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How To Layout A Stringer When The Top Step Is Attached To The Floor Frame

Figure 46 shows a set of stairs forming a right triangle. Only one-half the stairs are shown. The Pythagorean theorem (Rise^2 + run^2 = Stringer Length^2) is used to calculate the hypotenuses or the lengths of the stringers. The top step in figure 46 is attached to the floor frame. To determine the length of the stringer, use the desired unit rise of 175 mm and unit run of 250 mm. The stairs have 12 risers and 12 treads. The rise used in the Pythagorean theorem to calculate the stringer length will be 175 mm times 12 = 2100 mm (the true total rise). The run used is 250 mm times 12 = 3000 mm. The square root of 2100 mm squared plus 3000 mm squared =  3662 mm.  3662 mm is the length of the stringer.

Figure 46  The Top Step Is Attached To The Floor Frame

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1.Stairs: Calculate The Unit Rise & Unit Run Of Stairs.
2.Stairs: Calculate Stairwell Openings.
3.Stairs: Layout A Stringer When The Floor Frame Is The Top Step.
4.Stairs: Layout A Stringer When The Top Step Is Attached To The Floor Frame.
5.Stairs: Layout The Rise & Run Along The Stringer.

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Ronald Hunter

All images and text are copyright Ronald Hunter 2005 to 2011