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Roofing Felt - What is and Why Is It Used? - Timber DIY

Roofing Felt - What is and Why Is It Used?

Are you looking for a reliable way to protect your garden building or shed from the elements? If so, roofing felt may be the perfect solution. Roofing felt is an affordable and protective layer of tear-resistant roofing material designed to provide maximum durability and longevity, helping to ensure that whatever lies beneath remains waterproof, dry and secure. With careful attention paid during installation, it can even provide extra insulation against heat or cold weather extremes.


What is Roofing Felt and Why Is It Used on Roofs?

Roofing Felt is made from a mixture of fibres, including wood pulp and cotton, pressed together to form a water-resistant but breathable material. Roofers install Roofing Felt on top of other layers of roofing material to provide an additional layer of protection by providing a barrier against moisture and temperature fluctuations. Roofing Felt is commonly used as the first layer of materials in sheds and construction projects, since it provides a cost-effective way to waterproof the structure while allowing air and moisture vapor to escape. Roofing Felt can be either applied with nails or with an asphalt adhesive for added protection. Roofing Felt is an essential component to protect your home from the elements and extend its longevity.


slicing Roof Felt with a stanley knife

Different Types of Roofing Felt

Supa Tec, Torch SBS, Polyester Mineral Felt, Polyester Shed Roofing Felt, and Strotex are all common types of roofing felt commonly used in the construction industry. Supa Tec is a high-performance heavy-duty roofing felt with a mineral surface that creates a waterproof layer. Torch SBS is another type of roofing felt which is formulated to repel water and eliminate seepage, unlike Supa Tec. Polyester Mineral Felt provides superior weather protection as it insulates against heat and cold while remaining lightweight. For smaller roofs such as sheds, there’s Polyester Shed Roofing Felt which only requires one layer to provide waterproofness along with flexibility. Finally, Strotex is an extremely durable layer of the sheet that offers a smooth finish to roofs while ensuring they are airtight with its advanced sealing technology.

hammering a nail to secure roofing felt in place

How to Install Roofing Felt

Installing roofing felt is an important process in making sure your home is well-protected from the elements. It is a multi-step process including laying and overlapping the felt, sealing the extra around the perimeter of the roof, and nailing and capping each installation. Before beginning, always be sure to have all necessary supplies close by for easy access, read the manufacturer's instructions for specific guidelines based on the materials at hand, and remember to wear gloves when handling the felt rolls as they can be quite abrasive. Once you begin the process it should not take long to cover the whole roof with a protective layer of roofing felt. Following these simple steps will ensure you have properly installed roofing felt that will weather future storms and provide protection to your home.

Common Mistakes When Installing Roofing Felt

Installing roofing felt is an important part of any tiling job - and it's easy to get wrong. If you're looking to start laying down felt, make sure you avoid some of the most common mistakes. Without proper planning, overlapping can be done incorrectly or may not line up correctly with gutters and edging, resulting in water leaking into the house. Laying felt also requires tension to create even and secure coverage on the roof so all areas are protected - if too much tension is applied it can damage shingles and felt, or even break off nails. The last thing to look out for is the number of layers being used - the product manufacturer will have recommendations for the best approach when it comes to multiple layers so make sure you find out what those are before starting your roofing work.

installing roofing felt

Benefits of Using Roofing Felt

Installing roofing felt under shingles on your roof can provide many benefits. It helps to waterproof the roof, protect against strong winds and even guard against ice and snow damage. It also helps to reduce water leakage, as well as insulate against both sound and cold weather. Additionally, it adds an extra layer of protection to help keep shingle algae at bay, preventing them from becoming brittle over time. It is advised that homeowners opt for roofing felt in order to ensure maximum protection of the roof and its associated components. Installation should be completed by an experienced contractor in order to maximise lifetime roof protection and minimise potential repair costs in the future.

Important Considerations Before Purchasing Roofing Felt

There are some crucial considerations to make before purchasing roofing felt. Quality is arguably the most important factor to consider when undergoing an external building project, and it is vital that you research into the different types of roofing felt available and select one of a quality standard suitable for your budget and needs. When choosing roofing felt, also ensure that it is suitable for the size of the area you are covering and look for any further standards or specifications that may be required due to weather characteristics, pitch constancy or helpful guarantees from the manufacturer. Weight is another point to keep in mind when choosing a type of roofing felt, as too heavy a weight could cause serious damage if applied on a domestic house. Additionally, looking into customer reviews or advice from local professionals can help when deciding which kind of felt may be right for you.


In conclusion, roofing felt is a great way to protect your roof from damaging elements and ensure it remains strong for many years. It is important, however, to properly research the different types of felt and create a plan for installation beforehand. If installed and maintained correctly, roofing felt can be an invaluable part of a well-regulated roof system and provide great benefits, such as increased structural stability, reduced chance of water damage, reduced interior humidity levels and sound insulation. Before making the decision on how to best protect your roof with when installing roofing felt, be sure to discuss all your options with a professional contractor who can provide you with accurate information and guidance on which option works best for you.

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