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If your cozy little nest is not big enough to accommodate a double spiral staircase that allows two people at the same time, one that goes up and one that goes down, never to cross, do not despair... All the world can not live in Chambord Castle! But if the steps of your staircase respect certain rules you will use it with complete peace of mind.

The step is the useful width of the staircase

The step is the name specifically given to the length of the steps that is to say, the width of the stairs.
The step is measured differently depending on the configuration of the stairs:

  • It is the width between the two silts or the walls of embossings (the walls between which is the staircase)
  • This is the width between the silt and the wall of eclipse.
  • If the staircase has a handrail and if the latter encroaches more than 10 cm on the steps, the step is measured in line with the handrail.

The larger the footprint, the easier it will be for you to cross the stairs or carry bulky items with it. In a particular house, it is recommended to provide a width of at least 80 cm.

The stride line, a theoretical and very useful line

This useful width makes it possible to determine the stride line. It is the imaginary line that naturally follows a person going up or down a staircase.

  • For a staircase less than 1 m wide, the stride line is in the middle of the flight.
  • For a staircase greater than 1 m wide, the stride line is 50 cm from the railing.

It is strongly recommended that it is at least 25 cm from the wall or the handrail and that the step is at least 50 cm wide.

Choosing the right way up your stairs

Between standards and the reality of the place you have, sometimes you have to adapt the stairs. For example, it is perfectly acceptable for a service staircase or secondary staircase to be narrower than the main staircase of your house.
If on the other hand your staircase is between two walls plan a step of at least 80 cm. Too narrow, it can give an unpleasant impression of confinement and the day you have to move furniture, you will appreciate having enough room.
But in a small space, stairs gaining space at steps of 50 cm wide are welcome. Most often they are spiral staircases or ladders like miller or not Japanese.

In summary, to be comfortable to use, the steps of a staircase must be at least 50 cm wide. The ideal average is 80 to 90 cm, which allows to cross without interference. Of course if the stairs are wider (1 m and more), it is only better.

Did you know? The famous twin or double-spiral staircase of Chambord Castle is attributed to Leonardo da Vinci. It would have been made based on his drawings. But nothing is less certain... Its peculiarity is that a person who goes up never crosses the one who goes down. It's actually two stairs in one. The European Parliament of Strasbourg has a staircase of the same type.

To read on the same subject:

  • The stair nosing of a staircase
  • Build a staircase
  • Renovate a staircase