Damp Proofing

Damp patches on my chipboard floor and I cannot get chipboard flooring dry

Anonymous user 15/03/2024 - 2.44 PM

We had some damp work undertaken in July 2018 where the walls were injected and a membrane (looks like a plastic sheet attached to the wall) put up, then the walls replastered. It was very costly. The damp people put the kitchen back and gradually we've been noticing a very musty smell from some of our kitchen cupboards under the worktop (in the area where damp was treated). I removed the kitchen skirting and looked under the unit and it looked like the chipboard floor was wet in places. I removed the kitchen units and tried to dry the area with a hairdryer and left a dehumidifier in the area for 2 days. I left the kitchen units out for 4 days and cleaned the mold off the walls from behind the units which started to form. The hairdryer makes the wet patches disappear but then after a few hours they return. I've probably dried the area with a hairdryer about 15 times to the point each time that the floor looks and feels dry. There doesn't seem to be a leak anywhere, is it a case that this chipboard floor just won't dry or is there something more sinister? Could there be moisture under the chipboard? Is it possible for damp behind the membrane to drop down and form a puddle?