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Technical requirements relating to design, construction and installation of spiral staircases.
The design of all staircases, spiral or otherwise, is governed by Part K of Building Regulations. However, paragraph 1.21 of Part K states that spiral and helical staircases comply with Building Regulations if they are designed to comply with British Standard BS5395 Part II (Code of Practice for the design of helical and spiral stairs 1984). In essence this means a greater degree of flexibility in design than using the criteria for tapered treads laid down in Part K, particularly with regard to intermediate and floor level landings, inner goings and numbers of risers per flight. In addition to this, Parts B (Means of Escape) and M (Access for Disabled) of Building Regulations also apply to spiral stairs in certain situations. External stairways over six metres in height may also require weather protection, such as balustrade panels and canopy roofing.
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Category
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Description
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Rise Per Tread
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Min Clear Width
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Min Going Centre
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A
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Small private stair intended to be used by a limited number of people who are generally familiar with stair e.g internal stair in dwelling service one room not being a living room or kitchen, access stair to a small room or plant in a
office, shop, factory, not used by the public, or fire escape for small number of people. |
170 - 220
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600
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145
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B
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Private stair similar to category A, but also providing the main access to the upper floor of a private dwelling. |
170 - 220
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800
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190
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C
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Small semi-public stair intended to be used by a limited number of people, some of whom may be unfamiliar with stair eg stair in factory, office, shop or common stair serving more than one dwelling. |
170 - 220
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800
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230
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D
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Semi-public stair intended to be used by larger numbers of people, some of whom may be unfamiliar with stair eg stair in factory, office, shop or common stair serving more than one dwelling. |
150 - 190
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900
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250
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E
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Public stair intended to be used by large numbers of people at one time eg stair in place of public assembly |
150 - 190
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1000
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250
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Please consult with our Technical Department for further advice on all aspects of Building Regulations. We strongly recommend that all customers liaise with their local authority Building Control department or District Surveyor to ascertain the exact requirement for the individual situation.
If you wish to discuss any current or future projects without obligation please call us: Tel: 01326 574497
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Technical
