Stairs tread
Regulations for the design and construction of stairs are set out in Part K of the building regulations, and compliant designs are described in Approved Document K - Protection from falling, collision and impact.
The treads of stairs are the horizontal parts which people step on.
The leading edge of the tread is described as the ‘nosing’. In buildings other than dwellings, the nosing should be visually contrasting, and a suitable tread nosing profile, should be used. See nosing for more information.
Steps should have level treads with the rise and going of each step consistent throughout a flight of steps and are in accordance with the table below.
In buildings other than dwellings, risers should not be open to avoid feet or walking aids being caught underneath the tread during ascent, possibly causing a fall or giving occupants a feeling of insecurity. For dwellings, steps may have open risers if treads overlap by a minimum of 16 mm and steps are constructed so that a 100 mm diameter sphere cannot pass through the open risers.
A tapered tread is a step in which the going reduces from one side to the other. Where stairs have tapered treads, consecutive treads should use the same going. If a stair consists of straight and tapered treads, the going of the tapered treads should not be less than the going of the straight treads.
Alternating tread stairs are stairs with paddle-shaped treads where the wide portion is on alternate sides on consecutive treads. In dwellings, alternating tread stairs may only be used in loft conversions where there is not enough space for conventional stairs and where the stair is for access to only one habitable room and, if desired, a bathroom and/or a WC (although this must not be the only WC in the dwelling).
Alternating tread stairs should; make alternating steps uniform with parallel nosings, have slip-resistant surfaces on treads, have tread sizes over the wider part of the step in line with the table above, should provide a minimum clear headroom of 2 m, should be constructed so that a 100 mm diameter sphere cannot pass through the open risers and should comply with the diagram below.
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Cladding remediation programmes, transparency and target date.
National Audit Office issue report on cladding remediation.
HBPT and BEAMS Jubilees. Book review.
Does the first Labour budget deliver for the built environment?
What does the UK Budget mean for electrical contractors?
Mixed response as business pays, are there silver linings?
A brownfield housing boost for Liverpool
A 56 million investment from Homes England now approved.
Fostering a future-ready workforce through collaboration
Collaborative Futures: Competence, Capability and Capacity, published and available for download.
Considerate Constructors Scheme acquires Building A Safer Future
Acquisition defines a new era for safety in construction.
AT Awards evening 2024; the winners and finalists
Recognising professionals with outstanding achievements.
Reactions to the Autumn Budget announcement
And key elements of the quoted budget to rebuild Britain.
Chancellor of the Exchequer delivers Budget
Repairing, fixing, rebuilding, protecting and strengthening.
Expectation management in building design
Interest, management, occupant satisfaction and the performance gap.
Connecting conservation research and practice with IHBC
State of the art heritage research & practice and guidance.
Innovative Silica Safety Toolkit
Receives funding boost in memory of construction visionary.
Gentle density and the current context of planning changes
How should designers deliver it now as it appears in NPPF.
Sustainable Futures. Redefining Retrofit for Net Zero Living
More speakers confirmed for BSRIA Briefing 2024.
Making the most of urban land: Brownfield Passports
Policy paper in brief with industry responses welcomed.
The boundaries and networks of the Magonsæte.