Cranked slab concrete stair

• Stair may be designed and constructed as a cranked slab spanning through landing , flight and next landing as one slab with no side support . 
• THis is a more costly construction then using the landings as slabs to support the flight . 
• THe flights have a greater span and therefore the cost of the stair is greater . 
• This form of construction is used where the landings cannot gain support each side of the stair .