Once an infiltration system is underground, it has to perform at its best over the long term. Expert Rob Driessen explains how stone wool elements provide a reliable and sustainable solution.


"When the Rockflow elements are unloaded, people often react with astonishment," explains Rob Driessen, Rockflow infiltration systems expert. "Stone wool is not readily associated with an infiltration system that has sufficient load-bearing capacity for lorries to drive over it." Yet this is perfectly feasible, provided the system is set up in the right way.

Is stone wool strong enough?

"The most frequently asked questions about stone wool infiltration systems relate to their strength," says Driessen. "People wonder if it will hold up."

To illustrate just how sturdy stone wool is, Driessen often suggests placing five Rockflow elements side by side on a flat surface. "Then try to take out the middle one. You won't be able to. This is because the fibres of the material mesh together, so there's an enormous amount of friction, which provides strength."

In addition, stone wool also has the strong and durable properties of the basalt stone from which it is made. The structure of the infiltration elements is also designed to make the stone wool extra strong. "You notice that when you try to press it in by hand," says Driessen. "That's almost impossible. This is because the element consists of a 3D network of stone fibres."

What are the basic guidelines for 'correct installation' of stone wool infiltration systems?

To get the most out of a stone wool infiltration system, correct installation is crucial.

In practice, this means taking into account a few basic guidelines:

  • The fibres that make up the elements are oriented in one direction. To achieve the maximum strength properties, the fibre direction of the elements must be the same when they are installed. This is why Rockflow elements always stand upright.
  • Only when the sides are filled with sand and the top is covered with a layer of sand or granulate is it possible to drive over the buffer with light equipment.
  • During installation, make sure that you do not work with equipment that is too heavy. An installation manual is available for the axle loads. After the top layer has hardened, heavy equipment can stand on the stone wool without any problems.

No hassle

"A convenient advantage of Rockflow is that no special equipment is needed," says Driessen. "Provided the specified maximum axle and wheel loads are taken into account." In terms of installation, stone wool elements provide a number of other notable advantages. Rockflow elements are simple and flexible. Installation is therefore fast and easy. This makes Rockflow very suitable for applications in built-up areas where it can be easily adapted to cables and pipes that are also underground. You can saw an element around a pipe, so to speak.

Rockflow in practice

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