Sets construction criteria for stairways used on construction sites. Temporary stairways (not part of the finished structure) need landings at least 30 inches deep in the direction of travel and at least 22 inches wide at every 12 feet or less of vertical rise. Stairs are set at 30 to 50 degrees from horizontal; riser height and tread depth are uniform within each flight, including any foundation used as a tread, with variation no greater than 1/4 inch across the stairway system. Where a door or gate opens directly onto a stairway a platform is needed and the door swing may not reduce its effective width below 20 inches. Metal pan landings and treads are secured before being filled with concrete or other fill; hazardous projections such as protruding nails are removed; slippery conditions are corrected before the stairs are used. Temporary service: apart from during stairway construction, nobody walks on pan stairs awaiting fill unless the pans are temporarily filled up to their top edge with wood or another solid material (replaced when worn below it), nor on skeleton metal stairs unless secured temporary treads and landings cover the whole tread and landing area. Temporary treads are wood or other solid material across the full width and depth. Stairrails and handrails: any stairway having at least four risers or a rise over 30 inches, whichever is less, needs at least one handrail and a stairrail system on each unprotected side or edge. Winding and spiral stairs need a handrail offset to keep users off treads narrower than 6 inches. Stairrails installed after March 15, 1991 are at least 36 inches high; earlier ones are 30 to 34 inches, measured from the tread at the riser face. Midrails (halfway), screens or mesh, balusters no more than 19 inches apart or other members leaving no gap over 19 inches fill the space under the top rail. Handrails and stairrail top rails withstand 200 pounds downward or outward within 2 inches of the top edge. Handrails are 30 to 37 inches high; a stairrail top edge that doubles as a handrail is 36 to 37 inches. Rails are surfaced against punctures, cuts and snagging, give an adequate handhold, and have ends that are not projection hazards; temporary handrails keep at least 3 inches clearance from walls and other objects. Open sides and edges of landings get guardrail systems built to Subpart M.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.