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Stair pitch

Headroom Rise and going

Guidance Diagram 52: Measuring rise and goings (not to scale) Landings

Stair width Handrails

Internal guarding (external guarding details below) Length of flights

Guidance Diagram 53: Typical internal stair case and guarding construction details Guidance Diagram 54: Typical internal tapered tread stair case

Typical internal staircase construction details

External stairs, guarding and landings for changes in level of 600mm or more External stairs and landings

External guarding

Guarding to upper storey window openings/other openings within 800mm of floor level Loft conversion stairs

Reduced headroom to stairs in loft conversions

Guidance Diagram 55: Reduced headroom to stairs in loft conversions Alternating tread stairs for loft conversions

Guidance Diagram 56: Alternating tread stairs for loft conversions Fixed Ladders for loft conversions

Ramps

Protection against impact with glazing Glazing in critical locations

Guidance Diagram 57: Critical locations for use of safety glass in doors/side screens and windows

Marking of safety glass

Part K: Protection from falling, collision and impact (including glazing)

Internal stairs, guarding and landings for changes in level of 600mm

or more

Private stairs (used for only one dwelling) to be constructed in accordance with BS 5395 and BS 585 as detailed in the following guidance details and diagrams below:-

(Spiral and helical stairs to be designed to BS 5395: Part 2) Stair pitch

Stair pitch must not to exceed 42° Headroom

Stair to have a minimum headroom of 2m above the pitch line of the stairs Rise and going

Rise and going to be level and equal to all steps and to fall within the following separate classes:-

 Any rise between 155mm-220mm used with any going between 245mm- 260mm, or

 Any rise between 165mm-200mm used with any going between 223mm- 300mm.

Guidance Diagram 52: Measuring rise and goings (not to scale) See Diagrams 1.1, 1.2 & Table 1.1 of ADK for full details

tread Open riser treads should over lap at least 16mm

nosing riser

top surface of tread rise

top surface of tread Note: going dimention to

be measured from nosing to nosing

going

Landings

Landings to be provided at the top and bottom of the stair equal in length to the width of the stairs and clear of any door opening onto it. If a door open across the bottom of a landing (or cupboard doors open in a similar at the top and bottom of a flight) a clear 400mm space must be

maintained across the width of the flight. in compliance with Diagrams 1.7 and 1.8 of ADK Stair width

There is no minimum stair width for new extensions or replacement stairs in existing dwellings but should be safe and practicable. Treads should be slip resistant where open to the

weather or in wet areas. Handrails

Handrails must be provided on one side of the stairs if they are less than 1m wide and they should have one on each side if they are wider. Handrails to provide a firm handhold with a minimum clearance of 25 - 50mm between the handrail and wall to prevent trapping of hands and securely fixed at a height 900-1000mm above floor/nosing levels and must be continuous throughout their length.

Internal guarding (external guarding details below)

Stair flights, landings, ramps and edges of internal floors to be guarded at a minimum height of 900mm, measured from the floor/pitch line of the stairs (across the nosings) to the top of the handrail and be continuous throughout their length, fitted with non climbable vertical balustrading, with no gaps to exceeding 100mm (in which a 100mm diameter sphere cannot pass through) and all constructed to resist a horizontal force of 0.36kN/m. All open treads, gaps etc should not exceed 100mm. See Diagram 3.1 of ADK for full details and BS6180 for protective barrier details. Length of flights

Stairs having more than 36 risers in consecutive flights should have a landing between flights which should be equal in length to the width of the stairs and make a change of direction of at

Guidance Diagram 53: Typical internal stair case and guarding construction details (not to scale) See diagram 1.3 of ADK for full details

At least 2000mm clear head room (can be reduced to 1900mm at the centre of the stairs & 1800mm at the side in loft conversions)

Handrail & guarding at least 900mm high above landing level

Newel

post Handrail & guarding at least 900mm high

above pitch line non climable balustrades

& no gaps to exceed 100mm trimmer joists Landing Landings must be level & equal in length to the smallest width

Note: No opening to allow tread

rise

All guarding must resist a horizontal

force of 0.36kn/m

pitch line

At least 2000mm clear head room (can be reduced to 1900mm at the centre of the stairs & 1800mm at the side in loft conversions)

Handrail to be at least one side of the stairs upto 1.0m wide & the passage of 100mm diam

sphere outer string Max

both sides if wider. Handrail height to be between 900-1000mm above pitch line of stairs or floor 42 degree

pitch

Flight Landing Note: Landings to be clear of any obstructions. A door may swing accross a landing at the bottom of a flight but must allow a 400mm min clear space accross the full width of the flight clear of any door swing

Guidance Diagram 54: Typical internal tapered tread stair case (not to scale) The rise of tapered treads should be uniform and equal to the rise of the straight flight.

The going on the tapered treads should be uniform and equal to the going of the straight flights as measured on the centre line of the stairs as detailed in the guidance diagram below.

(See Diagram 1.9 of ADK for full details)

The rise of the tapered treads should be uniform and equal to the rise of the straight flights

The goings on the tapered treads should be uniform and equal to the going of the straight flights as measured on the centre line of the stairs

Minimum going 50mm

Centre line of stairs

Typical internal staircase construction details

Typical staircase construction details: side strings ex. 230 X 35mm, capping ex. 32 X 63mm, treads 25mm thick, risers in 12.5mm thick plywood, newel posts ex. 75 X 75mm, handrails ex. 75 X 63mm, balustrades ex. 32 X 32mm at 125mm ctrs fixed into proprietary timber head and base rebated capping.

External stairs, guarding and landings for changes in level of 600mm