Residential stairs are required to have a minimum width of no less than 36 inches and should have stringers every 16-18 inches. Stairways of 36 inches will need at least three stringers. Stairways wider than 36 inches will need at least four stringers.
How Many Stair Stringers Do I Need?
When it comes to building stairs, one of the most important questions to answer is “how many stair stringers do I need?” Determining the number of stringers is not a straightforward task, as it depends on the number of risers, the width of the stair, the span of the stair, the type of stair, and the load on the stair.
The number of stair stringers required depends on the number of risers on the stair. Generally, one stringer is used with between 4 and 8 risers, two stringers are used with between 9 and 14 risers, and three stringers are used with 15 or more risers.
The width of the stair is also an important factor in determining the number of stringers. Generally, one stringer is used with a width of up to 36 inches, two stringers are used with a width of between 37 and 48 inches, and three stringers are used with a width of more than 48 inches.
The span of the stair is also a factor in determining the number of stringers. Generally, one stringer is used for up to 8 feet, two stringers are used for between 8 and 10
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