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As part of extending the house, my builder added radiators to my existing central heating system. He used plastic pipes and compression joints to feed the new radiators. He laid these pipes on the new concrete sub-floor and covered them with a 3-inch sand and cement screed that finishes the floor. Over this he "floated" a solid oak plank floor laid on a plastic foam membrane. The heating system worked okay for a while, but then we got a loss of water pressure. It dropped one bar every twelve hours. No leaked water was visible anywhere in the house, so we assumed the leak was under the screed. We searched for it by isolating, in turn, each of two "runs" that feed the new radiators. But we only got a pressure drop of one-tenth of a bar in twelve hours. What might be responsible for the earlier big and constant pressure drops? Why has it apparently repaired itself? Can I trust this "miracle"? What ought I to do now? (Many thanks for any advice)