Standard vs. flush top-tread mounting

Choose the top detail before choosing the stock

Using the landing as the last walking surface can keep the stair footprint shorter. It often suits a flight where there is no reason to add another level tread at the top. A dedicated flush top tread can suit a planned transition into the landing, but adds a horizontal tread position and changes the upper stringer connection.

Neither arrangement is automatically more comfortable: the repeated finished rise and run still govern the sloped flight. Decide how the stair will meet the landing and be attached, then confirm the space it occupies. In this guide, “standard” and “flush” describe these two specific top-tread arrangements, rather than every detail sold under those names.

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.

Separate the footprint from the rail slope

For eight 7.5-inch risers and a 10-inch run, standard mode has a 70-inch footprint; flush mode has an 80-inch footprint. Both have seven sloped intervals from the first nosing to the highest nosing. The extra flush tread is a level segment at the top. Add its landing rail and returns separately.