TerraSystem permeable paving bonds crushed stone and granulate at their contact points into a seamless, load-bearing surface with about 40% voids. Rainwater soaks straight into the ground, so the surface can be laid level, without a drainage slope and largely without sewers. For paths, squares, car parks and roads; installed by TerraSystem's own technical crew.
Permeable paving is a road and path surface in which each grain is coated with binder and bonded to its neighbours only at the contact points. The open spaces between the grains, about 40% of the volume, let water pass through the surface into the ground.
It can supplement or replace asphalt and concrete. Because water does not run off, the surface needs no drainage slope, aquaplaning does not occur and there is less spray. It is classified in water hazard class 0 (WGK 0).
Rainwater returns to the ground instead of the sewer
No drainage slope or gullies needed
Elastic, dimensionally stable and frost-resistant
From footpaths to roads with heavy traffic.
Park paths, pedestrian zones and town squares with a seamless, puddle-free surface.
Parking areas and access roads that drain on the spot.
With a 15 cm base course and a 4 cm surface course it is suitable for heavy traffic.
Smooth, skid-resistant surfaces in many colours.
Unsealed surfaces that reduce run-off and sealing charges.
Permeable surfaces around trees; see our tree grate systems.
No aquaplaning, less splash water, less ice formation
Rainwater soaks away: smaller or no storm sewers
No frost damage: the voids leave room for water to expand
Temperature-resistant from –30 to +100 °C; no rutting in heat
Noise is absorbed in the surface instead of being reflected
Water hazard class 0: no leaching of harmful substances
Easy to clean; repairs blend in without visible joints
Installed by TerraSystem's own technical crew
Two-layer sandwich construction: a bonded base course and a surface course, max. 19 cm in total, instead of the usual 3 to 5 asphalt layers.
| Property | Value |
|---|---|
| Voids (porosity) | approx. 40% |
| Compressive strength | up to 45 N/mm² |
| Bending tensile strength | up to 20 N/mm² |
| Tensile strength | min. 13.2 N/mm² (base course) / 12.3 N/mm² (surface course) |
| Temperature range | –30 to +100 °C |
| Base course | 10–15 cm, crushed stone 8/11 to 11/16 mm, sprayed with binder |
| Surface course | 2–4 cm, granulate mixed with binder, rolled |
| Heavy traffic | 15 cm base course + 4 cm surface course |
| Load-bearing | after 24 hours |
| Noise | –8 dB vs. standard asphalt at 50 km/h; 2–3 dB below OPA2 open-pore asphalt |
| Permeability over time | no significant reduction after 10 years (surface 1–3 mm; Mannheim and Freiburg) |
| Water hazard class | WGK 0 |
Sources: TU Munich research reports 2362 and 2385 (2007); LGA Bautechnik BBV 0313264; Müller-BBM M60 586/1; Marth frost resistance report 8307; Terra System GmbH technical documentation.
Area, use (pedestrians, cars, trucks) and existing substrate; photos and a plan are enough.
Choice of layer build-up and granulate: colour and grain size.
A quote based on area, build-up and site conditions.
TerraSystem's own crew lays the base and surface courses with standard road-building equipment; load-bearing after 24 hours.
Klar Chem is the authorized distributor of Terra System GmbH in 24 countries. We are your contact for system selection, technical documents, samples and quotes. On every project the installation is carried out by TerraSystem's own technical crew, so workmanship and warranty come from the manufacturer.
A surface of stone and granulate bonded at their contact points, with about 40% voids, so that water drains through it into the ground.
Yes. With a 15 cm base course and a 4 cm surface course it is suitable for heavy traffic. In TU Munich tests no rutting occurred at a tyre contact pressure of up to 0.8 N/mm².
Long-term tests in Mannheim and Freiburg showed no significant reduction in seepage after 10 years with a 1–3 mm surface; normal street cleaning keeps the pores open.
Yes. The voids give water room to expand, so frost damage and potholes do not occur.
It depends on the area, traffic load, build-up and site. Send us the area and use and we will prepare a quote. Savings on drainage and sewers belong in the comparison.
TerraSystem's own technical crew on every project. Klar Chem is your contact for design, quotes and coordination.
Tell us the area, use and existing substrate. We will recommend a build-up and send you a quote.
