Stair Terminology

Grating type P (PA / PAD / PAV)

  • When a stair has more than 5 rises handrail should be provided
  • Stairs with more than 16 rises are to be designed with inter-mediate landing platforms
  • For stair widths > 1000mm the intermediate platform length is to be at least the same length as the stair width
  • For general duty stairways slope (HH) is to be between 32° and 38°
  • Tread overlap (B) must be minimum 16m.

 

 

 

 

 

 

 

Slope (HH) 60° 57° 55° 52° 50° 47° 45° 42° 40° 37° 35° 32° 30°
Rise(O) 240 235 230 225 220 215 210 205 200 190 185 175 170
Go (A) 150 160 170 180 190 200 210 220 230 250 260 280 300
Stair tread width (B) 160 170 200 200 200 230 230 230 260 260 300 300 300
Proportion basic length/height (L/H) 0.58 0.65 0.76 0.78 0.84 0.93 1.00 1.11 1.19 1.33 1.43 1.60 1.73