If a stair has a riser height of 6 3/4", what should the tread width (less nosing) be according to the riser-tread rule?

To determine the appropriate tread width based on the riser height using the riser-tread rule, it is important to look at the typical recommendation that relates the height of the riser to the depth or width of the tread. A commonly used formula is that the sum of the riser height (in inches) and twice the tread width (in inches) should equal approximately 24 to 26 inches.

In this scenario, the riser height is 6 3/4 inches. When using the formula:

1. Calculate the acceptable tread width:

• The general rule suggests that if you add twice the tread width to the riser height, you should get a total of around 24 to 26 inches.

• If we use the midpoint, 25 inches for easier calculations:

• 6 3/4 inches + 2 * tread width = 25 inches.

2. Rearranging gives:

• 2 * tread width = 25 - 6 3/4

• 2 * tread width = 18 1/4

• Tread width = 18 1/4 divided by 2 = 9 1/8 inches.

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