Stair Tread Sizes

Riser and tread dimensions should be continuously uniform for safety. 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.

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The stair tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at right angle to the tread s leading edge.

Stair tread sizes.

Stair tread depths shall be 11 inches 279 mm minimum. Red oak and primed reversible riser model 8001087 12 58 12 58. Stair treads can be as narrow as 22 5 inches or as wide as 36 inches. 10 to 11 inches minimum a step tread is the flat horizontal surface that you walk on.

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. 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. 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 parts 5 16 in.

Free delivery with 45 order. Wider stair treads are typically used outdoors while narrower designs between 22 5 inches and 30 inches are more commonly used indoors. Unfinished pine stair tread model 8503e 048 hd00l 10 86 10 86. 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.

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. Staircase tread run depth. Set your store to see local availability add to cart. Stair treads come in a variety of widths.

Standard stair tread dimensions. The width of the tread will determine how much of the stair is covered.

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