STAIRS AND STAIR FRAMING

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# STAIRS AND STAIR FRAMING - PowerPoint PPT Presentation

STAIRS AND STAIR FRAMING. ` Prepared by Ricardo Brown. Lesson Objectives. Describe what stair construction is. Define terms associated with stair construction. Calculate the unit rise, unit run, angle of incline, and number of treads for a stairway given the total run and rise. STAIRS.

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## STAIRS AND STAIR FRAMING

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### STAIRS AND STAIR FRAMING

` Prepared by

Ricardo Brown

Lesson Objectives
• Describe what stair construction is.
• Define terms associated with stair construction.
• Calculate the unit rise, unit run, angle of incline, and number of treads for a stairway given the total run and rise.
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
STAIRS
• Types of Stairs
• Main Stairs
• Straight Run, Platform, and Winding
• 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
Stair Terminology
• Nosing – the part of the tread that extends over the riser beneath it
• Newel – the post that supports the railing
• Handrail – an angled piece supported by a wall or railing intended to be grasped by persons
• Balusters – vertical members supporting the handrail on open stairs
Stair Terminology
• 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
Stair Terminology
• Unit Rise – the height or a riser; vertical distance between two treads
• Total Run – the sum of all unit runs
• Total Rise – 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
• Stair Angle should fall between 30 and 35 degrees
• The sum of two risers and one tread should be 24 to 25” G+2R =550 – 700mm
• The sum of one riser and on tread should equal 17 to 18”
• An 11” run and a 7” rise follows all three rules.