Balkonplatten Verlegung

Instructions for laying concrete paving stones on balconies and terraces with a cast concrete surface

Please note the following specificitiesm for laying paving stones on a cast concrete surface, e.g. balcony or terrace:

The cast concrete surface.

Make the cast concrete surface with smooth abrasion and a 2 % slope. If the cast concrete slab is already in place and does not have a slope, apply a sloping unbonded screed with a 2 % slope. The thickness of the screed should be at least 2 cm at the thinnest point.

If there is a usable space under the cast concrete surface, for example a cellar, apply a seal in accordance with DIN 18195 / DIN 18336 with directed water drainage over the sloping unbonding screed.

The water has to go.

In any case, make sure that the slope of your cast concrete surface is sufficient to avoid standing water on the surface. There must be no accumulation of moisture under the laid paving, as this can lead to discoloration, dark edges and possibly to protracted efflorescence.

But even if the slab does not come into direct contact with water, for example when laying on pedestals, there must be no water under the slabs. Reason: If the sun heats the laid slabs, the water would accumulate underneath the slab (condensation). This condensed water rises through the capillaries of the slab and transports notably the unsaturated lime particles in the slab on its surface. Result: stubborn lime efflorescence.

In addition to the slope of the cast concrete surface, create a directed water drainage at the edge of the paving area. Depending on the nature of the soil and the situation, this can consist of a course of gravel, a drainage channel, a rain gutter, etc. This measure also serves to avoid a build-up of moisture.


After checking the supplied paving stones, they can either be laid on

  • pedestals 
  • small mortar bags 
  • gravel bed with a grain size of approx. 8 mm
  • on water-bearing drainage courses in combination with gravel or sand bed or
  • with the help of the METTEN profile system.

Laying on pedestals or small mortar bags:

  • Slabs with size 80x40 should be supported every 40 cm from these pedestals/mortar bags (see drawing 1).

Verlegung auf Stelzlager

  • Slabs with size 60x30 should be supported in center (see drawing 2). 

Verlegung auf wasserführenden Drainageschichten

The best method is laying on water-bearing drainage courses (for example Gutjahr Aquadrain T+). This type of installation is the best way to reduce the risk of moisture build-up. It also enables the joint to be filled, for example with NEROS joint chippings.


Metten Profilsystem

Das Metten Profilsystem ist ein neuartiges und innovatives Profil-Modulsystem, mit dem sich Betonplatten sehr einfach, schnell und kostengünstig verlegen lassen. Das System besteht aus einem Aluminium Rand- und Zwischenprofil, auf denen die Steinplatte auf einer Gummiauflage aufliegen und mittels der steckbaren Abstandshalter ein exakter Fugenabstand/Fugenschnitt gewährleistet wird. Besonders schnell ist die Ausrichtung der Unterkonstruktion. Dabei werden die Randprofile mit der Eckverbindung als Rahmen verbunden und entsprechend ausgerichtet. Da die Zwischenprofile auf den Randprofilen aufliegen, müssen diese lediglich nur noch auf Spannung mit den Unterlegscheiben unterlegt werden. Die Stein- und Betonplatten werden anschließend nur noch in das System eingelegt.