Staircase - Introduction, Types, Parts and Design

Staircase - Introduction, Types, Parts and Design

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  Rohan Dasgupta Staircase
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  1800 mm 1650 mm Staircaseis a construction designed to bridge a large vertical distance by dividing it into smaller vertical distances, called steps.
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  Types of Staircase:1. STRAIGHT STAIRCASE The straight staircase is the simplest staircase design. There are two types: 1. Straight 2. Straight with landing They’re the easiest type of stairs to ascend and descend as well as build. They’re quite plain and don’t offer a grand design. With respect to footprint, it falls in the middle as to how much footprint it takes up in the home.
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  Types of Staircase:2. QUARTER TURN STAIRCASE The quarter-turn staircase is one where it turns 90° at some point. The “quarter” refers to the degree of turn. This type of staircase is great for certain types of home layouts such as one with a foyer where the door is in from the wall sufficient enough to fit in part of the stairs. It’s more interesting in design than a straight design and the turn means there will almost always be a small landing part way up.
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  Types of Staircase:3. HALF TURN STAIRCASE or DOG LEGGED STAIRCASE The quarter-turn staircase is one where it turns 180° at the mid-landing. The “half” refers to the degree of turn. This is a very popular design because it’s a decent space-saver by doubling up. It’s also a fairly simple style to build. The downside to this is it’s not all that grand of a staircase.
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  Types of Staircase:4. THREE QUARTER TURN STAIRCASE The quarter-turn staircase is one where it turns 90° at each of its 3 landings. The “three quarter” refers to the degree of turn. It is an elaborate design. Quite a bit of space is required to build such a design. It is usually in homes with above-average ceiling height.
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  Types of Staircase:5. CIRCULAR STAIRCASE - top view is circular in shape. - used for taller ceilings.
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  Types of Staircase:6. SPIRAL STAIRCASE - steps are attached radially to a central pole - usually made of metal - used predominantly where vertical height to be covered is much more compared to the horizontal space available. - for eg. in watch towers, storage silos, water tanks etc. - not easy to ascend or descend.
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  Types of Staircase:7. BIFURCATED STAIRCASE - central straight stair gets bifurcated to two straight stairs at 90° at the mid-landing in opposite directions - takes up the most space - luxurious staircase; used mostly for grand entrances
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  Staircase is aconstruction designed to bridge a large vertical distance by dividing it into smaller vertical distances, called steps.
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  Parts of Staircase:
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  Bye-Laws for Staircase: -Minimum tread = 300 mm - Maximum riser = 150 mm - Maximum number of risers per flight = 12 - Minimum headroom = 2.2 m - Minimum width of one stair = 1.5 m - Minimum width of mid-landing >= width of one stair Ref: Clauses 12.4.1. and 12.4.2. of NBC of India 2016 (Vol. 1, Part 3) pg. 44
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  Q. Design anddraw a dog-legged staircase for a floor to floor height of 3.6 m. Floor to floor height = 3600 mm ∴ floor to mid-landing height = 3600/2 mm = 1800 mm Assume height of one riser = 150 mm ∴ total number of risers in one flight of stair = 1800/150 mm = 12 (<= 12; therefore okay) ∴ total number of treads in one flight of stair = (12 - 1) = 11 Assume width of one tread = 300 mm Assume width of one stair = 1500 mm Assume width of mid-landing = 1500 mm
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  Q. Design anddraw a dog-legged staircase for a floor to floor height of 3.0 m. Floor to floor height = 3000 mm ∴ floor to mid-landing height = 3000/2 mm = 1500 mm Assume height of one riser = 150 mm ∴ total number of risers in one flight of stair = 1500/150 mm = 10 (<= 12; therefore okay) ∴ total number of treads in one flight of stair = (10 - 1) = 9 Assume width of one tread = 300 mm Assume width of one stair = 1500 mm Assume width of mid-landing = 1500 mm
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