Stairs Framing

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Stairs Framing

  1. 2. STAIRS AND STAIR FRAMING
  2. 3. Lesson Objectives <ul><li>Describe what stair construction is. </li></ul><ul><li>Define terms associated with stair construction. </li></ul><ul><li>Calculate the unit rise, unit run, angle of incline, and number of treads for a stairway given the total run and rise. </li></ul>
  3. 4. STAIRS <ul><li>STAIR – a series of steps, each elevated a measured distance, leading from one level of a structure to another. </li></ul><ul><li>“ Flight of Stairs” – a continuous series of steps without breaks formed by landings or other constructions </li></ul>
  4. 5. STAIRS <ul><li>Types of Stairs </li></ul><ul><ul><li>Main Stairs </li></ul></ul><ul><ul><ul><li>Straight Run, Platform, and Winding </li></ul></ul></ul><ul><ul><li>Service Stairs </li></ul></ul><ul><li>Stairways are usually not built or installed until after interior wall surfaces are complete and finish flooring has been laid. </li></ul>
  5. 6. Stair Terminology <ul><li>Stairwell – the rough opening in the floor above to provide headroom for stairs </li></ul><ul><li>Stringer – one of the inclined sides of a stair that supports the risers and treads </li></ul><ul><li>Riser – the vertical surface between two treads </li></ul><ul><li>Tread – the horizontal face of one step </li></ul>
  6. 7. Stair Terminology <ul><li>Nosing – the part of the tread that extends over the riser beneath it </li></ul><ul><li>Newel – the post that supports the railing </li></ul><ul><li>Handrail – an angled piece supported by a wall or railing intended to be grasped by persons </li></ul><ul><li>Balusters – vertical members supporting the handrail on open stairs </li></ul>
  7. 8. Stair Terminology <ul><li>Platform – a horizontal area placed between to flights of stairs </li></ul><ul><li>Landing – the floor at the top or bottom of each story where a flight of stairs begins or ends </li></ul><ul><li>Winders – Wedge-shaped treads installed where stairs turn </li></ul><ul><li>Unit Run – the width of a tread minus the nosing </li></ul>
  8. 9. Stair Terminology <ul><li>Unit Rise – the height or a riser; vertical distance between two treads </li></ul><ul><li>Total Run – the sum of all unit runs </li></ul><ul><li>Total Rise – the sum of all unit rises </li></ul><ul><li>Headroom – the vertical distance from a step to a ceiling above </li></ul>
  9. 10. Rough Opening <ul><li>The rough opening for the stairwell must be carefully laid out and constructed </li></ul><ul><li>Trimmers and headers should be doubled for support </li></ul>
  10. 11. Designing Stairs <ul><li>Stair Angle should fall between 30 and 35 degrees </li></ul><ul><li>The sum of two risers and one tread should be 24 to 25” </li></ul><ul><li>The sum of one riser and on tread should equal 17 to 18” </li></ul><ul><li>An 11” run and a 7” rise follows all three rules. </li></ul>

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