Teraplast proposes you further a range of professional floor drains specifically addressed to the customers who want a sure and efficient solution for this small accessory which, unfortunately, after it is installed, in most cases, it becomes a huge problem due to the unpleasant smells in the bathroom.

Floor drains are used as the focal point of floor drainage. In order to obtain a satisfying result the plumber needs to coordinate with the architect, the constructor, the tiler, etc. Therefore, we recommend you to take into consideration the following starting from the design phase


The answer to the question how is the siphon ultimately used is decided when the drainage system is designed. In general, the floor drain is different for permanent use (for example in the shower) and occasional use (as safety drain in the bathroom).

Odour control

There is one thing that has to be avoided at the floor drains that are rarely used: the odour that comes from the drainage system. A classic solution is to use a floor drain with an additional inlet (HL300, HL304). A sanitary appliance used regularly (for example the sink) ensures a fresh water guard. In this case, the siphon needs to be foreseen with a backwater protector that will not allow the water in the sink to drain on the floor.

Another solution for this problem is the range of "PRIMUS" siphons from HL. These siphons are foreseen with a normal odour control device with water guard and a mechanic plug. A floating device is part of the plug. If the water guard evaporates (or it is suctioned by vacuum), the floating device sinks in the siphon and closes it.

Drainage capacity

The test procedure to evaluate the drainage capacity of floor drains is done in accordance with EN 1253-2: 2004, with 20mm of water above the grate. If the floor drain will be used for showers without protection (directly on the floor), the plumber has to make sure that that the leakage rate of the draining siphon is higher than the shower flow, to avoid water access in the dry area of the bathroom..

Hydro insulation

In order to avoid water penetration in the floor, the floor drain needs to be connected to the hydro insulation that it is executed on the spot.

Attention: Tile joints are not watertight!

In most cases waterproofing (usually with liquid compounds, brushable) is done directly under the tiles. HL floor drains are foreseen with flanges on which the plumber can install the proper hydro insulation kit. The plumber together with the tiler need to decide upon the proper kit.

Proper hydro insulation is not ensured through the application of waterproofing material directly on the flange.


The flange level needs to be above the upper level of the slab when the floor drain is installed so that there is a proper inclination for leakage. The main reason of this installation is to make sure that the water on the hydro insulation can be collected in the body of the siphon.

That is why:

Attention: the height of the leaking body is not the minimum height of the slab!


Depending on taste and functionality, you can choose from different types of grates and extensions. The plumber needs to discuss in advance with the beneficiary in order to establish its preferences because it is not always possible to do subsequent changes.