How to Fix a Leak in Your Corrugated Metal Roof

Corrugated metal roofs are sometimes vulnerable to damage from strong winds and moisture. The individual roofing plates are attached to metal or wood trusses, and when the screws or nails rust, leaks can be caused. In order to fix leaks in a corrugated metal roof, you need to first find the source of the leak. Fasteners and roof panel edges are often the culprits.

What You Will Need

In order to fix leaks in your corrugated metal roof during your metal roofing repair project, you will need to acquire some of the following items:

  • Hammer and nail bar
  • Wire brush
  • Extension adder
  • Aluminum screw nails
  • Plastic putty knife
  • Urethane roof cement
  • Paintbrush
  • Metal roofing coat
  • Fabric shears

Roof Panel Edges

When inspecting roof panels for leaks, look for gaps in areas where edges overlap with adjacent panels, as gaps can be a source of leaks during rain. Remove rust and debris from panels through the use of a wire brush. Be sure to cover the base coat area using a glass membrane fabric piece, and then apply a urethane topcoat over the membrane to secure it. This can help to correct previous leaks and prevent future leaks from occurring in the future.


If you expect that your roof fasteners have a leak, inspect each row of screws and nails by walking on top of the row instead of between them. Use a nail bar to pull out any nails, and then use an aluminum screw-nail in the area in which it was removed. If steel screws are located with heads that have been rusted away, use a drill to drive in galvanized screws next to them. Use urethane cement where the new screw or nail has been installed, and also inspect caulked seems to look for gaps and cracks.