What is EN 1433?
EN 1433 is the European standard for drainage channels for vehicular and pedestrian areas. It defines the load classes used to classify the structural performance of channel drainage systems. A channel carrying an EN 1433 load class designation has been assessed for that classification under the test conditions defined by the standard — this does not guarantee the product is suitable for every installation of that type.
Load Class Summary
| Class | Typical Use | Materials | Forti Nova Products |
|---|---|---|---|
| A15 | Patios, garden paths, pedestrian areas | Polypropylene, polymer concrete | Domestic A15 range |
| B125 | Residential driveways, light vehicle areas | Polypropylene, polymer concrete | Driveway B125 range |
| C250 | Commercial car parks, kerbsides | Polymer concrete | Commercial C250 range |
| D400 | Roads, heavy vehicle routes, industrial access | Polymer concrete | Industrial D400 range |
| F900 | Aircraft stands, ports, extreme industry | Polymer concrete | Industrial F900 range |
A15 — Pedestrian Areas
A15 is the load classification for pedestrian and landscaped areas where no vehicle access occurs. It is appropriate for domestic patios, garden paths and pedestrian walkways. A15 products must not be used in areas where vehicles cross the channel — even infrequently. Where there is any possibility of vehicle crossing, B125 is required.
View A15 products and full guidanceB125 — Driveways and Light Vehicle Areas
B125 is commonly specified for residential driveways and light vehicle areas. It is a documented load classification under EN 1433, commonly considered for suitable driveway and light-vehicle applications. Final suitability depends on traffic position, installation detail and the manufacturer's technical requirements. Do not assume B125 is suitable for commercial vehicle access without specific confirmation.
View B125 products and full guidanceC250 — Commercial and Kerbside
C250 is typically specified for commercial car parks, kerbside areas and appropriate medium commercial environments. For sites receiving regular HGV delivery traffic, D400 should be considered as a minimum. C250 products are generally polymer concrete construction.
View C250 products and full guidanceD400 — Roads and Heavy Vehicle Areas
D400 is the standard classification for road and heavy vehicle drainage. It is required for roads, highway drainage, HGV access routes and industrial roads. Correct installation to manufacturer requirements is essential — do not assume the load class applies independent of installation quality.
View D400 products and full guidanceF900 — Extreme Duty
F900 is the highest load class under EN 1433, specified for extreme environments such as aircraft stands, port facilities and heavy industrial sites where D400 is insufficient. Project-specific engineering assessment is required before F900 products are specified.
View F900 products and full guidanceWhat the Load Class Does Not Guarantee
The load class designation is a test result under defined conditions — it is not a universal installation guarantee. The actual performance of any installed channel depends on the quality of the installation, the bedding, the concrete surround, the sub-base preparation and the specific loading pattern in use. A correctly specified product installed incorrectly may not achieve its documented classification.