Height Safety for Buildings with Rooftop Solar Panels

Why solar changes the height safety equation

A bare roof is relatively simple to protect. Anchor points on a grid, a static line along the maintenance route, or guardrails at the edge. Once solar panels are installed, the available roof area for anchor points shrinks, the access paths become constrained, and the fall clearance calculations change because panels create elevated trip points.

The most cost-effective approach is to design the height safety system before the solar array is installed. Retrofitting height safety around an existing solar installation is significantly more expensive because anchor points need to work around panel locations, walkways need to thread between rows, and the solar installer may need to remove panels to allow fixing access.

Access paths between panel rows

Solar arrays are typically installed with gaps between rows to allow for maintenance access and to avoid self-shading. These gaps also serve as access paths for roof maintenance. The height safety system should designate these gaps as walkway routes and provide fall protection along them.

Walkway systems installed between panel rows serve a dual purpose: they protect the roof membrane from foot traffic damage (which can cause leaks) and they clearly mark the safe access route. Without walkways, maintenance workers may walk on panels, step on electrical conduits, or cross fragile roof areas to reach maintenance equipment.

Anchor point considerations

Roof anchor points need clear airspace around them. A worker connected to an anchor point by a lanyard needs to be able to move within the system radius without the lanyard snagging on solar panel frames, electrical conduits, or mounting rails.

This means anchor point locations must be coordinated with the solar array layout. Anchors installed in panel rows will be inaccessible once the solar is installed. Anchors at row ends or in designated access corridors are the practical solution.

Non-penetrating anchor systems are preferred where the roof membrane is a critical waterproofing element. These systems distribute load across the roof surface using weighted base plates rather than through-fixing to the roof structure. They avoid creating potential leak points, which is particularly important on membrane roofs under solar arrays where leak detection is difficult.

Fall clearance with solar panels

Fall clearance is the total distance below the anchor point that must be kept clear to safely arrest a fall. This includes the lanyard length, energy absorber deployment, harness stretch, and the height of the worker. The calculation assumes the worker falls from the anchor point and must stop before hitting the ground or any obstruction below.

Solar panels add a complication: a worker who trips over a panel frame may fall in a different direction than planned, potentially swinging into panels or structural elements. The height safety designer needs to account for swing fall scenarios where the worker falls at an angle to the anchor point.

Coordination between trades

The height safety installer and the solar installer need to coordinate their work sequences. The recommended approach is:

• Height safety designer produces the anchor point layout coordinated with the solar array plan
• Height safety installer installs anchor points and walkways before the solar installation begins
• Solar installer installs arrays around the established anchor points and walkways
• Height safety inspector conducts final certification of the completed system

If the solar is already installed, the height safety assessment must work around the existing array. This typically requires the solar installer to be on site during the height safety installation to temporarily disconnect panels that obstruct anchor point installation.

Ongoing maintenance access

Solar panels need periodic cleaning, inspection, and occasional replacement. The height safety system must provide safe access for solar maintenance as well as for the original roof maintenance tasks (HVAC servicing, gutter cleaning, roof repairs).

A well-designed system provides continuous fall protection from the roof access point to both the solar array and the building plant, without requiring workers to disconnect and reconnect between zones.

References

• AS/NZS 1891.4:2025: Selection, use and maintenance of fall protection equipment
• AS 5532:2025: Manufacturing requirements for anchor devices
• Safe Work Australia: Managing the Risk of Falls at Workplaces