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6.2 External ramps design criteria

Surface - non-slip.
Width - surface width 1800mm preferred, 1200mm minimum (1000mm unobstructed)
Gradients - 1:20 preferred, 1:12 minimum
Alignment - slopes should be straight, where any turns on level landings
Length of ramp between landings/level areas - 5m - 10m for a 1:15 to 1:20 gradient, less than 5m for a 1:12 to 1:15 gradient
Landings - to be level, and clear of any door swing. Top & bottom - 1800mm preferred, 1200mm minimum. Intermediate - 1800mm preferred, 1500 minimum
Sides - any open edge should have a raised kerb 100mm high
Handrails - at two levels, both sides, continuous (for ramps more than 2000mm long). Top of upper handrails 900mm above surface of ramp and 1000mm above surface of landing. Top of lower handrails 650mm above surface of ramp and 750mm above surface of landing. Extends 450mm (300mm min) beyond top/bottom of ramp with a closed end.