Planning safe snow removal from a roof
Renovation and maintenance
The key is assessing the structure, not the snow depth alone. A building owner should check whether the roof’s design conditions are known and whether snow lies evenly. Fresh powder and wet, compacted snow of the same depth can mean different loads, so a handbook figure in centimetres is not enough. It is also worth establishing how to secure the area under the eaves and protect the metal coating during work. The scope of work for a crew should follow from documentation and observations made from a safe place, not from generic recommendations.
Why is snow height alone not enough?
The same thickness of fresh powder and wet, compacted snow does not mean the same load. Snow can also accumulate unevenly at obstacles and changes in roof height. The need for action should therefore not be determined solely by the number of centimetres found in a guide.
The basis is the structure and the service conditions intended for it. Larger facilities require an inspection plan and a method for assessing accumulated snow. In the absence of documentation, a technical assessment should be commissioned. T35 trapezoidal sheet, high trapezoidal profile and insulated sandwich panels have different operating conditions, and the product name does not determine the load-bearing capacity of the entire roof.
What can be observed from a safe place?
From the ground, overhangs, large snow accumulations and deformation of visible elements can be noticed. Inside the building, new deformations or other sudden changes to the structure may be concerning. However, such observation alone does not allow the remaining load reserve to be determined.
If overloading is suspected, do not go onto the roof to inspect it closely. Access to the endangered zone must be restricted and an assessment by those responsible for the safety of the building must be obtained urgently. The added weight of people and equipment can be significant. The action plan should take into account the condition of the structure, not only the need to remove visible snow.
How to prepare the scope of works for the team?
Provide the roof documentation, the type of covering and the layout of elements hidden under the snow. Skylights, penetrations, installations and permitted access points are important. Also mark the building entrances and traffic routes below the eaves. The team needs this information to prepare a safe organisation of work.
The method of protecting people, the locations for depositing or collecting snow and the restrictions resulting from weather must be established. The sequence of load relief must correspond to the structure. New piles should not be created at random locations on the roof slope. General advice to start from any edge does not replace a plan for a specific building.
How to protect the sheet metal during snow removal?
Tools and method should limit the risk of scratching the coating and damaging the profiles. Sharp metal edges can compromise the steel protection. Ice must not be chipped off the covering, nor should flashings be used as a support point for tools. The working method must be adapted to the material documentation.
Particular care is required around screws, laps and service penetrations. Their position may be invisible under snow. Work should not consist of aggressively cleaning the surface to a shine. The aim is controlled relief of the roof without creating damage that will show up at the next rain.
What should be protected under the eaves?
Sliding snow and ice can endanger people and damage equipment around the building. The work zone must be separated from pedestrian and vehicle traffic. It is not enough to place markings in a spot that remains invisible from a second entrance. The arrangements should cover all access routes to the affected area.
Gutters, pipes and façade elements must also be taken into account. They should not accidentally receive dropped loads. The snow reception point must be prepared before work begins. At a site with an operating company, it is worth coordinating the works with deliveries and staff movement.
Do snow guards solve the problem?
Snow guards and other snow-retention elements limit uncontrolled sliding of snow. Their layout and fixings must match the covering and the loads. However, they do not by themselves reduce the weight of snow lying on the structure. They are therefore not a substitute for assessing the roof load.
Before winter, it is worth checking the condition of their fixings and support. After heavy snowfall or deformation, a further inspection is needed. An additional snow guard accidentally fixed to thin cladding may not perform as expected. The selection should be part of the technical solution for the entire roof.
What should be checked after the work is completed?
Under safe conditions, the covering, flashings, drainage and installation elements are assessed. Attention is paid to cracks, deformation and disturbed connections. Defects must be documented and a repair method established that is consistent with the coating and the warranty conditions. It is not worth postponing their assessment until a leak appears.
Keep records of the scope of works and of the places where snow was observed to accumulate. They will help prepare for the next winter and improve the building maintenance plan. Safe snow removal begins before the team goes onto the roof. It requires knowledge of the structure, protection of the surroundings and a method that does not damage the covering.
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