Stair Tread Riser Dimensions

Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum.

Stair tread riser dimensions.

Details are at stair tread dimensions. Headroom is the vertical dimension from the stair treads to the ceiling directly above. Building codes generally suggest that the maximum height of a riser be 7 75 inches 19 7 cm nosing. International building code for stair treads and risers 1009 3 stair treads and risers.

Stair riser height and stair tread depth. For code requirements the minimum staircase width is the horizontal dimension between the sidewalls of a staircase measured above the handrail s. 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.

1 or greater tread is supported by the riser. It is measured. All risers and all goings in the same flight of stairs shall be of uniform dimensions within a tolerance of 5 mm. The number of risers not the number of treads is used to determine the number of steps that comprise a staircase.

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. 8 1 4 to 9 stair tread thickness. The riser height shall be measured vertically between the leading edges of adjacent treads. As general rules of thumb for achieving comfortable relationships between riser and tread dimensions the following formulas can be used.

Stair tread depths shall be 11 inches 279 mm minimum. Stairways guardrail and handrails. Required 1 to 1 1 2 projection beyond the riser face. The nosing is the protrusion at the edge of a tread that hangs over the riser below.

Standard stair tread dimensions. Here is a drawing detailing our standard stair tread and riser dimensions. Width refers to the length of risers and treads from side to side. Stair tread run or horizontal depth.

A uniform flight of stairs provides a safety factor. 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. Not all steps have a nosing but when. Definition of detailed specifications for open riser stairs.

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. Have a maximum riser height of 9 5 inches 24 cm. Tread inches 2x riser inches 24 25 26 for exterior stairs riser inches x tread inches 72 75.