Riser and Tread
A stair's vertical step height (riser) and horizontal depth (tread). US residential code caps risers at 7¾ inches and requires treads of at least 10. The comfort rule — 2×riser + tread = 24–25 inches — has governed stair layout for three centuries.
Where this appears in real estimates
This term isn't trivia — it's a working variable. These tools use it directly:
- stair calculator — Riser count, rise/run dimensions and stringer length from total rise.…
- deck estimate tool — Deck boards, joists and fasteners from deck dimensions.…
Go deeper
- Sod vs Grass Seed — head-to-head decision guide
- Paver Patio From Dirt to Done — full project walkthrough
- Concrete in Florida — local pricing & climate
- Read the field guide on the blog — practitioner-level detail
- Related engineering article — from our licensed engineer
Reviewed: · Part of the CalculatorAsphalt Construction Glossary · Sources: see methodology & standards.