NOTE ON STAIRWAYS The rule in SANS 10400 M of a minimum going of 250 mm and a maximum rise of 200 mm often leads to a – disregard for two other dimension of each step of the stairway shall be such that the sum of rules, i.e, “the the going and twice the riser is not less than 570 mm and not more than 650 mm”, and stairway shall “any … have dimensions appropriate to its use” part M Stairways). A maximum rise of 180 and a minimum (NBR going of 280 is a more comfortable and safer proportion, and should be used in most public buildings. The full range of a more comfortable and safer proportion would be (rise/going): 180/280 mm; 170/280 320 mm; 150/280 350 mm; 120/280 – –
NOTE ON STAIRWAYS The rule in SANS 10400 – M of a minimum going of 250 mm and a maximum rise of 200 mm often leads to a disregard for two other rules, i.e, “the dimension of each step of the stairway shall be such that the sum of the going and twice the riser is not less than 570 mm and not more than 650 mm”, and “any stairway … shall have dimensions appropriate to its use” (NBR part M Stairways). A maximum rise of 180 and a minimum going of 280 is a more comfortable and safer proportion, and should be used in most public buildings. The full range of a more comfortable and safer proportion would be (rise/going): 180/280 mm; 170/280 – 320 mm; 150/280 – 350 mm; 120/280
PW371-B%20Particular%20Specification%20edition%202.0%20July2013.docx