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Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
Standard stair tread sizes. 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. Stair treads come in a variety of colors styles shapes and sizes. Mike guertin s prohome adjusted dimensions. Here is a drawing detailing our standard stair tread and riser dimensions.
A stair stringer is a structural member that supports the treads and risers of a staircase. Stair details refer to the standard requirements for each of the various components of a flight of stairs. These dimensions may be useful when laying out a staircase or if you have general questions about the size and shape of a traditional tread or a retro tread. Rise r 8 run r 9 1 4 r r 17 1 4 good 2r r 25 1 4 almost perfect stairs will be comfortable.
Further the tread measurement of every tread in a stairway should be as close as possible to identical. The result was a disastrously uncomfortable stair with treads too short for adult feet. Treads shall have a minimum live loading of 2 5 kpa or a 2 2 kn per linear metre or minimum point loading of 1 5 kn applied on 100mm 100 mm pad on each step whichever loading produces the more adverse effect. 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.
Typically there are three in a staircase. We include a table giving standard access ramp ladder and stair specifications for slope angle and rise run measurements for stair treads for various types of stairs ramps and ladders. Most stair treads measure between 8 and 10 inches long with longer treads being used on. One on each side and.
Similarly handrails must be between 34 and 38 96 52 inches high measured from the top of the treads with a diameter between 1 25 inches 3 18 cm and 2 675 inches 6 79 cm. Length most stair treads are not made to wrap around the lip of the stair. The maximum deflection shall be l 100 or 40mm whichever is the lesser over the horizontal span l of the stairway between supports. We describe how to translate the stair rise and run into a specific number of stair treads and risers that will be uniform and of proper safe dimension.
Stair tread depth is more of an issue for descending rather than ascending stairs. The greatest tread depth within a flight of stairs cannot be more than 3 8 inch larger than the smallest tread depth.
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