Today saw the 2013 residential design specifications. 3.8.4 The width of the staircase should not be less than 0.22m, the height should not be greater than 0.20m, fan-shaped stepping angle from the handrail 0.25m, the width should not be less than 0.22m.
For the fan-shaped step angle from the handrail edge 0.25m, the width should not be less than 0.22m. I can not understand what kind of concept, it is best to mark out to show me thank you
Fan-shaped staircase when the small outside, the provisions of the specification, simply said that the minimum width is not less than 220mm, it is so simple.
that is, "people can use part of the width to ensure that 220 can"
However, this fan from the edge of the handrail 250, is the most part of the distance from the radial distance of 250mm, where the step width of not less than 220 only,
