Timber stairs

• A staircase is a stair with treads and risers constructed from timber boards put together as a case. 
• Used where the requirement for fire resistance is minimum . 
• Each flight of a staircase is made up in a joiner's shop as a complete flight of steps , joined to strings . 
• Landing are constructed on site .
• THen , the flight or flights are fixed in position between landings and floors .