Standard Stair Tread Sizes

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. Stair tread depth is more of an issue for descending rather than ascending stairs. 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.

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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.

Standard stair tread sizes.

A stair stringer is a structural member that supports the treads and risers of a staircase. Because they only sit on the top of the stair the length of the tread is limited to the size of the average step. Further the tread measurement of every tread in a stairway should be as close as possible to identical. Stair details refer to the standard requirements for each of the various components of a flight of stairs.

One on each side and. 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. Standard stair tread dimensions. 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.

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. On the first stairs i built i sized them for a 1 8 riser and a 2 8 tread. 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. 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.

Typically there are three in a staircase. Stair treads come in a variety of colors styles shapes and sizes. Most stair treads measure between 8 and 10 inches long with longer treads being used on. The result was a disastrously uncomfortable stair with treads too short for adult feet.

The maximum deflection shall be l 100 or 40mm whichever is the lesser over the horizontal span l of the stairway between supports. Mike guertin s prohome adjusted dimensions. Here is a drawing detailing our standard stair tread and riser dimensions. Harvard university lists typical tread sizes between 8 and 11 1 2 inches.

The greatest tread depth within a flight of stairs cannot be more than 3 8 inch larger than the smallest tread depth. Length most stair treads are not made to wrap around the lip of the stair.

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