What Load Class Does Your Site Need? — Quick Reference

No vehicle loading above the tank. Cover depth is set mainly by landscaping/turf requirements rather than structural load.

• Confirm finished-surface type (turf, pavers, garden bed)
• Still requires geotextile wrap and correct backfill compaction

Confirm this class for your site →

Indicative cover depth for light passenger-vehicle traffic — driveways and standard car parking bays.

• Confirm exact figure against your module’s stated load class
• Backfill and compaction must match the specified load class

Confirm this class for your site →

Indicative cover depth for heavy vehicle traffic — loading docks, truck routes, commercial car parks.

• Structural sign-off from your engineer is typically required at this class
• Confirm against CIRIA C737 long-term compressive testing data for the module family

Confirm this class for your site →