OSHA Fixed-Anchor and Rope Descent Requirements for Window Cleaning

Why this matters

Rope descent systems (RDS) put a window cleaner over the side of a building suspended on a single working line with a separate fall-arrest backup. OSHA wrote specific rules for this work because the failure mode is fatal. The core requirements: anchorages must be identified, inspected, and certified to hold the load; building owners must provide written assurance of that certification; and no worker may descend on a line that is not properly anchored and backed up. A crew that rigs to an un-vetted anchor, skips the building-owner certification, or works without a backup line is one anchor failure away from a death and a willful-violation citation. This article states the rule so it can be checked before anyone goes over the edge.

The rule

OSHA's general industry rules for window cleaning at height center on anchorage integrity and fall protection:

• 29 CFR 1910.27(b) governs rope descent systems. It prohibits RDS use above 300 feet unless the employer shows it is not feasible to use another system. It requires that RDS be used in accordance with manufacturer instructions and rigged by qualified personnel.
• The building owner must provide the employer written information, before the work begins, that each anchorage used for RDS has been identified, tested, certified, and maintained as capable of supporting at least 5,000 pounds in any direction for each worker attached. Two different clocks sit behind that letter and they are commonly confused: the information must be based on an annual inspection by a qualified person, and each anchorage must be certified by a qualified person as necessary and at least every 10 years. So a certification stamp older than a year is not automatically stale, but an assurance that is not backed by an inspection inside the last twelve months is. The employer must obtain the assurance and must not use anchorages without it.
• 29 CFR 1910.28 requires fall protection at the relevant heights. For RDS work this means an independent fall-arrest backup line, separate from the working descent line, attached to a separate anchorage where feasible.
• 29 CFR 1910.21 defines the terms (anchorage, qualified person, rope descent system) that the other sections rely on.

In short: certified anchors holding at least 5,000 pounds each per attached worker, written owner assurance resting on an inspection inside the last twelve months, a separate fall-arrest backup, qualified rigging, and the 300-foot ceiling absent an infeasibility showing.

The 5,000-pound figure is per worker attached to the anchorage, not a shared pool, and it is a minimum static rating, not a working load. The independent backup line is the rule that most often gets shortcut in the field and the one whose absence turns a single equipment failure into a fall. Two independent points of attachment, working line and backup, on certified anchorage, is the non-negotiable baseline for every descent.

When each applies

• The 5,000-pound certified-anchorage and written-assurance requirement applies to every RDS descent on a building, every time, before the first worker goes over. It is the owner's duty to certify and the employer's duty to obtain the assurance.
• The 300-foot limit applies whenever the descent exceeds that height; below it, RDS is permitted when properly rigged and anchored.
• The independent backup fall-arrest line applies to all RDS work; the working line alone is never sufficient.
• The annual clock: the owner's written information must rest on a qualified person's inspection from within the last twelve months, so a building serviced repeatedly needs that assurance refreshed every year. The separate certification of each anchorage runs on the longer cycle, at least every 10 years and sooner if conditions warrant. If the letter in your file is a year old with no newer inspection behind it, treat it as expired and get a current one before anyone rigs.
• Qualified-person and manufacturer-instruction requirements apply to rigging, inspection of the system, and selection of components every descent.

Field compliance flow

1. Before scheduling, request the building owner's written anchorage information. Confirm it covers every anchor to be used, states the 5,000-pound-per-worker capacity in any direction, and rests on a qualified person's inspection from within the last twelve months. No current written assurance, no descent.
2. Confirm the descent height. Above 300 feet, RDS is not permitted unless you have a documented infeasibility analysis for alternatives; otherwise use a different access method.
3. Pre-use inspect every component: descent device, working line, backup line, harness, lanyard, and connectors, per manufacturer instructions, by a qualified person. Remove any component with damage, wear, or chemical exposure.
4. Rig the working line to a certified anchor and the independent fall-arrest backup to a separate anchorage where feasible. Verify both before weighting the system.
5. Verify worker training and competency for RDS and fall-arrest use. Workers must know the system, rescue plan, and edge protection.
6. Protect lines at the roof edge against abrasion and ensure a rescue plan is in place before descent.
7. Document the inspection, the owner assurance, and the rigging check for the job record. Keep the owner's written certification on file; if an inspector or insurer asks, the burden is on the employer to show the assurance was obtained before the descent.

The common failure modes are predictable: a building manager who points at a roof davit and says it is fine without producing dated certification, a crew that rigs the backup to the same anchor as the working line because a second anchorage is inconvenient, and a certification that lapsed past 12 months on a building serviced for years. Each is a stop condition. The rule does not bend for a familiar building or a trusted manager; the written, current, capacity-rated assurance and the independent backup are required every time, no exceptions.

References

• OSHA 29 CFR 1910.27, Scaffolds and rope descent systems, including the 300-foot limit and the building-owner anchorage information requirements. (Note: this article's URL slug still carries an old 1910.23 reference. 1910.23 is the ladder standard; rope descent systems are 1910.27.)
• OSHA 29 CFR 1910.28, Duty to have fall protection and falling object protection.
• OSHA 29 CFR 1910.21, Scope and definitions for walking-working surfaces, defining anchorage, qualified person, and rope descent system.
• OSHA 29 CFR 1910.140, Personal fall protection systems, performance and inspection criteria.
• International Window Cleaning Association (IWCA) I-14.1 Window Cleaning Safety Standard, suspended and rope-descent operations.