When installing corrugated bitumen roof sheets, it’s easy to focus on the sheets themselves and overlook the smaller accessories. One of the most commonly questioned components is eaves fillers.
So, do you really need eaves fillers for corrugated bitumen roofing?
In short: yes, in most cases they are strongly recommended. In this guide, we explain what eaves fillers do, when they’re essential, and why skipping them can shorten the life of your roof.
What Are Eaves Fillers?
Eaves fillers (sometimes called foam fillers or closures) are shaped strips designed to match the corrugated profile of bitumen roof sheets.
They are installed:
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Along the bottom edge (eaves) of the roof
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Sometimes at the ridge, depending on the system
Why Corrugated Roofs Need Fillers
Because corrugated sheets are not flat, gaps are created where the sheet meets the roof edge. Without fillers, these gaps allow unwanted elements to enter the roof space.
Eaves fillers are designed to close these gaps neatly and securely.
Key Benefits of Using Eaves Fillers
1️⃣ Prevent Water Ingress
Eaves fillers help stop:
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Wind-driven rain
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Splashback during heavy rainfall
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Water tracking back under the sheets
This is especially important in exposed UK weather conditions.
2️⃣ Keep Out Insects, Birds & Debris
Without fillers, corrugation gaps can allow:
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Birds to nest
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Wasps and insects to enter
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Leaves and debris to build up
Fillers create a physical barrier that protects the interior of your building.
3️⃣ Improve Roof Longevity
By reducing moisture, draughts, and debris build-up, eaves fillers:
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Reduce timber rot
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Protect fixings
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Help the roof last longer overall
This makes them a small but highly cost-effective addition.
4️⃣ Create a Neater, More Professional Finish
Eaves fillers improve the appearance of your roof by:
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Closing visible gaps
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Giving a cleaner edge line
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Making the installation look complete and professional
Are Eaves Fillers Always Required?
In most corrugated bitumen roofing installations, yes.
They are particularly important for:
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Sheds and garden buildings
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Garages and workshops
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Animal shelters
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Carports and storage buildings
The only situations where fillers might be omitted are:
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Temporary structures
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Fully enclosed roofs with alternative sealing systems
Even then, fillers are still recommended.
How Eaves Fillers Work with Other Roofing Components
Eaves fillers should be installed as part of a complete roofing system, alongside:
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Ridge pieces (if applicable)
Using compatible components ensures the best performance and weather resistance.
Common Mistakes to Avoid
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Skipping fillers to save time or cost
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Using the wrong profile or size
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Compressing fillers too tightly
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Leaving gaps between filler sections
Correct fitting ensures maximum effectiveness.
Frequently Asked Questions
Do eaves fillers stop leaks?
They help prevent wind-driven rain and water ingress at roof edges but must be used alongside correct overlaps and fixings.
Can I install bitumen roofing without eaves fillers?
You can, but it is not recommended. Skipping fillers increases the risk of water ingress, pests, and premature roof wear.
Are eaves fillers difficult to install?
No. They are quick and simple to fit and usually installed before the first roof sheet.
Do eaves fillers fit all bitumen sheets?
They are profile-specific, so it’s important to use fillers designed for your corrugated sheet type.
Do ridge pieces also need fillers?
Yes, ridge fillers are recommended beneath ridge caps for a fully sealed roof.
