The Approved Document K represents an attempt to reorganize matters; these commence with standard definitions.

• Containment - a barrier to prevent people falling from a floor to the storey below.

• Flight - the section of a ramp or stair running between landings with a continuous slope or series of steps.

• Ramp - a slope which is steeper than 1 in 20 intended to enable pedestrians or wheelchair users to get from one floor level to another.

• Stair - steps and landings designed to enable pedestrians to get to different levels.

• Private stairs - stairs in or serving only one dwelling.

• Institutional and assembly stairs -stairs serving places where a substantial number of people gather.

• Other stairs - stairs serving all other buildings apart from those referred to above.

• Going - the distance measured in plan across the tread less any overlap with the next tread above (Figure 10.1a).

• Rise - the vertical distance between the top surfaces of two consecutive treads (Figure 10.1a).

• Pitch line - a notional line connecting the nosings of all treads in a flight. The line forms the greatest possible angle with the horizontal, subject to the special recommendations for tapered treads.

Figure 10.1a General requirements under Section K: Rise and going

• Pitch - the angle between the pitch line and horizontal (Figure 10.1b).

• Alternative tread stairs - stairs with paddle shaped treads where the wider portion alternates from one side to the other on each consecutive treads (Figure 10.1 d).

• Helical stairs - stairs which form a helix round a central void.

• Spiral stairs - stairs which form a helix round a central column.

• Ladder - a series of rungs or narrow treads used as a means of access from one level to another which is normally used by a person facing the ladder.

• Tapered tread - a tread with a nosing which is not parallel to the nosing of the tread or landing above it.

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