OK so now I am well passed the end of the old teather! Bought house in 2002 and discovered that damp patch in dining room was not due to patio door problems but a leaking pipe in the solid concrete floor. So broke out top of channel and repaired leak in hot water feed for the existing kitchen extension. The damage was a broken elbow that had obviously been leaking a fair while due to limescale build up on the face of the fitting. The elbow was replaced with a formed bend for better flexibility. The floor was left uncovered for a good while and the top of the slab appeared completely dry. Last year we decorated the room and finally got carpet down. Over the weekend I noticed a raised bit of floor toward one corner, peeled back the carpet to find that some infill concrete has "blown" due to damp and there is a film of water on the bottom of the underlay.
So the questions are:
Has anyone had serious leaks into a concrete floor? Could the appearance of water be a result of the CH driving previously leaked water to the surface? How can I find the source of another leak if there is one? I cannot hear water running when all taps etc are off. The CH header tank does not appear to drop significantly if the ball is tied up. Within the dining room floor there are CH flow/return pipes, hot (gravity fed) and cold (mains fed) water to the kitchen.
Any suggestions on means of locating/testing for leaks would be appreciated. The fact that the room is the most recently refurbished makes me reluctant to start hacking up floors/destroying box work etc. SWMBO has not yet been appraised of the issue!
Should insurance cover this? No plumbing work has been carried out in the last 2 years!