Eating system leak. Try pouring inexpensive sent into the heating system, to locate the leak.
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Drain leaks are often misdiagnosed. Drains and wastewater under buildings can behave like rising damp (which comes from groundwater). While chemical damp proofing treatment and slurry can slow down the effects of a broken drain, the water could go on to cause greater damage, such as rot, subsidance, heave, and is liable to need retreatment until the cracked drain is dealt with. The cost of fixing broken drains is normally considerable less expensive than chemical damp proofing.