Not sure if anyone will know the answer to this one!
We have got a wet patch on our carpeted floor about 6inches by 8inches wide. The carpet is soggy to touch. But, it is only wet in this one area, and the carpet goes from being really wet to really dry.
It is in a position where it is very close to the external wall if our extension was not built, and is by the door going into the extension iyswim.
It has seemed to appear from nowhere.
What can it be? Is it likely to be a bust pipe, or something more serious?
I do think the damp proof course is the cause. My theory is that when ground becomes sodden, wherever the breach is sucks up the moisture - I thought the floor would be solid. You should call a builder.