Stair Tread Sizes

Building codes limit variation to 3 8 10 mm the underside of risers should be sloped or have a 60 angle minimum between nosings and the horizontal surface open risers are not allowed under ada guidelines.

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. Wider stair treads are typically used outdoors while narrower designs between 22 5 inches and 30 inches are more commonly used indoors. Stair treads come in a variety of widths. Stair parts 5 16 in.

Free delivery with 45 order. The tread depth is the distance from the front edge or nosing a tread projection that overhangs the riser below of one step to the front edge or nose of the next step measured horizontally. Riser and tread dimensions should be continuously uniform for safety. Standard stair tread dimensions.

Staircase tread run depth. Set your store to see local availability add to cart. The width of the tread will determine how much of the stair is covered. Stair tread depths shall be 11 inches 279 mm minimum.

Stair treads can be as narrow as 22 5 inches or as wide as 36 inches. Harvard university lists typical tread sizes between 8 and 11 1 2 inches. We offer stair treads in sizes ranging from 24 inches wide up to 36 inches wide as well as 8 inch deep and smaller treads up to 10 inch deep and larger treads. 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.

Here is a drawing detailing our standard stair tread and riser dimensions. 10 to 11 inches minimum a step tread is the flat horizontal surface that you walk on.