At Riverside Roofing, we’ve worked on all types of roofs across the North East, and one of the most common materials we install is roofing felt. Whether it’s for a shed, garage, extension, or a flat roof, roofing felt remains a reliable and cost-effective solution when fitted correctly. Knowing how to install it properly can make a big difference in how long your roof lasts and how well it performs against the British weather.
As experienced roofers in Middlesbrough, we’ve seen first-hand what happens when roofing felt is poorly installed. Leaks, lifting edges, and early wear are all common problems that can easily be avoided with the right approach. In this guide, we’ll walk you through how roofing felt should be fitted, sharing practical advice based on real experience in the trade.
What Is Roofing Felt and Where Is It Used?
Roofing felt is a protective layer that acts as a waterproof barrier on flat or low-pitched roofs. It is typically made from a base material that is reinforced with bitumen, making it strong, flexible, and resistant to water. It is widely used on garages, sheds, extensions, and some residential flat roofs because it offers a good balance between durability and cost.
In the UK, roofing felt is often applied in layers to improve its strength and lifespan. These layers usually include a base sheet, a middle layer, and a top layer, each serving a specific purpose. When installed properly, felt roofing can last for many years and provide reliable protection against rain, wind, and cold weather. However, like any roofing system, its performance depends heavily on the quality of installation.
Preparing the Roof Surface
Before fitting roofing felt, proper preparation is essential. The roof surface must be clean, dry, and structurally sound. Any old or damaged felt should be removed, along with debris such as dust, moss, or loose materials. If the timber decking underneath is rotten or uneven, it should be replaced or repaired before continuing.
At Riverside Roofing, we always stress the importance of a solid base. Roofing felt relies on a smooth and stable surface to adhere properly. If the decking is uneven or weak, the felt will not sit correctly, which can lead to pooling water or premature damage. Taking the time to prepare the surface properly will ensure a much better finish and a longer-lasting result.
It is also important to check the weather conditions before starting. Roofing felt should ideally be installed in dry weather, as moisture can affect how well it bonds and seals.
Laying the First Layer of Felt
The first layer of roofing felt is often referred to as the underlay or base sheet. This layer forms the foundation for the rest of the system and must be laid carefully. The felt should be rolled out across the roof, making sure it is straight and aligned correctly.
Once positioned, it is usually fixed in place using clout nails or adhesive, depending on the type of system being installed. The felt should be secured firmly but not stretched too tightly, as this can cause problems later on when temperatures change. Each strip of felt should slightly overlap the previous one to prevent water from getting through the joints.
At Riverside Roofing, we always ensure overlaps are neat and consistent, as this is a key part of keeping the roof watertight. Even small gaps or uneven edges can allow water to seep in over time.
Adding the Top Layer and Sealing the Roof
The top layer of roofing felt is what provides the main waterproof protection. This layer is often finished with a mineral surface, which helps protect against UV damage and gives the roof a clean appearance. The top sheet is carefully rolled out over the base layer, making sure it lines up properly with the edges and overlaps.
Heat is usually applied using a gas torch to bond the felt securely to the layer below. This process, often known as torch-on felt roofing, creates a strong and durable seal that prevents water from penetrating the surface. It is important to apply heat evenly and avoid overheating, as this can damage the felt or create weak spots.
Edges, corners, and joints need extra attention during this stage. These areas are more vulnerable to leaks, so they must be sealed properly to ensure full protection. When done correctly, the finished roof should look smooth, secure, and fully watertight.
Common Mistakes to Avoid
Over the years, we’ve come across many roofing felt installations that have failed due to simple mistakes. One of the most common issues is poor preparation, where the surface has not been properly cleaned or repaired before fitting. This can lead to uneven felt and water pooling on the roof.
Another frequent problem is incorrect overlapping. If the felt sheets are not overlapped enough, or if they are laid in the wrong direction, water can easily find its way underneath. Similarly, using too few fixings or applying uneven heat can weaken the bond between layers.
Trying to rush the job is another mistake that often leads to poor results. Roofing felt installation requires patience and attention to detail. Taking shortcuts might save time initially, but it often results in costly repairs later on. At Riverside Roofing, we always take the time to do the job properly, ensuring a finish that lasts.
When to Call a Professional Roofer
While it is possible to fit roofing felt yourself, it is not always the best option, especially for larger or more complex roofs. Working with roofing materials and tools such as gas torches can be dangerous without the right experience. There is also a risk of incorrect installation, which can lead to leaks and further damage.
If you are unsure about any part of the process, it is always worth speaking to a professional. At Riverside Roofing, we provide expert roofing services across the North East, ensuring every job is completed safely and to a high standard. We understand the local climate and know what it takes to install a roof that can handle it.
Final Thoughts
Fitting roofing felt may seem straightforward, but getting it right requires careful preparation, the right materials, and proper technique. From preparing the roof surface to sealing the final layer, every step plays a role in the overall performance of the roof.
At Riverside Roofing, we’ve built our reputation on delivering reliable, long-lasting roofing solutions. Whether you are planning a small project or need help with a full roof installation, we are always here to offer advice and support. A well-installed felt roof can provide years of protection, and with the right approach, it is an investment that truly pays off. Contact us to find out more.