This page is part of the staircase design series.
Standard stair tread size uk.
Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
In order to meet building regulations the winder treads are both equal and greater than the straight.
Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies.
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.
Stair details refer to the standard requirements for each of the various components of a flight of stairs.
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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.
The tread size min 10ins 25 4cm is dictated by the average adult foot size although it is not necessary to be able to fit your entire foot on a tread in order for walking up the stairs to be both comfortable and safe.
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.
This free stair calculator determines stair parameters such as rise total run and angle stringer length based on height run tread and headroom requirement.
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.
A uniform flight of stairs provides a safety factor.
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.
A stair with kite winders normally has a combination of straight treads and winder treads.
Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using the 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.
Further the tread measurement of every tread in a stairway should be as close as possible to identical.
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Stair tread depth is more of an issue for descending rather than ascending stairs.
Standard risers are around 200mm so aim for this.
The greatest tread depth within a flight of stairs cannot be more than 3 8 inch larger than the smallest tread depth.