What is the basis for calculating the tread?
Can be tread surface is the width of more than 220mm place, if the bottom of the concrete bar along the width of the width does not exceed this width, here is not tread surface, from the ground count, if there is bay window, from the caving window count. High railings height of not less than 1100mm
The height of the railing should be calculated from the ground or roof to the vertical height of the top of the railings, such as the bottom of the pedal with a width greater than or equal to 0.22M and a height of less than or equal to 0.45M.
But some of the company's experts are often the trial of the roof of the waterproof wall of the brick; balcony under the fence of the concrete floor; height greater than 0.45M of the windowsill ..... are as 'tread surface' to ask, that is not Conform to the specification.
The width of the railing at the bottom of the balconies, corridors, interior corridors, inner patios, rooftops and outdoor stairs is greater than or equal to 0.22 m and the height is less than or equal to 0.45 m
Step position
