Johnson Level & Tool Mfg. RAS-1 User Manual
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The outside step corners should now be marked off (again
see Figure 18). Starting from the bottom plumb line, mea-
sure up along the top edge of the stringer the distance of
a step incline. Repeat this for each step corner, until you’ve
reached the stringer incline length. Make another step
incline mark for a top plumb line.
Now draw the riser plumb lines for all the steps, using
the square as you did for the bottom plumb line. Finally,
draw a top plumb line. Using the same procedure as you
did for the bottom floor line, draw all the step tread lines
(see Figure 19). Be sure to measure down the riser plumb
line the distance of the step rise only. Make the last tread
line which will be the top floor line. If the stringer is to go
below the top floor boards, add the floor board thickness
to the step rise when measuring down the top plumb line
to draw the top floor line (this is to be done when the
bottom floor line was found by not taking into account
the tread thickness). If the tread thickness was used, add
the difference between the floor board thickness and the
tread thickness.
STEP 3. CUTTING STRINGER PATTERN: The stringer
pattern should be ready to cut, except for any special al-
lowances for anchoring the top of the stringer. Once that
is laid out, you may want to clamp both stringers together
before cutting to be sure the stringers are identical.