Roof Access Stair Requirements

Each step or rung of a fixed ladder must be able to.

Roof access stair requirements.

When a roof access hatch or scuttle is located within 10 feet 3 0 m of a roof edge a guard shall be installed in accordance with imc section 304 11. When unavoidable obstructions are encountered the minimum clearance at the obstruction may be reduced to 24 inches 61 cm provided deflector plates are installed see figure d 5 of this section. A minimum perpendicular distance of 30 inches 76 cm from the centerline of the steps or rungs to the nearest object on the climbing side. Interior stairs shall terminate at the under side of the roof at a hatch or scuttle of at least 8 square feet 0 74 m 2 with a minimum dimension of 20 inches 508 mm.

Access to setback roof areas may be through a door or window opening to the roof. Individual rung step ladders must extend at least 42 inches 1 1 m above an access level or landing platform either by. Spiral stairs must meet the vertical clearance requirements in paragraph d 3 of this section. Fixed ladders must be able to support at least two loads of 250 pounds 114 kg each concentrated between any two.

Free egress from the roof to the stairwell is required for occupied roofs but is not mandated by the ibc or nfpa 101 for unoccupied roofs. 1910 25 b 3 stairs have uniform riser heights and tread depths between landings.