3STAIRSSTAIR – 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
4STAIRSTypes of StairsMain StairsStraight Run, Platform, and WindingService StairsStairways are usually not built or installed until after interior wall surfaces are complete and finish flooring has been laid.
5Stair TerminologyStairwell – the rough opening in the floor above to provide headroom for stairsStringer – one of the inclined sides of a stair that supports the risers and treadsRiser – the vertical surface between two treadsTread – the horizontal face of one step
6Stair TerminologyNosing – the part of the tread that extends over the riser beneath itNewel – the post that supports the railingHandrail – an angled piece supported by a wall or railing intended to be grasped by personsBalusters – vertical members supporting the handrail on open stairs
7Stair TerminologyPlatform – a horizontal area placed between to flights of stairsLanding – the floor at the top or bottom of each story where a flight of stairs begins or endsWinders – Wedge-shaped treads installed where stairs turnUnit Run – the width of a tread minus the nosing
8Stair TerminologyUnit Rise – the height or a riser; vertical distance between two treadsTotal Run – the sum of all unit runsTotal Rise – the sum of all unit risesHeadroom – the vertical distance from a step to a ceiling above
12Stair Layout Measure total rise (from landing point) Decide on number of risers based on 7” to 7 ½” risers (unless special circumstances prevent this)Divide total rise by # of risers for riser heightSubtract # of risers by 1 for # of treadsSet stair jacks on framing square and trace onto stringerAdd and subtract as needed for top and bottom to adjust for actual floor heights
139’ 2” 9’ 2” = How many inches total rise? 110” What is the standard height of a step?7” to 7 ½”Divide total rise by standard riser height110” / 7” = 15.71110” / 7 ½” = 14.6So… 15 risers and 14 steps110” / 15 = 7.3” = single riser heightAnd standard 11” tread w/ nosing9’ 2”