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Stairs and Stairs Framing…….. | Concrete Civil Engineering

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Stairs and Stairs Framing……..

Stairs

  • Stair- A series of steps, each elevated a measured distance, leading from one level of a structure to another.
  • Flight of Stairs- A continuous series of steps without breaks formed by landings or other constructions.
  • Types of Stairs
  1. Main Stairs
  2. Service Stairs
  • Stairways are usually not built or installed until after interior wall surfaces are complete and finish flooring has been laid.

 

Stair Terminology

  • Stairwell- The rough opening in the floor above to provide headroom for stairs.
  • Stringer- One of the inclined sides of a stair that supports the risers and treads.
  • Riser- The vertical surface between two treads.
  • Tread- The horizontal face of one step.
  • Nosing- The part of the tread that extends over the riser beneath it.
  • Newel- The post that supports the railing.
  • Handrail- An angle piece supported by a wall or railing intended to be grasped by persons.
  • Balusters- Vertical members supporting the handrail on open stairs.
  • Platform- A horizontal area placed between to flights of stairs.
  • Landing- The floor at the top or bottom of each story where a flight of stairs begins or ends.
  • Winders- Wedge-shaped treads installed where stairs turn.
  • Unit Run- The width of a tread minus the nosing.
  • Unit Rise- The height or a riser, vertical distance between two treads.
  • Total Run- The sum of all unit rises.
  • Headroom- The vertical distance from a step to a ceiling above.

 

Rough Opening

  • The rough opening for the stairwell must be carefully laid out and constructed.
  • Trimmers and headers should be doubled for support.

 

Designing Stairs

  • Stairs angle should fall between 30 and 35 degrees.
  • The sum of two risers and one tread should be 24 to 25”.
  • The sum of one riser and on tread should equal 17 to 18”.
  • An 11” run and a 7” rise follows all three rules.

 

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