Rules applying to all stairways

• In any stairway there should not be more than 36 rises in consecutive flights, unless there is a change in the direction of at least 30°.

• For any step the sum of twice its rise plus going (2R + G) should not be more than 700 mm or less than 550 mm. This rule is subject to variation at tapered steps, for which there are special rules.

• The rise of any step should generally be constant throughout its length and all steps in a flight should have the same rise and going.

• Open risers are permitted in a stairway but for safety the treads should overlap each other by at least 16 mm and the space between be not more than 100 mm.

• Each tread in a stairway should be level.

250 260 going (mm)

Figure 10.1e General requirements under Section K: Practical limits (rise and going) - private stairways

Figure 10.1f General requirements under Section K: Practical limits (rise and going) - institutional and assembly buildings
0 0

Post a comment