Step-by-Step Guide to Cutting Metal Roofing

Metal roofing is a durable, long-lasting option for your roof, but it requires the right tools and techniques to ensure precise cuts. Here’s a detailed guide on how to cut metal roofing panels and trims effectively.

Tools Required

1. Aviation Snips – Best for cutting small, detailed sections of trim.
2. Double Cut Power Shear – Ideal for long, straight cuts on metal panels.
3. Profile Nibbler – Great for cutting along ribs and curved sections.

Materials Required

• Metal roofing panels
• Metal roofing trim

Step 1: Cutting a Notch for Chimneys or Sidewalls

When you encounter a chimney, sidewall, or other obstructions on the roof, you’ll need to cut a notch into the metal panels.

How to Cut a Notch:

1. Mark the Notch: Start by marking the desired location of the notch on the metal panel. This will guide your cuts.
2. Cut Across the Panels (Over the Ribs):
   • Use a Profile Nibbler for cutting across the ribs. Unlike traditional cutting tools, the nibbler punches multiple small holes, which allows it to cut over the ribs effectively.
   • Move slowly as the nibbler doesn’t track straight by itself. Keep it steady and guide it along the marked lines.
3. Cut for Long, Straight Cuts:
   • For cutting along the flat parts of the panel (not over the ribs), use a Double Cut Shear. This tool makes clean, straight cuts and leaves a neat edge.
   • Be cautious of the sharp metal coil that the shear produces. It can scratch or damage the panels, so wear gloves and handle the coil with care.

Step 2: Cutting and Bending Trim Ends

At the ends of the roofing trim, tabs need to be cut so they can bend around the roof edges and create a tight seal.

How to Cut and Bend Trim Ends:

1. Make the Cuts:
   • Use Aviation Snips to make a series of small cuts (around 1 inch) at each bend of the trim. These cuts will create tabs that allow you to fold the trim around the edge of the roof.
2. Bend the Tabs:
   • Use a Hand Seamer to fold the tabs you created. This tool helps to evenly bend the metal to match the roof’s edge or peak.
3. Shape the Trim:
   • Depending on the specific trim profile, you may need to adjust the cuts and bends. Each trim will require unique cuts to fit the specific roof design.

Additional Tips:

• Wear Safety Gear: Always wear heavy-duty gloves and safety goggles when working with metal roofing to avoid cuts and debris.
• Measure Twice, Cut Once: Metal roofing is costly, and mistakes can be expensive. Double-check your measurements and markings before making cuts.
• Handle the Panels Carefully: Metal panels can be heavy and sharp. Ensure you have a stable work surface to handle and cut the panels safely.

By following this guide and using the right tools, you’ll be able to cut metal roofing with precision and create a professional-looking, durable roof.