Scaffold and roof access

How safe roof access and edge protection are planned for a solar installation, including when scaffold or another system is suitable.

Solar installation combines work at height with large glass modules, tools and live electrical equipment. The access arrangement must let people reach the work, handle materials and prevent falls throughout the job.

“Scaffold included” does not describe the access arrangement. The scaffold or alternative system has to fit the roof, array, loading method and hazards found at the property.

What the law requires

The Work at Height Regulations require work at height to be properly planned, supervised and carried out by competent people using suitable equipment. The risk-control hierarchy is to avoid work at height where reasonably practicable, prevent falls where it cannot be avoided, then minimise the distance and consequences of any remaining fall.

Collective protection, such as a guarded working platform or edge protection, protects everyone without each person having to clip on correctly. It is normally preferred to relying on harnesses alone.

The law does not contain a sentence saying that every solar job must use a full traditional scaffold. It requires a safe system selected from the risk assessment. HSE’s roof-work guidance is nevertheless clear that sloping roofs require scaffolding to prevent people or materials falling from the edge, with edge protection at the eaves. Its limited ladder exception is for short tasks measured in minutes. Installing a domestic array is not normally that kind of task.

On a flat roof, suitable edge protection may provide the collective protection without a full facade scaffold. The route onto the roof and the way modules are lifted still need to be solved.

Design the access around the installation

The installer and scaffold contractor need enough information to design the arrangement before it is erected. That includes:

building dimensions, roof slopes and array position
platform position and the areas where people will work
the number and size of modules and how they will be lifted
people, tools and materials expected on each platform
ground conditions, conservatories, extensions and other obstructions
rooflights, openings and potentially fragile surfaces
overhead lines and underground or incoming services
public access, roads, pavements and neighbouring land
sheeting, netting, hoists or loading bays that alter scaffold loads
how someone would be rescued after an incident

A standard configuration can follow recognised guidance such as TG20. A scaffold outside the permitted configuration needs a bespoke design by a competent person. Users should not remove ties, boards or guardrails to make a panel fit; a required alteration goes back to the scaffold contractor or designer.

What suitable edge protection looks like

The working platform should serve the work area and allow safe handling at the eaves. Guardrails, intermediate protection and toe boards prevent people, tools and materials falling. Gable ends or an array close to a roof side may need additional edge protection, because an eaves platform alone does not prevent a sideways fall.

Safe access may use a ladder bay, stair tower or another designed route. Openings need gates or equivalent protection, and unauthorised public access may need controlling. The platform and any loading bay must have an adequate declared load class for the workers, modules, tools and lifting equipment.

Netting and sheeting are not harmless extras. They can greatly increase wind load and must be included in the design. The same applies to hoists, bridges and cantilevered sections.

Fragile roofs and rooflights

HSE says every roof should be treated as fragile until a competent person confirms otherwise. Profiled sheets, weathered coverings and rooflights deserve particular care. A rooflight may be difficult to see or obscured by dirt or paint.

Work on or near a fragile surface can require stagings, guardrails, restraint or arrest systems and safety nets beneath the work. Barriers or secured, labelled covers should protect rooflights. A harness does not make a fragile sheet safe to stand on.

The method statement should also protect the roof itself. Installers need defined routes that avoid cracking tiles, overloading weak areas or walking on unsupported module rails.

Ladders, towers and mobile platforms

A ladder can provide access or support low-risk, short-duration work when the risk assessment shows that more protective equipment is not justified. It is not a working plan for carrying full-size modules around an unprotected pitched roof.

A mobile tower can provide a guarded platform in the area it covers, but it does not automatically protect the rest of a sloping roof edge. It can be part of a suitable system if the complete arrangement controls the actual fall and handling risks.

A mobile elevating work platform can be appropriate where the machine, ground, reach and operators suit the job. HSE notes that climbing out of a MEWP basket is not normally recommended. If the work requires people to leave the basket and move across a roof, the design must address the roof hazards separately.

Roof ladders, temporary edge-protection systems and specialist access platforms can also form part of a safe solution. Product availability does not establish suitability; the documented assessment does.

Inspection and handover of scaffold

The scaffold user’s or hirer’s responsibility includes ensuring that a competent person inspects it:

after installation and before first use
at intervals no longer than seven days while it remains in use
after high winds or another event that could affect safety
after relevant alteration

Defects and corrective actions belong in the inspection report. An inspection tag is a useful visual control, but the record and competent inspection are what matter.

Erection, significant alteration and dismantling should be undertaken by people competent for the type and complexity of scaffold, with appropriate supervision. The solar team should check the scaffold against its access plan before starting roof work.

Weather and changing conditions

An access system that was adequate when erected can become unsafe in high wind, rain, ice or extreme heat. Modules act like sails during handling, and a dry tile roof can become slippery quickly.

The method statement should set stop-work conditions and identify who makes the decision. Programme pressure or a booked scaffold collection is not a reason to continue when controls no longer work.

Permissions and responsibility

Scaffold on a public highway or pavement normally requires permission from the relevant highway authority. Scaffold standing on or oversailing neighbouring land needs the appropriate agreement. The contractor should establish local requirements, pedestrian controls and responsibility for applications before arrival.

The customer should be told:

which areas must be kept clear
whether vehicles, gates or entrances will be affected
who arranges licences or neighbour access
the intended erection and removal window
who to contact if the scaffold is damaged or interfered with

Complexity, access, permits, duration and design determine both cost and programme. Fixed national price bands and assumed hire periods do not describe the access requirements for a particular property.

Access and edge-protection design

The chosen access method determines the edge protection, material-lifting route and any special scaffold design. A site-specific risk assessment and method statement must address falls, fragile surfaces, manual handling, electrical hazards and rescue before work starts.

The plan should make sense for the final module layout. If installers would have to reach beyond protection, climb over a ridge or carry panels across an unprotected roof, the access design is incomplete.