How to Felt a Shed Roof

If your shed roof has started leaking, lifting, or showing signs of wear, replacing the roofing felt is one of the best ways to protect it from further damage. Garden buildings are hugely popular across the UK too, with recent statistics showing that 87% of UK households have access to a garden or outdoor space, making shed maintenance more important than ever.

Learning how to felt a shed roof might sound difficult at first, but it’s actually a straightforward DIY job with the right preparation and materials. Roofing felt helps keep rain, damp, and cold weather away from the timber underneath, helping your shed last much longer. If you’re replacing old felt or fitting a brand-new roof, this guide will walk you through the full process step-by-step, including the tools you’ll need, common mistakes to avoid, and tips for getting a long-lasting finish.

What is Roofing Felt and Why is it Important?

Roofing felt is a waterproof material designed to protect shed roofs from moisture and weather damage. It’s usually made from bitumen-based material with a protective mineral finish on top. Once installed correctly, it creates a barrier that stops rainwater from soaking into the timber underneath.

Without roofing felt, shed roofs are far more vulnerable to rot, leaks, and damp. Even small gaps or worn patches can allow water to seep through over time, especially during heavy rain or freezing weather.

Good-quality roofing felt also helps improve the lifespan of your shed. While cheaper felt may only last a few years, thicker and better-quality products can provide protection for much longer with proper maintenance.

If you’ve noticed tears, bubbling, loose edges, or leaks inside your shed, it’s probably time to replace the felt.

Choosing the Best Roofing Felt for Your Shed

Before you start learning how to felt a shed roof, it’s important to choose the right material. Not all roofing felt is the same, and the quality you choose can make a big difference to durability.

Mineral felt is one of the most common choices for garden sheds. It has a textured surface that helps protect against UV damage and weather exposure. Polyester-backed felt is another popular option because it’s stronger and less likely to tear during installation.

Some people choose self-adhesive felt because it’s easier to apply, while heavier-duty felt is often preferred for larger sheds or workshops that need extra protection.

Although cheaper felt may seem tempting, many DIY guides recommend investing in thicker, stronger roofing felt where possible. Thin felt is more likely to rip, lift in strong winds, or wear out quickly.

Tools and Materials Needed to Felt a Shed Roof

Before starting, make sure you have everything ready. You’ll typically need:

• Roofing felt

• Clout nails or galvanised nails

• Hammer

• Stanley knife

• Measuring tape

• Bitumen adhesive

• Timber battens or roof trim

• Ladder

• Gloves and safety equipment

If you’re replacing old roofing felt, you may also need a scraper or pry bar to remove old nails and damaged material.

How to Prepare a Shed Roof Before Felting

Preparation is one of the most important parts of learning how to felt a shed roof properly. Rushing this stage can lead to problems later on.

Start by removing any old roofing felt from the roof surface. Pull out old nails and scrape away leftover adhesive so the roof deck is clean and smooth.

Once the roof is exposed, inspect the timber underneath carefully. If any sections are rotten, soft, or damaged by water, replace them before fitting new felt. Installing roofing felt over damaged timber will only shorten the lifespan of the roof.

Next, sweep away dirt, dust, and debris. The surface should be completely dry before you begin fitting the felt.

How to Felt a Shed Roof Step-by-Step

Now it’s time to install the roofing felt itself.

Begin by measuring the roof carefully and cutting the felt into manageable sections. Leave extra material around the edges so you have enough overlap for waterproofing.

When fitting felt to a shed roof, always start at the lowest edge of the roof and work upwards. This is important because it allows rainwater to run over the overlaps instead of underneath them.

Lay the first sheet of felt across the roof and pull it tight without overstretching it. Once positioned correctly, secure it using clout nails along the edges and timber supports underneath. Many DIY installers place nails roughly every 10cm for a secure hold.

Next, add the second layer of felt above the first, overlapping the previous sheet. The overlap helps prevent water from getting underneath the felt during bad weather.

For added protection, apply bitumen adhesive between overlapping sections before pressing them firmly together. This creates a stronger waterproof seal and reduces the chance of wind lifting the felt later on.

Continue repeating the process until the entire roof is covered.

Once the main sections are installed, secure the edges around the eaves and corners. Fold the felt neatly around corners rather than cutting too many separate pieces, as unnecessary cuts can increase the risk of leaks.

Finally, install timber battens or roof trim around exposed edges to hold everything securely in place and create a cleaner finish.

How to Felt Different Types of Shed Roofs

The process of how to felt a shed roof is similar across most shed styles, but there are a few differences depending on the roof shape.

Apex shed roofs usually require felt to overlap along the ridge at the top of the roof. Extra care should be taken here to prevent water getting into the centre join.

Pent shed roofs are slightly easier because they have one single slope. You still need to work from the lowest edge upwards to allow proper water runoff.

Flat shed roofs can be more challenging because water drains away more slowly. Proper overlap and sealing are especially important to stop standing water causing damage over time.

Common Mistakes to Avoid When Felting a Shed Roof

One of the biggest mistakes people make when learning how to felt a shed roof is using cheap or thin felt. Low-quality materials often fail much faster and may tear during installation.

Incorrect overlaps are another common issue. If felt layers are installed in the wrong direction, rainwater can work underneath the seams and cause leaks.

Overstretching the felt can also lead to problems. Roofing felt naturally expands and contracts with temperature changes, so pulling it too tightly may cause splitting later on.

Another mistake is not securing the edges properly. Loose edges are more likely to lift in strong winds, allowing water underneath the felt.

Finally, avoid fitting roofing felt during wet or windy weather whenever possible. Damp surfaces make adhesion harder and strong winds can make the material difficult to control safely.

How Long Does Shed Roof Felt Last?

The lifespan of roofing felt depends on the quality of the material, weather exposure, and how well it’s installed.

Cheaper felt may only last a few years before showing signs of wear, while thicker, higher-quality felt can last much longer when maintained properly.

Signs that your shed roof felt may need replacing include:

• Cracks or splits

• Loose edges

• Bubbling

• Water leaks inside the shed

• Visible sagging or lifting

Regular inspections can help spot small problems before they turn into larger repairs.

Conclusion: How to Felt a Shed Roof

In conclusion, learning how to felt a shed roof is a practical way to protect your garden building from leaks, damp, and weather damage. By choosing good-quality roofing felt, preparing the roof properly, and installing each layer with the correct overlaps and fixings, you can help extend the life of your shed by several years. Regular maintenance and inspections will also help keep your roof in good condition for years to come.

If you’re replacing worn felt or fitting a brand-new roof, taking the time to do the job properly makes a big difference to the durability and performance of your shed. If you’re looking for high-quality garden sheds built to handle UK weather conditions, explore the range available at Eden Sheds.

FAQs About How to Felt a Shed Roof

Can you felt over old roofing felt?

It’s usually better to remove old felt first. Installing new felt over damaged or uneven material can trap moisture underneath and shorten the lifespan of the new roof.

What is the best felt for a shed roof?

Mineral felt and polyester-backed felt are both popular choices because they offer good durability and weather protection.

How often should roofing felt be replaced?

This depends on the material quality and weather conditions, but many shed roofs need new felt every few years once signs of wear appear.

Can you felt a shed roof yourself?

Yes, many homeowners successfully learn how to felt a shed roof themselves using basic DIY tools and careful preparation.

Do you need adhesive for roofing felt?

Bitumen adhesive is recommended for overlapping sections because it helps create a stronger waterproof seal.