HI everybody, can you help me please, it's a real mystery what's going on with our 'damp' problem that thus far, it's left 6 tradesmen and a building engineer with ice packs on their heads.
It started off with there being no DPM installed when the fireplaces and hearths were replaced by the previous owners. The concrete bed on one was crumbling which led to further investigation to discover both beds were wet through and damp was being drawn to the breast, walls and in one, the floorboards. We've dug them out, hacked off the plaster and let it dry naturally.
However, on one the floorboards won't dry. We've removed all nails and put a DPM along the joist and it's continually wet, I've been underneath to see if the boards are in contact with anything that would allow moisture to travel - nothing is in direct contact - they've been left for 5 weeks, boards to the side have been removed to help airflow, the damp doesn't travel, it's static.
Applying heat, they change colour as if to be drying, only for when the heat is turned off, an hour later they're sodden again - but there is no water source, nothing acting as a wick and to cap it all, it's only the boards in front of the hearth that was. Nobody thus far can explain it, we've checked airflows, they're OK, we are well and truly confused and running out of ideas. I know I could chop them and put moisture board in (which will eventually happen) but before we do, I'd like a solution and cure, not a short term fix. I've attached a few photos of the job and any sensible help and advice is more than welcome.