Interior and basement stairs

The floor-to-floor height, the opening, and the headroom.

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Inside stairs, 8′ 9″ rise: 14 risers of 7-1/2″, 13 treads, 4 stringers (2×12 × 16′) and 11′ 4-1/2″ of floor space.

What people get wrong:

• Measuring the rise before the finish floors. New flooring at the top or bottom makes the first or last step taller or shorter than the rest — measure finished floor to finished floor.
• Forgetting to drop the stringer. The bottom step ends up 3/4″ taller than the rest.
• Headroom checked only at the top step. The tightest spot is under the opening’s edge: measure 6′ 8″ straight up from the nosing line there.

The worked example, every line's math and the code notes · Your own sizes in the app

• Deck and porch stairs: Stringers, landings and outside steps
• Concrete steps: Pouring and facing concrete steps
• Steel and spiral stairs: Steel, spiral and floating stairs
• Railings and guards: Deck, stair and balcony railings: wood, metal and glass
• Every group

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