Damp floor boards

[Ashworth1]

After removing my lino floor in the kitchen I found part of the floor solid not floor boards like the rest of the house. Where the solid floor meets floor boards it was wet all along the boards (in the picture it only looks like like one part but that's because it dried out once the lino was lifted).

Any suggestions as what should be done. I was going to remove some of the concrete and put a membrane in ???

Thanks

 

[KenGMac]

From the image posted, the overall dimensions of the concrete appear [relatively] small?

The concrete may have been an old fireplace?? or an old wood rot outbreak??

if it were me I would remove the concrete, and any hardcore / soil below the concrete topping then install joists and a timber floor, with a vented area below the new joists and boards. What state are the external air bricks in, and are there any near this area of concrete??

It is heartening that the floor boards dried out so fast, notwithstanding if there was no leak or water spill to occasion the wet boards if recovered the boards will probably get damp / wet again??