Johnson Level & Tool Mfg. RAS-1 - Manual (Page 30)

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STAIR LAYOUT EXAMPLE
With our square, stair layout can be done simply and
efficiently. The layout can be done without hours of calcula-
tions. Basic math and the use of a calculator with a square
root function are all that are needed.
STEP 1. FIND STEP MEASUREMENTS: We start with the to-
tal rise (see Figure 17) to find the number of steps required.
If the rise is not known, measure the vertical distance
between the lower finished floor and the upper one. When-
ever a quantity is known, use it instead of calculating it.
NOTE 1 Before starting your layout, check local and state
codes for tread width, length and step rise requirements.
Many states have stairway construction regulations.
NOTE 2 It’s a good idea to check your layout on paper or
cardboard before cutting out the wood steps.
FIG. 17 Stair Layout.