Skylights provide valuable natural light and ventilation, but they can create a serious fall-through hazard when installed on commercial and industrial roofs. A skylight may appear strong enough to walk on, yet many skylight assemblies—especially older or deteriorated units—are not designed to support a person’s weight. Proper skylight protection is therefore an important part of commercial roof safety, maintenance, and fall protection.
Why Are Skylights a Fall-Through Hazard?
A skylight is essentially an opening in the roof that allows light into the building. If a worker steps onto a skylight that cannot support their weight, the glazing or supporting frame can break, potentially resulting in a fall to the level below.
OSHA specifically recognizes skylights as holes for fall-protection purposes. Under OSHA’s general-industry requirements, employees must be protected from falling through holes, including skylights, when the fall distance is 4 feet or more. Acceptable protection can include covers, guardrail systems, travel restraint systems, or personal fall arrest systems.
For construction activities, OSHA’s requirements generally address skylights as holes where employees could fall more than 6 feet to a lower level. Protection can include compliant covers, guardrails around the skylight, or personal fall arrest systems.
Common Ways Skylights Are Protected
1. Skylight Screens
One of the most common solutions is a properly engineered skylight screen. A screen is installed above or around the skylight to prevent a worker from falling through the opening if they accidentally step onto the skylight.
OSHA guidance has historically recognized skylight screens as a method of guarding skylights and states that a screen should be capable of supporting at least a 200-pound load when applicable.
Screens should be securely attached and designed for the specific roof and skylight configuration rather than simply placed over the opening.
2. Guardrails
Guardrails can be installed around skylights to create a physical barrier between workers and the opening. A properly designed guardrail system includes a top rail and appropriate intermediate protection.
OSHA’s general-industry criteria specify that guardrail systems must be capable of resisting a 200-pound force applied in the required directions, while intermediate members must also meet specified strength requirements.
Guardrails can be especially useful around large skylights, groups of skylights, or roof areas where regular maintenance personnel may work.
3. Skylight Covers
A compliant cover can protect a skylight opening by preventing a person from stepping or falling through it. Covers must be properly secured and strong enough for the anticipated loads. Construction requirements also address protection against objects falling through holes, including skylights.
A temporary cover should never be treated as adequate simply because it looks sturdy. Its strength, attachment, labeling, and configuration should be evaluated according to the applicable safety requirements.
4. Personal Fall Protection
In some situations, workers may use personal fall arrest or travel restraint systems. These systems can provide additional protection when workers need to access areas around skylights for inspection, maintenance, repair, or replacement.
However, personal fall protection should be properly selected, installed, inspected, and used by trained personnel.
What About Old or Damaged Skylights?
Age, ultraviolet exposure, weather, impact, and material deterioration can reduce the strength of a skylight. A translucent panel that was once structurally sound may become brittle over time.
Roof owners and facility managers should therefore avoid assuming that an existing skylight can support a person simply because it has been in place for years. Damaged or deteriorated skylights should be evaluated and repaired, replaced, or protected as appropriate.
Protecting Skylights During Commercial Roof Work
Roof contractors should identify skylights before beginning maintenance, inspections, coating, restoration, or replacement work. Workers should know where skylights are located and understand that they are not walking surfaces unless specifically designed and rated for that purpose.
For commercial buildings, professional roof inspections can help identify deteriorated skylights, missing screens, inadequate guards, and other fall-through hazards before they result in an accident.
Final Takeaway
Skylights are protected against fall-through primarily through properly designed skylight screens, guardrails, compliant covers, travel restraint systems, or personal fall arrest systems, depending on the roof, work activity, and applicable safety requirements. OSHA explicitly treats skylights as potential fall-through hazards, making proper protection an important component of commercial roof safety.
If your commercial roof has aging, damaged, or unprotected skylights, a professional roofing contractor can evaluate the existing conditions and recommend an appropriate protection or replacement solution. Proper skylight protection helps protect workers, maintenance personnel, and building occupants while reducing the risk associated with one of the most dangerous hazards on a commercial roof.
Related Questions
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- What is the difference between a unit skylight and a structural skylight?
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