NCIDQ Interior Design Professional Exam (IDPX) Practice Exam

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What is an acceptable combination of riser and tread sizes for residential stairs?

6" riser and 15" tread

7" riser and 11" tread

7.5" riser and 11" tread

None of these - all sizes are acceptable

In residential stair design, the combination of riser and tread sizes is governed by comfort and safety standards. The most commonly accepted dimensions suggest that the rise (the height of the step) should typically be between 4 and 7.5 inches, while the tread (the depth of the step) should be between 11 to 12 inches.

The combination of a 7" riser and an 11" tread, as well as a 7.5" riser with the same 11" tread, both fall within these acceptable limits. These sizes ensure that the stairs meet the aesthetic, functional, and safety requirements.

Since all options presented in the question adhere to these general guidelines, stating that "none of these" options presents unacceptable sizes is also valid. Understanding these dimensions is crucial for ensuring that residential stairs are safe and comfortable for use, highlighting that there is flexibility in acceptable dimensions as long as they remain within these ranges.

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