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2-17. Stair Design

Use the following rules when designing stairways:

Rule 1. The sum of 2 risers and 1 tread should equal 25 inches.

Rule 2. The sum of 1 riser and 1 tread should equal 17 to 19 inches.

Rule 3. The height of the riser, multiplied by the width of the tread, should equal approximately 75 inches. According to rule 1, a riser of 7 1/2 inches would require a tread of 10 inches. A 6 1/2-inch riser would require a 12-inch tread.

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