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Mezzanine Floor Staircases

Staircase Design

Staircase design is covered by (amongst others) BS5395: Part 1, BS5395: Part 3 and BS5950: Part 5. General guidance on staircase design is contained within the new Approved Document Part K - 2013 (Section K1 – Stairs, Ladders and Ramps) of Building Regulations. This approved document supersedes previous guidance in Approved Documents Part M and Part K relating to staircases and guard railing.

For consideration of means of escape (MOE) in the event of fire, reference should be made to Approved Document Part B.

Landings

When using our price calculator you need to determine the number of stair landings required. Typical scenarios where they are required are as follows;

Building Regulations Approved Document Part K - 2013 Compliant Stairs/Handrail

There are now a variety of options for staircases within Part K1 – Stairs, and the old Part K and Part M 'ambulant disabled staircase' has been superseded. The following stair options are now available:

General guidance on the new requirement and characteristics are shown below:

All new mezzanine floors are now required to have a minimum of one General Access Stair. Where a floor has only one access stair, it MUST be of the General Access stair.

Where a floor has more than one staircase, at least one must be of a General Access type. All other stairs can be deemed to be for escape purposes only, and be of the Utility 'Escape' stair type. The width and number of stairs required is dependent on the number of persons using the floor area and travel distances.

Where the floor is a plant platform and the only access required is for maintenance, a Utility 'Access' stair is acceptable.

General Access Stair (Industrial):

The General Access Stair (Industrial) would have 1000mm between handrails, have OPEN rises - standard up stand within industrial/storage premises and CLOSED rises - within office/retail premises.

Treads with contrasting nosing will be governed by a rise of 150mm (MIN) to 170mm (MAX) and going of 250mm (MIN) to 400mm (MAX).

The maximum number of rises allowable is 12 rises per flight, except in a 'small and/or restricted' premises, where 16 rises are allowable.

Handrail needs to be contrasting and be a minimum of 50mm diameter (50x25 RHS is acceptable), and this must protrude 300mm beyond both the top and bottom tread nosing, unless it causes an obstruction to a common access route.

General Access Stair (Public Access):

The General Access Stair (Public Access) would be the same as the General Access Stair (Industrial) but would have a clear width between handrails of 1200mm. This stair will always have 'CLOSED' risers as well.

Utility 'Access' Stair (Industrial):

The Utility 'Access' Stair (Industrial) would have a minimum of 800mm between handrails, have OPEN rises.

Treads with contrasting nosing will be governed by a rise of 150mm (MIN) to 190mm (MAX) and going of 250mm (MIN) to 400mm (MAX).

The maximum number of rises allowable is 12 rises per flight, except in a 'small and/or restricted' premises, where 16 rises are allowable.

Handrail needs to be a minimum of 50mm diameter (50x25 RHS is acceptable).

Utility 'Escape' Stair (Industrial):

The Utility 'Escape' Stair (Industrial) would be the same as the Utility 'Access' Stair (Industrial) but would NO contrasting tread nosings, NO restriction on the number of treads - subject to practical limitations e.g. no more than 25 rises.

Other considerations:

An 'Access Strategy Statement' will sometimes overcome the requirement to provide a Disabled Persons Platform Lift by siting the provision of a General Access Stair (for Ambulant Disabled use) in lieu, and assuming that all facilities and areas are replicated on the ground floor accessible areas as are found on the mezzanine level.

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Website last updated 24th January 2014