When installing corrugated bitumen roofing sheets, using the correct accessories is just as important as choosing the right sheet thickness. Ridges, fillers, and fixings work together to create a strong, weatherproof, and long-lasting roof. Without them, even the best roofing sheets can fail prematurely.
In this guide, we’ll explain what each accessory does, why it matters, and how to use it correctly when installing corrugated bitumen roofing.
Why Roofing Accessories Matter
Corrugated bitumen sheets are designed to protect buildings from rain, wind, and UV exposure—but only when installed as a complete system. The correct accessories:
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Prevent water ingress
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Reduce wind uplift
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Extend roof lifespan
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Improve overall appearance
Skipping accessories to save time or money often leads to leaks, loose sheets, and early roof failure.
Ridges: Sealing the Roof Apex
What Are Bitumen Ridge Pieces?
Ridge pieces sit along the apex (peak) of the roof, covering the joint where two roof slopes meet. They provide a watertight seal while allowing airflow beneath the roof.
Why Ridges Are Essential
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Stop rain entering at the roof’s highest point
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Protect sheet edges from wind uplift
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Improve structural stability
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Provide a neat, professional finish
Installation Tips
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Always use ridges that match your sheet profile
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Maintain recommended overlaps
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Fix securely using compatible bitumen nails or fixings
Fillers: Blocking Gaps and Improving Protection
What Are Corrugated Bitumen Fillers?
Fillers are shaped strips that fit the corrugated profile of bitumen sheets. They’re installed at the eaves and ridge to seal gaps between the sheets and the roof structure.
Benefits of Using Fillers
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Prevent rain, snow, and wind-driven moisture
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Stop insects, birds, and debris entering
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Improve insulation and airflow control
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Reduce roof rattling in windy conditions
Where Fillers Are Used
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Eaves fillers: At the lower edge of the roof
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Ridge fillers: Under ridge caps
Fillers are especially important in exposed or windy locations.
Fixings: Securing the Roofing Sheets
What Fixings Should Be Used?
Corrugated bitumen roofing requires specialist bitumen nails or screws, designed to hold sheets securely without cracking them.
Why Correct Fixings Matter
Using incorrect fixings can cause:
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Sheet cracking
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Leaks around fixing points
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Loose sheets during high winds
Best Practices for Fixings
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Fix through the crest of the corrugation
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Use the correct spacing as recommended
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Avoid over-tightening
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Use corrosion-resistant fixings
Correct fixings ensure long-term stability and weather resistance.
Common Installation Mistakes to Avoid
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Skipping ridges or fillers
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Using general nails instead of bitumen fixings
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Over-tightening fixings
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Incorrect overlaps
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Mixing incompatible brands or profiles
Avoiding these mistakes can significantly extend the life of your roof.
Choosing the Right Accessories
To get the best results:
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Use accessories designed specifically for corrugated bitumen sheets
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Match the profile and thickness of your roofing sheets
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Avoid cheap, incompatible alternatives
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Choose thicker sheets (2.6mm+) for better performance
This ensures your roofing system works together as intended.
Best Applications for Corrugated Bitumen Roofing Systems
Corrugated bitumen roofing systems are ideal for:
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Garden sheds and storage buildings
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Garages and workshops
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Stables and agricultural buildings
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Playhouses and utility shelters
Using the full system—sheets, ridges, fillers, and fixings—ensures maximum durability in all weather conditions.
Final Thoughts
Corrugated bitumen roofing accessories are not optional extras—they are essential components of a reliable roofing system. Ridges seal the apex, fillers block gaps, and fixings secure the sheets, protecting your building from the elements and extending roof lifespan.
By using the correct accessories and installing them properly, you’ll achieve a strong, weatherproof, and professional-quality roof that performs well for years to come.
