Corrugated bitumen roofing sheets are a popular choice for sheds, garages, workshops, and garden buildings thanks to their lightweight design and ease of installation. While they’re relatively simple to work with, cutting corrugated bitumen sheets safely and accurately is essential to avoid damage, waste, or injury.
In this guide, we’ll walk you through the safest methods, best tools, and practical tips for cutting corrugated bitumen roofing sheets correctly.
Why Cutting Bitumen Sheets Correctly Matters
Cutting corrugated bitumen sheets the right way:
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Ensures a clean, professional finish
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Prevents cracking or tearing of the sheet
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Reduces material waste
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Keeps you safe during installation
Poor cutting techniques can weaken the sheet edges and shorten the lifespan of your roof.
Safety First: What You’ll Need
Before you start, make sure you have the correct safety equipment and tools.
Essential Safety Gear
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Safety gloves
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Safety goggles
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Dust mask (recommended)
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Sturdy work surface
Recommended Tools
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Fine-toothed hand saw (best for straight cuts)
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Jigsaw with a fine blade (ideal for faster cutting)
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Utility knife (for thinner sheets and trimming)
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Measuring tape and straight edge
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Marker or pencil
Best Methods for Cutting Corrugated Bitumen Sheets
Method 1: Using a Fine-Toothed Hand Saw
This is the most controlled and beginner-friendly option.
Steps:
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Measure and mark your cutting line clearly.
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Secure the sheet on a flat surface.
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Use slow, steady strokes with the saw.
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Let the saw do the work—don’t force it.
Best for: Accurate, straight cuts and small projects.
Method 2: Using a Jigsaw
A jigsaw makes cutting faster, especially for multiple sheets.
Steps:
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Fit a fine-toothed blade suitable for plastics/bitumen.
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Set the jigsaw to a low speed.
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Cut along the marked line steadily.
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Support the sheet fully to reduce vibration.
Best for: Larger projects or repetitive cuts.
Method 3: Using a Utility Knife (Thin Sheets Only)
For thinner bitumen sheets (2.6mm), a utility knife can be used.
Steps:
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Score along the marked line several times.
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Bend the sheet gently along the score.
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Snap the sheet cleanly.
Best for: Short cuts or trimming edges.
Cutting Corrugated Profiles: Helpful Tips
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Cut across the corrugations slowly to prevent tearing
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Support the peaks and valleys evenly
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Avoid cutting while the sheet is loosely supported
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Keep blades sharp for clean edges
What to Avoid When Cutting Bitumen Sheets
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❌ Using angle grinders (can melt and damage the sheet)
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❌ Cutting at high speed
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❌ Cutting without proper support
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❌ Over-tightening fixings near cut edges later on
How to Get Clean, Professional Results
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Always measure twice, cut once
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Mark lines clearly before cutting
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Cut on a warm day if possible—bitumen is more flexible
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Install eaves fillers and ridges to hide cut edges
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Use compatible fixings to prevent stress cracks
After Cutting: Installation Tips
Once your sheets are cut:
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Check edges for rough areas and tidy if needed
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Maintain correct overlaps for waterproofing
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Start installation from the lowest edge of the roof
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Avoid walking directly on unsupported sheets
Final Thoughts
Cutting corrugated bitumen roofing sheets is straightforward when done correctly. By using the right tools, wearing appropriate safety gear, and working carefully, you can achieve clean cuts and a long-lasting, professional-looking roof.
Whether you’re installing roofing on a shed, garage, or garden building, following these safety tips will help ensure a smooth and successful project.
