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Unit 64Unit 64Stairway ConstructionStairway Construction

Constructing Interior Stairways • Installing Prefabricated Stairways •

Constructing Exterior Stairways

Constructing Interior Stairways • Installing Prefabricated Stairways •

Constructing Exterior Stairways

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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.

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.

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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.

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.

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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.

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.

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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″.

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″.

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

Grooves in a housed stringer are made with a router.

Grooves in a housed stringer are made with a router.

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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.

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.

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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

Unit 64 — Stairway ConstructionUnit 64 — Stairway Construction

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.

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.