STAIRS AND STAIR FRAMING
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Transcript of STAIRS AND STAIR FRAMING
STAIRS AND STAIR FRAMING` Prepared by
Ricardo Brown
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.
Lesson Objectives
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.
STAIRS
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
Stair Terminology
Rough Opening The rough opening for
the stairwell must be carefully laid out and constructed
Trimmers and headers should be doubled for support
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.
Designing Stairs
Questions