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Roofing Felt

Roofing felt is a fantastic roofing material for achieving a durable, weatherproof finish on outbuildings such as garden sheds or garages. Known for its cost-effectiveness and simple installation, roo...

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Common Questions

What is Roofing Felt Made Of?

Roofing felt has come on leaps and bounds since its inception in 19th Century California, where it was used as a low-cost waterproofing solution. Roofing felt is generally composed of two primary elements, known as the base and the carrier. The base is usually made from either natural or synthetic materials such as cellulose fibres or fibreglass, which is then saturated in waterproof bitumen known as the “carrier”. The carrier is what lends roof felt its weatherproof properties along with its ability to breathe effectively.

How Much Roofing Felt Do I Need?

The amount of felt you’ll need to cover your roof will naturally depend on its size. For example, if you’re just looking to re-roof a standard 4x6 garden shed, all you should need is one 1x8m roll of felt. To calculate how much roofing felt you’ll need, first measure the width and length of your structure at ground level. Then, multiply this figure by around 1.25 – 1.4 depending on how steep the pitch of the roof is. Finally, tack on an additional 10% to account for wastage. You should now know how many rolls you’ll need.

How Long Does Roofing Felt Last?

Whilst felt roofing is highly durable, its longevity can vary wildly depending on how correctly it was installed, and how much it is maintained. Felt roofs covering structures that are regularly exposed to severe weather such as hailstorms can expect to need replacing as quickly as 2 years’ time, but most roofing felt is capable of lasting 5, 10, or even 15 years before needing to be fully replaced. To maximise the lifespan of your felt roof, be sure to regularly inspect its condition, and perform any repairs swiftly to avoid damage becoming worse.

Is Felt Roofing Waterproof?

Yes, roofing felt is highly waterproof thanks to its bituminous construction. This makes it incredibly effective at protecting structures such as garden outbuildings or garages from weather damage. However, felt roofs can be highly susceptible to issues such as cracks and splits, which can lead to leaks. This means it’s vital to keep on top of the condition of your felt roof to ensure nightmare leaks don’t take root and get out of hand.

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