lowest point.

With an overlaid floor, the water might be in the subfloor and leaking upwards through a small gap. This will have caused considerable damage to the floor.

Could it be heavy rain coming in at the window and puddling along the floorboard? This happens at my mum's house

Thank you pigletjohn! The radiator must be the culprit then - how odd. I do not know what a cavity is though!

It’s not near the window - it’s a big bay window and seems fine. Thank you