Cut edge corrosion affects exposed edges and laps of coated metal roof sheets. The appropriate response depends on the corrosion extent, coating condition, fixings, sheet integrity and water management.
Specify from evidence
A condition survey should map affected areas and distinguish cosmetic staining from loss of section or perforation. It should also identify gutter, overlap and flashing defects that may be contributing. A coating treatment is not a substitute for structural repair where the sheet is no longer sound.
Plan safe work
Inspection and repair must account for roof access, fragile areas and edge protection. See our cut edge corrosion service for the information we assess before proposing works.