Stair Riser Height And Tread Depth

In your case if you d like a shallower but still comfortable stair you ll need to add one or more risers to what is currently designed then adjust the tread depth aka run staying within the yellow zone on the new graph at the end of the article.

Stair riser height and tread depth.

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. It is not the physical height of the riser because this excludes the thickness of the tread. 10 to 11 inches minimum. It is equal to the number of treads multiplied by the typical tread depth b.

Stair riser height and stair tread depth. The tolerance between the largest and smallest riser height or between the largest and smallest tread depth shall not exceed 0 375 inch 9 5 mm in any flight of stairs. A uniform flight of stairs provides a safety factor. Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using.

7 riser height tread depth y 0 7535 37 slope. Stair treads and risers shall be of uniform size and shape. Staircase tread run depth. Building codes generally.

Regulated by building codes stair details specify the sizes of risers and treads stair widths the placement of handrails and guardrails and construction methods for fabricating stairs. Code states that this should not be greater than 7 3 4 inches 194 mm. For example your floor to floor height as designed might be 118 16 risers at 7 3 8. In a given run of stairs the greatest step height and the smallest step height should not vary more than 3 8 inch 9 5 mm.

The greatest winder tread depth at the 12 inch 305. A step tread is the flat horizontal surface that you walk on. 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. We would need change the stair tread depth to make a 37 slope stair that has an acceptable 7 inch riser height.

The number of risers not the number of treads is used to determine the number of steps that comprise a staircase. Affi et als 2014 and earlier have weighted the contributions of various stair features to the risk of a stair fall considering for example straight versus turned stairways with or without landings number of steps handraiil design lighting specifications and step design specifications using a tread depth of 269mm and a riser height of. Risers the step height f is the typical height of each step.