Don t forget though this is for a commercial property.
Standard stair tread size uk.
For people with disabilities the minimum tread size is 27 5 cm 11 inches which would be the effective minimum and likely the average size of the tread for any stairs built for public use.
This may not be practical or necessary for your home where your stairs do not have to meet the same commercial standards but they should be used as.
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A stair with kite winders normally has a combination of straight treads and winder treads.
Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
Building regulations for stairs uk.
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Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using the stairs.
In order to meet building regulations the winder treads are both equal and greater than the straight.
These regulations recommend the stair rise to be no more than 7 75 inches 17 78 cm and stair run to be no less than 10 inches 25 4 cm.
Harvard university lists typical tread sizes between 20 and 28 7 cm 8 and 11 1 2 inches.
Further the tread measurement of every tread in a stairway should be as close as possible to identical.
Stair tread depth is more of an issue for descending rather than ascending stairs.
Standard risers are around 200mm so aim for this.
Stair details refer to the standard requirements for each of the various components of a flight of stairs.
The rule for all treads states twice the individual rise plus the going must be 500mm and 700mm which can be a problem with 2 kit winder boxes.
This free stair calculator determines stair parameters such as rise total run and angle stringer length based on height run tread and headroom requirement.
A uniform flight of stairs provides a safety factor.
Regulated by building codes stair details specify the sizes of risers and treads stair widths the placement of handrails and guardrails and construction methods for fabricating stairs.
Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies.
However the americans with disabilities act ada lists the minimum tread size as 11 inches which would be the effective minimum and likely the average size of the tread for any stairs built for public use.
