Concrete floor damp proofing
Help! My old kitchen floor, which is now a dining room floor after an extension was added, has a damp patch about 1 foot sq. Investigations revealed that a hole was dug into the floor, piercing the damp proofing, to seal the old commomn water mains up (with the other semi), and was just filled in with concrete to floor level.
Can anyone advise me how I can fix this problem?