ESCALERAS NORMA OHSAS 1910.24

"Angle of stairway rise." Fixed stairs shall be installed at angles to the horizontal of between 30 deg. and 50 deg. Any uniform combination of rise/tread dimensions may be used that will result in a stairway at an angle to the horizontal within the permissible range. Table D-1 gives rise/tread dimensions which will produce a stairway within the permissible range, stating the angle to the horizontal produced by each combination. However, the rise/tread combinations are not limited to those given in Table D-1.

Table D-1

Angulo a Horizontal

Contra Huella (Rise) Huella (Tread Run)Pulgadas Centimetros Pulgadas Centimetros

30° 35´ 6 ½ 16.51 11 27.9432° 08´ 6 ¾ 17.14 10 ¾ 27.3033° 41´ 7 17.78 10 ½ 26.6735° 16´ 7 ¼ 18.41 10 ¼ 26.0336° 52´ 7 ½ 19.05 10 25.4038° 29´ 7 ¾ 19.68 9 ¾ 24.7640° 08´ 8 20.32 9 ½ 24.1341° 44´ 8 ¼ 20.95 9 ¼ 23.4943° 22´ 8 ½ 21.59 9 22.8645° 00´ 8 ¾ 22.22 8 ¾ 22.2246° 38´ 9 22.86 8 ½ 21.5948° 16´ 9 ¼ 23.49 8 ¼ 20.9549° 54´ 9 ½ 24.13 8 20.32

Rise

Tread Run

NORMA ESPAÑOLA NTP 404: ESCALERAS FIJAS