our water system at home works perfectly when we are at home, but when we leave for more than a couple of days the bathroom starts leaking water that goes dripping right on the kitchen that is downstairs.
If we close the mains valve when we leave for few days the drip obviously doesn't occur.
Above the spot where we get the drip there's both the WC and the bathtub, both work fine when we are at home, but as soon as we don't use the water system for a few days, the leak comes back. (it's also quite a big leak, with many drops per minute)
The pipes have been assembled by the previous owner of the house, and he wasn't an expert. He used copper pipes, with plastic connectors similar to this: http://www.diy.com/departments/jg-speedfit-plastic-elbow-dia15-mm/34372_BQ.prd
Someone suggested me that it could be that the connectors are not sufficient for the pressure that we get from the mains, and the pressure gradually increases if we don't open the faucets when we are away, so eventually one of the connectors will start leaking.
Others say that the pressure from the mains is constant and this is not the case, but are actually unable to offer an alternative explanation.
Does anyone have any experience with similar problems?