29. The general rule (in the US) is 7-11 (a 7 inch rise and 11 inch run) (17.78cm-27.94cm). More exactly, no more than 7 3/4 inches (19.7cm) for the riser (vertical) and a minimum of 10 inches (25.4cm) for the tread (horizontal or step). You can find some more information here as well on other stair-related dimensions.. The porch also has 9 linear feet of 6″ step. So enter in the footing calculator, 6″ depth by 12″ width (always figure steps with a 12″ width) by 9′ length. This totals .17 cubic yards. The total concrete needed for the 3′ by 3′ porch will be .28 cubic yards. (.11 + .17 cubic yards = .28 cubic yards)
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With the tape measure, measure the vertical distance of one of the stairs: from the top of one tread to the top of the tread above it. The distance should be no more than 7-3/4 inches. This vertical span is the stair riser. A stair riser is the back, vertical part of a step. Staircase riser height translates to the distance you move your foot.. Minimum distance between two stair railings. 27 inches. Distance between the two stair railings as measured from the two closest edges. Minimum single stair railing distance. 31-1/2 inches. Distance between a single stair railing and the opposite wall (with no stair railing) Guard railing minimum height. 36 inches.
