08/13/2026
𝐔𝐧𝐝𝐞𝐫𝐬𝐭𝐚𝐧𝐝𝐢𝐧𝐠 𝐒𝐭𝐚𝐢𝐫𝐬, 𝐒𝐡𝐢𝐩𝐬 𝐋𝐚𝐝𝐝𝐞𝐫𝐬, 𝐚𝐧𝐝 𝐒𝐭𝐫𝐚𝐢𝐠𝐡𝐭 𝐋𝐚𝐝𝐝𝐞𝐫𝐬 𝐖𝐡𝐞𝐧 𝐔𝐬𝐞𝐝 𝐨𝐧 𝐂𝐡𝐚𝐥𝐥𝐞𝐧𝐠𝐞 𝐂𝐨𝐮𝐫𝐬𝐞𝐬 𝐚𝐧𝐝 𝐂𝐥𝐢𝐦𝐛𝐢𝐧𝐠 𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞𝐬
As the aerial adventure and challenge course industry continues to mature, the physical infrastructure supporting our programs must mature alongside it. During our third-party inspections across the country, our teams at Experiential Systems, Inc. (ESI) repeatedly encounter a critical, recurring compliance issue: the improper use of straight ladders and ships ladders for participant access on climbing towers and elevated platforms.
Often, facilities rely on vertical straight ladders spanning 10 to 12 feet between internal tower levels, or they install steep ships ladders lacking proper side handrails.
The legality and safety of these structures come down to one critical distinction: Is the ladder an unbelayed access route, or is it a belayed challenge course element?
If you operate a climbing structure, ropes course, or aerial park, here is the definitive guide to understanding what is allowable, what is non-compliant, and how to properly protect your participants and your organization.
𝐓𝐡𝐞 𝐆𝐨𝐥𝐝𝐞𝐧 𝐑𝐮𝐥𝐞: 𝐔𝐧𝐛𝐞𝐥𝐚𝐲𝐞𝐝 𝐀𝐜𝐜𝐞𝐬𝐬 𝐯𝐬. 𝐁𝐞𝐥𝐚𝐲𝐞𝐝 𝐄𝐥𝐞𝐦𝐞𝐧𝐭𝐬
The most common mistake builders and operators make is applying OSHA (Occupational Safety and Health Administration) employee standards to public participants utilizing an unbelayed walking surface.
𝐔𝐧𝐛𝐞𝐥𝐚𝐲𝐞𝐝 𝐀𝐜𝐜𝐞𝐬𝐬 (𝐆𝐨𝐯𝐞𝐫𝐧𝐞𝐝 𝐛𝐲 𝐈𝐁𝐂/𝐔𝐁𝐂): If a participant is walking up to a platform or transitioning between levels of a climbing tower without being actively clipped into a life-safety fall protection system, that route is considered public access/egress. This falls under the jurisdiction of the International Building Code (IBC) and local building codes. Under these codes, vertical ladders and ships ladders are strictly prohibited as a primary means of public access.
𝐒𝐭𝐚𝐟𝐟 𝐔𝐬𝐞 (𝐆𝐨𝐯𝐞𝐫𝐧𝐞𝐝 𝐛𝐲 𝐎𝐒𝐇𝐀): OSHA allows vertical ladders and ships ladders for authorized personnel (employees, inspectors, maintenance) because staff members are trained, capable, and utilizing proper PPE or ladder safety systems.
𝐓𝐡𝐞 𝐂𝐫𝐢𝐭𝐢𝐜𝐚𝐥 𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧: 𝐖𝐡𝐞𝐧 𝐚 𝐋𝐚𝐝𝐝𝐞𝐫 𝐁𝐞𝐜𝐨𝐦𝐞𝐬 𝐚𝐧 "𝐄𝐥𝐞𝐦𝐞𝐧𝐭"
There is a fully compliant way to utilize straight ladders and ships ladders for the general public: The ladder must be treated as a challenge course element rather than a standard access route.
If participants are using a vertical or ships ladder to ascend a tower, they must be actively protected by a personal fall protection system that limits their maximum free fall to no more than 2 feet. If a participant can clip in on the ground and is protected against a fall the entire way up, the ladder is compliant as a belayed activity.
If your facility currently uses straight or ships ladders, there are several highly effective ways to retrofit them with compliant fall protection systems:
𝐒𝐞𝐥𝐟-𝐑𝐞𝐭𝐫𝐚𝐜𝐭𝐢𝐧𝐠 𝐋𝐢𝐟𝐞𝐥𝐢𝐧𝐞𝐬 (𝐒𝐑𝐋𝐬) Mounted overhead, an SRL keeps constant tension on the climber and arrests a fall almost instantly.
𝐕𝐞𝐫𝐭𝐢𝐜𝐚𝐥 𝐂𝐚𝐛𝐥𝐞 𝐆𝐫𝐚𝐛𝐬 𝐨𝐫 𝐑𝐨𝐩𝐞 𝐆𝐫𝐚𝐛𝐬: Participants wear a harness attached to a grab device that glides up a vertical lifeline as they climb but locks instantly in the event of a downward slip.
𝐂𝐨𝐧𝐭𝐢𝐧𝐮𝐨𝐮𝐬 𝐁𝐞𝐥𝐚𝐲 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 𝐰𝐢𝐭𝐡 𝐀𝐧𝐭𝐢-𝐑𝐨𝐥𝐥𝐛𝐚𝐜𝐤 𝐃𝐞𝐯𝐢𝐜𝐞𝐬: On angled ships ladders or stepped inclines, specialized continuous belay hardware can be installed that allows forward movement but mechanically blocks the participant from rolling backward if they lose their footing.
𝐀 𝐂𝐫𝐮𝐜𝐢𝐚𝐥 𝐃𝐢𝐬𝐭𝐢𝐧𝐜𝐭𝐢𝐨𝐧 𝐨𝐧 𝐇𝐚𝐫𝐧𝐞𝐬𝐬𝐞𝐬: To eliminate any confusion when implementing these fall protection systems, there is a strict legal distinction between what a participant can wear and what a staff member must wear. While participants may wear standard recreational climbing harnesses appropriate for the element, staff members are required to follow OSHA codes. If an employee is utilizing a personal fall arrest system to climb a ladder on the job, they must be wearing an OSHA-compliant full-body harness.
𝐒𝐭𝐫𝐚𝐢𝐠𝐡𝐭 𝐋𝐚𝐝𝐝𝐞𝐫𝐬 (𝐕𝐞𝐫𝐭𝐢𝐜𝐚𝐥 𝐋𝐚𝐝𝐝𝐞𝐫𝐬)
We frequently see straight, vertical ladders installed inside the "chimney" or internal framing of a climbing tower.
𝑭𝒐𝒓 𝑷𝒂𝒓𝒕𝒊𝒄𝒊𝒑𝒂𝒏𝒕𝒔: Allowable only if they are wearing an appropriate harness and are attached to a 2-foot fall protection system (SRL, cable grab, etc.) before they leave the ground.
𝑭𝒐𝒓 𝑺𝒕𝒂𝒇𝒇: Allowable under OSHA, provided employees use appropriate ladder safety systems or personal fall arrest systems (which strictly require an OSHA-compliant full-body harness) depending on the height.
Compliance Action: If your vertical ladder does not have a fall protection system, it must be completely restricted from public use. You must install clear, permanent signage reading "Authorized Personnel Only" or physically secure the ladder behind a locked hatch or gate.
𝐒𝐡𝐢𝐩𝐬 𝐋𝐚𝐝𝐝𝐞𝐫𝐬
A ships ladder is a set of stairs with an unusually steep pitch (typically between 50 and 70 degrees).
𝑭𝒐𝒓 𝑷𝒂𝒓𝒕𝒊𝒄𝒊𝒑𝒂𝒏𝒕𝒔: Allowable only if treated as a belayed element with an active fall protection system (like an anti-rollback continuous belay). Without fall protection, the steep incline presents a massive fall risk and violates public building codes.
𝑭𝒐𝒓 𝑺𝒕𝒂𝒇𝒇: Allowable under OSHA for employees, provided they meet strict design criteria. ESI inspectors frequently find ships ladders installed without proper side handrails. To be OSHA-compliant for staff use, a ships ladder must have handrails on both sides, allowing the employee to maintain three points of contact.
𝑪𝒐𝒎𝒑𝒍𝒊𝒂𝒏𝒄𝒆 𝑨𝒄𝒕𝒊𝒐𝒏: Unbelayed ships ladders must be restricted from participant use, clearly signed for staff only, and retrofitted with continuous handrails.
𝐒𝐭𝐚𝐧𝐝𝐚𝐫𝐝 𝐒𝐭𝐚𝐢𝐫𝐬: 𝐓𝐡𝐞 𝐑𝐞𝐪𝐮𝐢𝐫𝐞𝐝 𝐏𝐚𝐭𝐡 𝐟𝐨𝐫 𝐔𝐧𝐛𝐞𝐥𝐚𝐲𝐞𝐝 𝐏𝐚𝐫𝐭𝐢𝐜𝐢𝐩𝐚𝐧𝐭𝐬
If the general public is navigating your structure without being actively on a belay system, they must use code-compliant standard stairs.
𝐓𝐨 𝐦𝐞𝐞𝐭 𝐬𝐭𝐚𝐧𝐝𝐚𝐫𝐝 𝐈𝐁𝐂 𝐚𝐧𝐝 𝐀𝐒𝐓𝐌 𝐅𝟐𝟗𝟓𝟗/𝐅𝟐𝟐𝟗𝟏 𝐫𝐞𝐪𝐮𝐢𝐫𝐞𝐦𝐞𝐧𝐭𝐬, 𝐲𝐨𝐮𝐫 𝐬𝐭𝐚𝐢𝐫𝐜𝐚𝐬𝐞𝐬 𝐦𝐮𝐬𝐭 𝐟𝐞𝐚𝐭𝐮𝐫𝐞 𝐭𝐡𝐞 𝐟𝐨𝐥𝐥𝐨𝐰𝐢𝐧𝐠:
𝑷𝒓𝒐𝒑𝒆𝒓 𝑹𝒊𝒔𝒆 𝒂𝒏𝒅 𝑹𝒖𝒏: Stairs must be built to standard architectural pitch (typically a maximum 7-inch riser and minimum 11-inch tread depth, though local Authority Having Jurisdiction (AHJ) codes can vary slightly for outdoor recreation structures).
𝑻𝒆𝒙𝒕𝒖𝒓𝒆-𝑪𝒐𝒂𝒕𝒆𝒅 𝑻𝒓𝒆𝒂𝒅𝒔: Wood gets slick, especially outdoors. All stair treads should be texture-coated or fitted with heavy-duty, slip-resistant grip tape/tread plates to prevent slips during wet weather.
𝑯𝒂𝒏𝒅𝒓𝒂𝒊𝒍𝒔: Must be provided for stability while walking up the stairs (typically positioned 34 to 38 inches above the tread nosing).
𝑮𝒖𝒂𝒓𝒅𝒓𝒂𝒊𝒍𝒔: Open-sided walking surfaces and platforms elevated more than 30 inches above the ground must have guardrails at least 42 inches high. The infill (balusters or netting) must be spaced so that a 4-inch sphere cannot pass through.
𝐄𝐥𝐞𝐯𝐚𝐭𝐢𝐧𝐠 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐲 𝐒𝐭𝐚𝐧𝐝𝐚𝐫𝐝𝐬
At Experiential Systems, Inc., our goal as an ISO 9001:2015 Certified company is to engineer risk out of the equation where possible. Assuming that a challenging environment excuses a lack of basic architectural safety is a dangerous mindset. Climbing towers and ropes courses should challenge a participant's physical limits on the belayed elements—not on the walk up to the starting deck.
If your facility is currently utilizing unbelayed ships ladders or vertical ladders for participant access, it is time to plan a retrofit. Contact our professional team today to discuss adding appropriate fall protection systems or designing code-compliant staircases that protect your participants from falls, and protect your organization from liability.
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