Fixed ladders with safety cages

What it is

A fixed ladder is a permanently attached vertical or near-vertical ladder giving access to roofs, tanks, silos, equipment, crane runways and elevated platforms where a stair is impractical. It consists of two stiles (side rails), rungs at uniform spacing, wall brackets or stand-offs, and – depending on height and market – a safety cage, a ladder safety system (rigid rail or cable with a sliding fall arrester), rest platforms and a protected top exit through the guardrail.

Fixed ladders are the most code-sensitive item in a misc. metals package because fall-protection rules have changed in recent years and differ between markets. World Steel details each ladder to the code nominated by the client and coordinates it with the platform, guardrail openings and building cladding in the same Tekla model.

Types and options

Stiles are typically flat bar or channel; rungs are solid round or square bar with a serrated or knurled top for grip. The top of the ladder is finished with extended stiles or grab handles and a self-closing gate in the platform guardrail.

Design and compliance

United States. OSHA 29 CFR 1910.23 requires rungs spaced 10–14 in (255–355 mm) apart and uniform, a clear width between side rails of at least 16 in (405 mm), at least 7 in (180 mm) clearance behind the ladder, side rails that extend at least 42 in (1,070 mm) above the access level, and a ladder that supports two loads of 250 lb. Under 1910.28(b)(9), fixed ladders extending more than 24 ft (7.3 m) need a personal fall arrest or ladder safety system; such ladders installed on or after 19 November 2018 must have one, and cages and wells are no longer accepted as fall protection after 18 November 2036. For new tall ladders in US facilities, World Steel therefore recommends brackets for a ladder safety system rather than a cage alone.

Australia. AS 1657-2018 sets rung spacing at 250–300 mm and covers ladder angle, width, cages, fall-arrest devices and landings; the designer selects the fall-protection method under the WHS risk-management process. See Australian standards.

Europe. EN ISO 14122-4 requires uniform rung spacing of 225–300 mm, a clear width between stiles of 400–600 mm and fall protection – a safety cage or fall arrester – where the climbing height exceeds 3 m. It applies to machinery under the Machinery Directive 2006/42/EC, replaced by the Machinery Regulation (EU) 2023/1230 from January 2027. See European standards.

Ladder safety systems (rails, cables and arresters) are proprietary tested products. World Steel fabricates the ladder and mounting brackets to the system supplier's details; the system itself is supplied and installed per its manufacturer's instructions.

Fabrication and finishing at World Steel

Rung holes are CNC drilled or punched in the stiles so spacing is exact, and rungs are inserted and welded all round to AWS D1.1, AS/NZS 1554.1 or EN ISO 3834-2 procedures. Cage hoops are rolled to a constant radius and welded to the vertical straps on jigs. Ladders are made in transportable lengths with bolted splice plates, and every item is marked to the erection drawing.

The standard finish is hot-dip galvanizing by qualified galvanizers to ASTM A123, AS/NZS 4680 or EN ISO 1461, with vent holes designed into the stiles and hoops; a duplex safety-yellow topcoat is available. Cages and ladders are nested in frames to avoid distortion during container shipping.

Installation and specifying

• Fix brackets at the spacing shown on the shop drawings; check plumb and the clearance behind the rungs.
• Install the ladder safety system and test it according to the supplier's instructions before use.
• Confirm the top exit and self-closing gate align with the platform guardrail.
• Specify the code, climb height, fall-protection method, supporting structure and finish.

Where the climb is frequent or tools must be carried, consider a ship ladder or a steel stair instead – they are safer and faster to use.