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Unit 63

Unit 63. Types of Stairways. Basic Stairway Arrangements • Stairway Components. Interior stairways lead to upper or lower levels within a building. Exterior stairways lead to entrances or decks. Stairway arrangements are based on room design. Stairways may be enclosed by walls or railings.

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Unit 63

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  1. Unit 63 Types of Stairways Basic Stairway Arrangements • Stairway Components

  2. Interior stairways lead to upper or lower levels within a building.

  3. Exterior stairways lead to entrances or decks.

  4. Stairway arrangements are based on room design.

  5. Stairways may be enclosed by walls or railings.

  6. A stairway is composed of many components. Main stairways are commonly outfitted with balusters and newel posts.

  7. A stringer provides the main support for a stairway. Treads and risers are fastened to the stringers.

  8. Four types of stringers are cleated, dadoed, cut-out, and housed. Cleated or dadoed stringers are used for stairways to basements and other uninhabited areas of a building. Cut-out or housed stringers are usually used for other stairways.

  9. The total rise of a stairway is its total height and the total run is its length. The unit rise is the riser height and the unit run is the tread depth.

  10. Preferred angles for stairs fall between 30° and 35°.

  11. Riser height is calculated first, followed by tread depth calculations. In this example, the total rise of the residential stairway is 8′-11″ and the total run is 12′-4 3/4″.

  12. Square gauges are positioned on a framing square to ensure accurate tread and riser measurements. In this example for a residential stairway, the risers are 7 1/4″ high and the treads are 10 1/2″ deep. The stairway has seven treads and eight risers.

  13. When dropping the stringer, all riser heights will be equal when a finish floor is placed.

  14. Stringers must be securely fastened at the top and bottom since the stringers carry the main load of the stairway.

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