When it comes to roofing, every component has a role to play. From the underlay to the cap sheet, and from the battens to the flashing, each part works together to create a secure, weatherproof system that keeps your home or building protected. But one of the most overlooked yet critically important parts of that system is the ridge — the highest point of a pitched roof where two sides meet. And to seal that ridge effectively, few products offer the simplicity, reliability, and cost-effectiveness of felt ridge rolls.
Felt ridge rolls are designed to provide a clean, weatherproof seal along the apex of a felted roof. They serve not only a cosmetic purpose, finishing off the look of a roofing job neatly and professionally, but also a vital functional one — they protect the vulnerable ridge line from water ingress, wind uplift, and general wear over time. Without a proper ridge covering, even the best-laid felt can be compromised as rainwater and wind are naturally drawn to high points and exposed edges on a roof.
These rolls are typically made from high-quality bitumen-based felt, similar to the cap sheets used across the rest of the roof, but with additional flexibility and reinforcement to allow for easy shaping over the ridge line. Some versions are pre-fabricated into roll form for quick application, while others may be cut to size from standard rolls depending on the needs of the project. Either way, they are a vital finishing component of any felt roof system.
What makes felt ridge rolls particularly appealing is their compatibility with a range of roofing applications. They are ideal for pitched felt roofs on sheds, garages, garden offices, workshops, and even extensions with a ridge. They provide a tidy seal that blends with the rest of the roofing system while preventing water from penetrating at the highest, most exposed part of the roof. In exposed or windy locations, ridge rolls provide an added layer of security that helps resist wind uplift and stops the ridge from lifting or peeling over time.
Installing a felt ridge roll is typically one of the final steps in the roofing process. Once the roof has been covered with underlay and top felt sheets, and all perimeter trims and flashings are in place, the ridge roll is positioned to overlap both sides of the ridge. It is then fixed using appropriate galvanized nails or felt tacks, ensuring a consistent, weather-tight seal along the entire length of the ridge. Some installers also apply cold bitumen adhesive beneath the roll to enhance waterproofing, particularly in high-risk areas or during wet seasons.
The felt ridge roll must be applied with adequate overlap to the adjoining felt surfaces on both roof slopes. This overlap ensures water runs off effectively and doesn’t find its way under the ridge covering. On roofs with a central ridge board or structural peak, the roll may be gently molded around the contour of the ridge, helping to preserve the structural shape of the roof and ensure a snug fit.
While traditional torch-on or self-adhesive felt sheets can technically be cut and applied to a ridge, dedicated ridge rolls offer a much more professional finish. They are pre-sized, easier to handle, and ensure consistency in both application and appearance. This is especially useful for contractors who want to deliver repeatable, high-quality results across multiple jobs, or for homeowners who want their garden buildings to look neat and be well-protected.
Felt ridge rolls are available in different finishes to suit a variety of roof types. Mineral-finished ridge rolls are a popular choice, offering a weather-resistant and aesthetically pleasing surface that matches standard mineral cap sheets used on most felt roofs. For a more traditional or understated look, plain bitumen rolls are also available and can be painted or left natural depending on the application.
Another reason for the popularity of felt ridge rolls is their cost-effectiveness. They provide an inexpensive solution to a common roofing challenge and can dramatically improve the longevity of a roof when used properly. For homeowners who want peace of mind without spending a fortune, adding a ridge roll is one of the smartest ways to extend the life of a felt roof. It’s also a recommended best practice by many manufacturers and roofing professionals.
In addition to protecting against rain and wind, felt ridge rolls help prevent debris, dust, and insects from getting into the ridge line. For outbuildings or sheds that house tools, supplies, or even electrical systems, that extra line of defense can make a real difference in preventing issues caused by damp, nesting animals, or long-term exposure to the elements.
Modern ridge rolls have also become easier to install thanks to improvements in manufacturing. Many now come with built-in reinforcement layers or have been treated for improved flexibility, making them easier to handle and install even during colder months. Their compatibility with self-adhesive systems and cold-applied adhesives also makes them a safe and convenient option for DIY roofing projects where using a torch may not be appropriate or permitted.
It’s important to note that while ridge rolls are highly effective, they must be installed correctly to perform their intended function. Uneven application, poor overlap, or inadequate fixing can all lead to failures over time, particularly in high wind or rain-prone areas. That’s why it’s advisable to follow manufacturer guidelines carefully or consult with a roofing professional if you’re unsure of the best application method for your structure.
For commercial jobs, ridge rolls can also be used to create uniform finishes across a series of buildings or units, making them a great option for school outbuildings, farm structures, or flat-to-pitch roof transitions where aesthetics matter as much as function. Their availability in bulk rolls or pre-cut lengths allows for easy scaling across larger projects without compromising quality.
In summary, felt ridge rolls are an indispensable part of a complete felt roofing system. They provide a critical line of defense at the most vulnerable point on the roof and deliver a clean, finished appearance that ties the entire project together. Whether you’re building a new shed, re-roofing a garage, or completing a large roofing project on a series of commercial buildings, incorporating felt ridge rolls into your design ensures long-lasting, dependable protection with minimal fuss.
If you’re sourcing felt ridge rolls, always ensure you choose a high-quality, British Standard-compliant product that matches the rest of your roofing system. Whether you’re using green mineral felt, torch-on systems, or self-adhesive membranes, there’s a compatible ridge roll available that will finish the job professionally and help protect your investment for years to come.
FAQ: Felt Ridge Rolls
1. What is a felt ridge roll?
A felt ridge roll is a flexible, bitumen-based roofing product designed to cover the ridge (the apex) of a pitched felt roof. It provides a waterproof and wind-resistant seal where two roof slopes meet, completing the felt roof system and preventing moisture or debris from entering the structure.
2. Why is a ridge roll important in a felt roof system?
The ridge is one of the most vulnerable parts of a roof, often exposed to wind-driven rain, condensation, and fluctuating temperatures. Without a properly sealed ridge roll, water can infiltrate between the roof slopes. Ridge rolls ensure a tight, weatherproof seal and improve the structural and visual finish of the roof.
3. What types of felt ridge rolls are available?
Felt ridge rolls are available in traditional bitumen-based felt, polyester-reinforced felt, mineral-finished felt, and self-adhesive varieties. Most come in rolls of various lengths and widths to suit shed roofs, garages, garden buildings, and larger residential or commercial roofs.
4. Are felt ridge rolls compatible with all types of roofing felt?
Yes, ridge rolls are typically made to be compatible with standard flat and pitched roofing felt systems, including torch-on, self-adhesive, and nail-on felt. It’s recommended to match the ridge roll to the cap sheet style (e.g., green mineral finish) for a consistent look and performance.
5. How is a felt ridge roll installed?
Felt ridge rolls are rolled out along the ridge line, overlapping each side of the pitched roof. They are then nailed, tacked, or adhered using cold bitumen adhesive or self-adhesive backing. For torch-on systems, heat may be applied to fuse the material, although this should only be done by a professional.
6. Can I install a ridge roll myself?
Yes, many DIYers install felt ridge rolls, especially on garden sheds or small outbuildings. Self-adhesive or nail-on ridge rolls are ideal for safe, flame-free installation. However, if using torch-on felt, professional installation is recommended for safety and performance.
7. What size ridge roll do I need?
The size of the ridge roll depends on the width of your roof slopes and the desired overlap. Common sizes include 300mm or 400mm wide rolls in 5m or 10m lengths. The roll should provide at least 75mm overlap on each side of the ridge to ensure water runoff and wind resistance.
8. Can I use standard felt for the ridge instead of a ridge roll?
While you technically can cut standard felt to use on the ridge, it won’t always provide the same level of flexibility or reinforcement. Ridge rolls are purpose-designed for this area and typically pre-treated to be more durable, easier to mold, and more resistant to cracking at angles.
9. Is a ridge roll waterproof?
Yes, felt ridge rolls are fully waterproof when installed correctly. They are made from bitumen-based felt with a high level of water resistance. When sealed with adhesive or fixed properly, they form a tight seal over the ridge, helping prevent leaks.
10. What tools or materials do I need to install a felt ridge roll?
For standard installation, you may need felt tacks or galvanized clout nails, a hammer, cold bitumen adhesive or torch (depending on the system), a utility knife for cutting, and measuring tools. For self-adhesive ridge rolls, a clean surface and pressure are enough to secure the roll.
11. Can I use a ridge roll on flat roofs?
Felt ridge rolls are designed for pitched roofs with a ridge line. Flat roofs do not have a ridge, so these rolls wouldn’t be suitable. Instead, flat roofs use edge trims, cap sheets, and other sealing methods to protect perimeter joints and corners.
12. How long does a ridge roll last?
When installed properly, felt ridge rolls can last between 15 to 25 years, depending on the quality of the product, exposure to weather, and the overall condition of the roof. Mineral-finished rolls tend to have longer lifespans due to UV resistance and surface durability.
13. Can a ridge roll be replaced without redoing the entire roof?
Yes, if the ridge roll has failed but the rest of the felt is intact, it can often be removed and replaced independently. Care must be taken not to damage the adjoining cap sheets. Re-sealing with compatible felt and adhesive ensures continued waterproofing.
14. Are ridge rolls suitable for commercial or agricultural buildings?
Absolutely. Ridge rolls are used on garages, warehouses, barns, and other commercial or rural structures with felt roofs. Their simple application and cost-effectiveness make them popular for non-residential projects as well as domestic use.
15. Do ridge rolls come with a warranty?
Many manufacturers offer warranties on felt ridge rolls, often between 10 and 20 years depending on the product. Warranties are usually valid when the product is installed according to manufacturer instructions and used with compatible materials.
16. Can ridge rolls prevent condensation or improve ventilation?
While ridge rolls seal the ridge from external weather, they do not typically provide ventilation. Ventilation systems must be designed separately using breathable membranes, ridge vents, or eaves vents. That said, sealing the ridge properly helps prevent cold spots where condensation can form internally.
17. Where can I buy quality felt ridge rolls?
Felt ridge rolls are available at specialist roofing suppliers, builders’ merchants, and online platforms like GetYourselfFelt.co.uk. Choose a supplier that offers British Standard-compliant products, installation advice, and accessories like adhesives and tacks.
18. Do ridge rolls add to the appearance of the roof?
Yes, when matched correctly, ridge rolls give a clean, professional finish that enhances the look of the roof. Mineral-finished rolls, in particular, complement the rest of the felt and make the ridge line look neat, uniform, and well-protected.
Matthew Phillips 
