Stair Tread Riser Dimensions

International building code for stair treads and risers 1009 3 stair treads and risers.
Stair tread riser dimensions. Stair tread run or horizontal depth. Tread inches 2x riser inches 24 25 26 for exterior stairs riser inches x tread inches 72 75. Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum. At stair riser specifications and at stair dimensions width height you ll read that stair risers should be 7 inches 178 mm maximum and 4 inches 102 mm minimum.
The number of risers not the number of treads is used to determine the number of steps that comprise a staircase. Not all steps have a nosing but when. The riser height shall be measured vertically between the leading edges of adjacent treads. 8 1 4 to 9 stair tread thickness.
It is measured. Have a maximum riser height of 9 5 inches 24 cm. 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. As general rules of thumb for achieving comfortable relationships between riser and tread dimensions the following formulas can be used.
Except where there is a fixed structure within 100 mm of the stairway stile stairways and stairway landings shall be provided with guardrailing on any exposed side. Building codes generally suggest that the maximum height of a riser be 7 75 inches 19 7 cm nosing. Here is a drawing detailing our standard stair tread and riser dimensions. Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using.
Headroom is the vertical dimension from the stair treads to the ceiling directly above. 1910 25 d 3 have a minimum headroom above spiral stair treads of at least 6 feet 6 inches 2 m measured from the leading edge of the tread. The nosing is the protrusion at the edge of a tread that hangs over the riser below. Details are at stair tread dimensions.
For code requirements the minimum staircase width is the horizontal dimension between the sidewalls of a staircase measured above the handrail s. A uniform flight of stairs provides a safety factor. Stairways guardrail and handrails. All risers and all goings in the same flight of stairs shall be of uniform dimensions within a tolerance of 5 mm.
Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies. 1 or greater tread is supported by the riser. Stair riser height and stair tread depth. Definition of detailed specifications for open riser stairs.
Required 1 to 1 1 2 projection beyond the riser face. Standard stair tread dimensions. We would need change the stair tread depth to make a 37 slope stair that has an acceptable 7 inch riser height.