Everything You Need to Know About Rise and Tread of Staircase Design
Here's an Updated Video on Figuring Riser Heights - https://youtu.be/PToIsqv687gHow to figure in Centimeters - https://youtu.be/kwynaArzneMhttps://www.homebu.
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You can cheat a bit up or down, but below 17" and more than 19" will result in steps that require strides either too big or too small for most people. On my first stair, r+R was roughly 15 inches—way too far from 18" to be comfortable or safe. The IRC limit gives an r+R of 17 ¾"—pretty darn close to 18.
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Measure horizontally from the front edge (or nosing) of a stair tread backwards to the stair riser. This distance must be at least 10 inches. However, the ICC notes that if the steps do not have nosings, and the steps have solid risers, not open risers, the minimum tread depth is 11 inches.
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The tread depth code for residential stairs should be no less than 10 inches with nosing, no less than 11 inches without nosing, and maximum tread depth variation should also be less than 3/8 of an inch. International Building Code (IBC) Alternately, there are commercial stair code regulations to comply with as well.
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Tread and Nosing. The IRC requires a minimum stair tread depth of 10 inches (254 mm) with a nosing projection of between ¾ and 1 ¼ inches (19-32 mm). The IBC mandates a minimum tread depth of 11 inches (279 mm) for commercial staircases, with nosing projections between ¾ and 1 ½ inches (19-38 mm).
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Treads - The Tread Depth [B] should not be less than 10 inches (254 mm). In a given run of stairs, the Tread Depth [B] should not vary by more than 3/8 inch (9.5 mm). Typically, stair treads are either a single 2x12 or two 2x6s. Number of Steps (Risers) - The number of risers is not necessarily the same as the Steps on Stringer [D].
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Stair tread and riser sizes are integral to staircase design, balancing comfort, safety, and accessibility. Standards exist to ensure a consistent and safe stair-climbing experience. Tread size influences the user's foot placement, with sufficient depth necessary for secure footing. Stair treads have a minimum allowable depth of 11" (28 cm) with riser heights between 4"-7" (10-18 cm).
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The stair treads do not have enough depth - the treads were made from a single 2x6 (so they are 5 1/2" in depth). There is no railing on the steps although the height above ground is more than 30". The deck and platform railing is open with no guardrail balusters. Closed stair treads using a solid riser are shown at the left of the sketch and
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OSHA 1910.25 (c) (3) requires standard stairs to h ave a minimum tread depth of 9.5 inches (24 cm). IBC 1011.5.2 requires that stair treads be 11 inches (279mm) minimum measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the treads leading edge.
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We would need change the stair tread depth to make a 37° slope stair that has an acceptable 7-inch riser height. 7" Riser Height / Tread-Depth-Y = 0.7535 = 37° slope . Again using Mrs. Revere's elementary school algebra instructions, we can re-write the formula as . 7" Riser Height = 0.7535 x Tread-Depth-Y. Tread-Depth-Y = 7" Riser Height / 0.
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Stair Tread Depth. The stair tread is the top surface of a step that you will place your feet on when using the stairs. A stair tread thickness is measured from the front edge of a step to the front edge of the next step. The distance between these two steps should not be less than 10 inches. However, if the steps don't have nosings but have.
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The depth of a stair tread is the horizontal distance from the vertical planes of the foremost projection to adjacent stair treads, as seen from a 90-degree angle to the leading edge of a tread. It measures the available surface area for a person's foot to rest when ascending or descending the stairway. Standard Stair Tread Depth
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The depth of a stair tread should not be less than 10 inches, measured vertically between the leading edges of adjacent treads, according to the International Residential Code (IRC 311.7.5.2). The maximum allowable varitation in tread depth is 3/8 inch.
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IRC Stair Run Requirements. The "run" is the measurement of the tread, which needs to be a minimum of 10 inches if the tread has an overhang on it (see image). This is a measurement from the nose of the tread to the nose of the tread. You are not required to have a nosing/overhang on your stair treads. But if your stairs don't have a.
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29 The general rule (in the US) is 7-11 (a 7 inch rise and 11 inch run) (17.78cm-27.94cm). More exactly, no more than 7 3/4 inches (19.7cm) for the riser (vertical) and a minimum of 10 inches (25.4cm) for the tread (horizontal or step). You can find some more information here as well on other stair-related dimensions.
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• The minimum tread (horizontal piece) depth is 10-inches. • A nosing is required on treads that are less than 11-inches long (IRC - R311.7.5.3). See When is a nosing required on a stair tread? for full details. • The steepest stair allowed has 7-3/4-inch risers and 10-inch treads, but the treads require a nosing.
