History of Treads and Risers
| Element | Description | Element Code | Essential | Uniclass 2015 | Updates |
|---|---|---|---|---|---|
| Treads and Risers | The alternating horizontal (treads) and vertical (risers) elements that make up a set of steps. | TRR | Yes | Pr_25_30_90 | 27-04-2021 |
| Treads and Risers | The alternating horizontal (treads) and vertical (risers) elements that make up a set of steps. | TRR | Yes | Pr_25_30_90 | 11-04-2023 |