Profiled metal roofing buckling or twisting

Cause

Inadequate allowance for thermal movement at fixings – this occurs more commonly with dark coloured and aluminium roofs

Repair

  • remove fixings, enlarge fixing holes and replace fixings with new waterproof washers and fixings
  • ensure that the new washers and screw caps cover the enlarged fixing holes and are securely in place
  • consider painting the roof a light colour after repairing fixings