General Requirements - Stairs
Introduction
The rules covering stairways depend on how and when the stairs are used. For example, there are requirements for stairways used during construction and stairs used temporarily during construction (1926.1052).
Angles for stairs, ramps, and ladders.
Stairways Used During Construction
The following requirements apply to all stairways used during construction (1926.1052(a)):
- Stairways that will not be a permanent part of the structure on which construction work is performed must have landings at least 30 inches deep and 22 inches wide (76 x 56 cm) at every 12 feet (3.7 m) or less of vertical rise.
- Stairways must be installed at least 30 degrees, and no more than 50 degrees, from the horizontal.
- Variations in riser height or stair tread depth must not exceed 1/4 inch in any stairway system, including any foundation structure used as one or more treads of the stairs.
- Where doors or gates open directly onto a stairway, a platform must be provided that is at least 20 inches (51 cm) in width beyond the swing of the door.
- Metal pan landings and metal pan treads must be secured in place before filling.
- All stairway parts must be free of dangerous projections such as protruding nails.
- Slippery conditions on stairways must be corrected.
- Workers may not use spiral stairways that will not be a permanent part of the structure.
Knowledge Check Choose the best answer for the question.
3-1. Stairways used during construction must be installed at least _____, and no more than _____, from the horizontal.
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