Eurocode 3 is the primary structural design standard for steel-framed commercial buildings and their roof structures. For solar PV structural assessments, EN 1993-1-1 (general rules) and EN 1993-1-3 (cold-formed sections) are most frequently applied. EN 1993-1-3 covers the cold-formed Z and C purlins used in the vast majority of UK commercial portal frame roofs.
Section resistance checks under Eurocode 3 use partial safety factors for material strength. The UK National Annex confirms these factors and any nationally determined modifications. Solar Surveys structural calculations present explicit Eurocode 3 utilisation ratios for each structural member checked, enabling transparent verification by third-party engineers or technical advisors.