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Unit 64

Unit 64. Stairway Construction. Constructing Interior Stairways • Installing Prefabricated Stairways • Constructing Exterior Stairways. The minimum clear stairway width above handrails is 36″. The clear width at and below the handrail depends on the number of handrails installed.

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Unit 64

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  1. Unit 64 Stairway Construction Constructing Interior Stairways • Installing Prefabricated Stairways • Constructing Exterior Stairways

  2. The minimum clear stairway width above handrails is 36″. The clear width at and below the handrail depends on the number of handrails installed.

  3. Headroom is the minimum vertical clearance required and is measured from a line connecting the nosings on the stairway to any part of the ceiling above the stairway.

  4. The minimum headroom must be maintained between parallel flights of stairs.

  5. The maximum riser height for residential stairways is 7 3/4″ and the maximum tread depth is 10″.

  6. The minimum tread depth at the line of travel is 10″. The narrowest portion of the tread should not be less than 6″ wide.

  7. Tread nosings are not permitted to have a radius larger than 9/16″. Beveled nosings cannot be greater than 1/2″ × 1/2″.

  8. Landings must be as wide as the stairway they serve and must be at least 36″ wide.

  9. The top of a handrail must be 34″ to 38″ above the tread nosings.

  10. Type I or II handrails are required for residential stairways.

  11. Minimum and maximum dimensions for commercial stairways are different than those for residential stairways.

  12. The length of a stairwell opening must be properly calculated to ensure the proper amount of headroom.

  13. A straight‑flight stairway runs directly between different floor levels.

  14. When constructing an L‑shaped residential stairway with a landing, the landing is built first. Stringers from the first floor to the landing, and from the landing to the second floor, are then installed.

  15. Winders are installed when space does not allow a straight‑flight stairway with a landing.

  16. The line of travel for a stairway with winders is 12″. Whenever possible, the depth of a winder tread at the line of travel should be the same as the tread depth along the straight-flight section.

  17. Before a stairway is installed, the winder section is laid out to full scale in the floor area where the stairway is to be installed. In this example, the line of travel is 14″. The tread depth along the winder and straight‑flight line of travel will be 10″. The total width of the stairway is 36″.

  18. Grooves in a housed stringer are made with a router.

  19. When assembling a stairway with housed stringers, the risers and treads are placed in the grooves and secured with glue and wedges. Glue blocks fasten the bottoms of the risers to the edges of the treads.

  20. In a mitered stringer, the corner joints of the risers and the stringer are mitered.

  21. An exterior stairway may be constructed of wood or may be finished with nonwood materials.

  22. The steps of an exterior stairway may be finished with enclosed treads and risers or the risers may remain open.

  23. Stairways must be properly supported. The stairway in this example is supported by a concrete step at the bottom, concrete piers, and a 2 × 6 header at the top.

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