A metal roof is worth considering above all when you want to reduce the weight transferred to the structure — both in a new design and when replacing an old covering. Before choosing a profile and format, however, check the condition of the roof truss, the snow load and the wind action. A lightweight material will not repair weakened joints or damp timber. Compare weight for a specific sheet thickness, not a general declaration. Bear in mind too that attic comfort depends on the whole layer build-up, not the panel alone.

Before you start clearing snow, establish a plan that considers the roof's load-bearing capacity, its shape and people's safety. The layer's thickness does not reflect the actual load – wet snow and ice are far heavier than powder. Carry out the work with proper access and protection, and do not chip ice off metal coverings. What matters is the weight of the snow lying there, how unevenly it is distributed and the condition of the structure. Drifts near higher parts of the building load the roof differently from an even layer. Do not assume one centimetre figure is safe for every building. Visible deformation, unusual cracking or faults in building elements require prompt assessment by a specialist.