Scala Componenti e terminologia
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Module 13: Stair Construction

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Scala Componenti e terminologia

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Stairway Components
The main components of a flight of stairs are treads, risers, and stringers.
• Tread – The horizontal surface of a step.

• Riser – A piece forming the vertical face of the step. Commercial stair codes sometimes require a riser piece. Other stair codes may allow the omission of the riser piece (open riser).

• Cutout Stringer – A cutout stringer provides the main support for a stairway. Center cutout stringers may be required.

Other types of stringers used as an aside support for stairs are the cleated, dadoes, or housed stringers.

A cleated stringer is a stringer with cleats fastened to it to support the treads. A similar design is a dadoes stringer, where the treads fit into a slot cut in the stringer.

Both of these designs are normally used for open riser stairs.

Other types of stringers used as an aside support for stairs are the cleated, dadoes, or housed stringers.

A cleated stringer is a stringer with cleats fastened to it to support the treads. A similar design is a dadoes stringer, where the treads fit into a slot cut in the stringer.

Both of these designs are normally used for open riser stairs.

Interior Stairways - Terminology
The terminology used for other components of most interior stairways is described below. Click on the buttons to find out more:

Gooseneck
A gooseneck is a bent or curved section in the handrail or guardrail.

Handrail
A handrail is used for support when ascending or descending a stairway. It may be mounted on the walls or on a guardrail for open stairways.

Headroom clearance
Headroom clearance is the distance between any portion of a step of the stairways and any overhead structure such as ceiling.

Landing
A landing (platform) is a flat section that breaks the stairway into two sections between floors. It must be used when the vertical distance (between floors) from the top of the stairway to the bottom exceeds 12’, or as specified by code. A platform must be as a wide and as a deep as the stairways width for each section of the stair abutting it.

Nosing
Nosing is the projection of the tread beyond the face of the riser.

Nosing Return
On stairways with an open stringer, a nosing return (end nosing) is the projection over the face of the tread at the end of the tread.

Spindle
A spindle or baluster is the upright piece that runs between the handrail or guardrail and the tread or a closed stringer. The balusters, handrail or guardrail, and newel posts make up the balustrade.

Skirt Board
A skirt board (finished stringer) is a finished board nailed against the wall side of a stairway. The top of the board is parallel to the slope of the stairway and the ends terminate horizontal with the wall base molding. A housed stringer supporting the tread may be used instead of the skirt board.

Open Finished Stringer
An open finished stringer is a finished piece cut to match the stair stringer supporting the stair treads.

Closed Finished Stringer
A closed finished stringer is a finished piece fastened to the stair stringer. A housed stringer supporting the tread may be used instead of the closed stringer.

Starting Newel Post
A starting newel post is the main post supporting a handrail or guardrail at the bottom of the stairways.

Landing Newel Post
A landing newel post is the main post supporting the handrail (guardrail) at the landing.

Ending Newel Post
The ending newel post, if used, is the uppermost supporting post for the handrail, or guardrail. Sometimes no newel post or only half of a newel post is used.



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