Stair & stringer guide · 5 min read
Standard vs. flush top-tread mounting
Understand how standard landing and flush top-tread configurations change tread count, total run, stringer length, and attachment planning.
The top detail changes the whole layout
Before laying out a stringer, decide whether the upper landing acts as the final tread or whether the stair receives a dedicated top tread level with that landing. Both can produce equal finished risers, but they do not use the same number of horizontal runs.
Standard: the landing is the final tread
In a standard configuration, the upper deck or landing is the last walking surface. A stair with eight risers therefore has seven stair treads below the landing.
Standard tread count = riser count − 1
- Uses one fewer horizontal run.
- Usually creates a shorter overall stair footprint.
- Requires the stringer-to-header connection to be planned for the selected attachment hardware and framing.
Flush: a dedicated top tread meets the landing
In a flush configuration, a separate top tread finishes level with the landing. Eight risers use eight stair treads, adding one full run to the stair.
Flush tread count = riser count
- Adds one tread depth to total run.
- Increases the required stringer length.
- Changes the upper cut and attachment geometry shown in the calculator diagram.
The calculator illustrates the configuration, not a universal connector detail. Choose fasteners, hangers, blocking, and bearing for the actual structure and local requirements.