Siphon leaking when showering - what damage can occur?

For sinks and sinks a leaky siphon is at most a nuisance - with shower trays but the damage is much larger. What consequences have leaks in the siphon of the shower, who pays for the repair costs, and what to expect in case of damage, read here.

extent of damage

Even small leaks in the shower siphon can release enormous amounts of water over long periods of time.

Even with a smaller gap and a two-person household, one can already count on several cubic meters of water penetrating walls and ceilings. You can expect about 50 liters of used water per shower, of which between 10 and 50% go into the building substance, depending on the size of the leak.

Absolutely perform moisture measurement

The effort for the drying of the building is then correspondingly high, it is important to have a moisture measurement by a specialist company (to at least 20 - 30 cm depth in the walls) carried out in order to determine the extent of damage concrete - even if little is visible from the outside,

repair costs

Depending on local conditions, the repair costs (once regardless of the necessary drying) can be considerable. It may be necessary to fix an existing wall, then close it again and trowel it.


In the assumption of repair costs, it is also technically difficult. With the consequential damage (so-called Durchnässungsschäden) most insurance companies have little problems - but with the elimination of the cause and the cost of replacing the defective siphon. In many insurance siphons are namely not part of the sewer system itself - it is often argued with "improperly leaked tap water" and a cost assumption therefore denied.

Tenants and landlords

In any case, you do not need to fear as a tenant to be asked to pay. In any case, the costs are fully met by the landlord and / or his insurance, provided there is adequate security for this repair.

polluter pays principle

If it is a proven installation error, the executing company is liable in any case. If the installation has been done on its own, this can possibly be problematic and possibly expensive for the installer. In the case of correct installation but faulty or broken material, the executing company is not to blame.

Tips & Tricks

In no case you should do "tricky" installations yourself if you do not have the necessary specialist knowledge and a professional qualification. Ignorance can have very expensive consequences, especially in the area of ​​drinking water installations and sewage installations, where high pressures and large volumes of water are used.

Video Board: Bathroom Fix-It Tips: How to Repair a Leaking Bathtub