Choosing Your Shed Roofing Materials
Putting a roof on a shed involves selecting the right material to ensure longevity and protection against the elements. The primary function is to repel water, but aesthetics, budget, and ease of installation also play significant roles. Understanding the different options available will help you make an informed decision for your garden structure.
Felt roofing, often referred to as shed felt or roofing felt, is a traditional and budget-friendly choice. Typically made from bitumen-saturated felt, it's designed to be laid in overlapping strips, creating a waterproof membrane. It’s relatively simple to install, making it a popular option for straightforward shed roof designs, especially for smaller structures. However, its lifespan can be shorter compared to other materials, often requiring replacement every 5-10 years depending on quality and climate.
Asphalt Shingles
Asphalt shingles offer a more durable and visually appealing alternative. Available in a wide array of colours and styles, including those designed to mimic slate or wood, they provide excellent waterproofing. Shingles are installed in overlapping rows, starting from the eaves and working upwards, creating a robust barrier. While slightly more complex to fit than felt, they generally offer a longer service life, typically 15-30 years. Many homeowners opt for shingles to match their main house roof or to enhance the garden room ideas aesthetic.
EPDM Rubber Roofing
For a more modern and exceptionally long-lasting solution, EPDM (Ethylene Propylene Diene Monomer) rubber roofing is a strong contender. This synthetic rubber membrane is highly durable, flexible, and resistant to UV rays, extreme temperatures, and hail. EPDM is typically installed as a single, seamless sheet, drastically reducing the risk of leaks. It requires careful fitting, often using specialised adhesives, but its lifespan can extend beyond 30 years, making it a low-maintenance, high-performance option for various shed base ideas.
Corrugated Sheets (Metal or Plastic)
Corrugated sheets, whether made from galvanised steel, aluminium, or tough plastic (like polycarbonate or PVC), offer a robust and straightforward roofing solution. They are known for their strength, resistance to rot and pests, and relatively quick installation. The corrugations provide structural integrity and aid in water runoff. Metal sheets can be prone to rust if the protective coating is damaged, while plastic sheets may become brittle over time due to UV exposure. These are particularly suitable for workshops or more utilitarian garden shed installation projects.
The decision often comes down to balancing cost, the desired aesthetic, the complexity of the shed’s roofline, and how long you expect the roof to last before needing attention. For a basic garden shed, felt might suffice, while a premium garden room would benefit from shingles or EPDM.
Select a roofing material that can withstand your local weather conditions, whether that involves heavy rain, strong winds, or intense sun exposure.
Key Considerations for Material Choice:
- Durability & Lifespan: How long do you need the roof to last?
- Cost: What is your budget for materials and potential labour?
- Ease of Installation: Are you undertaking a DIY project, and how experienced are you?
- Aesthetics: Does it need to match your house or complement your garden design?
- Weight: Ensure the shed's structure can support the chosen material, especially in snowy regions.
Preparing Your Shed for a New Roof
Before you can begin putting a roof on your shed, thorough preparation of the existing structure is crucial. A sound base ensures the new roofing material will perform as intended and last its expected lifespan. This phase often involves assessing the current roof deck, ensuring it is structurally sound and free from damage.
Assessing and Repairing the Roof Deck
Inspect the existing roof deck – this is the underlying surface (usually plywood or OSB boards) that supports the roofing material. Look for any signs of rot, water damage, or sagging. If damage is found, the affected sections must be cut out and replaced with new, sound timber. Ensure the new timber matches the thickness of the original for structural integrity. If the existing deck is sound but has an old layer of felt, you may be able to apply the new material directly over it, provided the old felt is not excessively wrinkled or damaged. However, for best results and longevity, removing old roofing material is often recommended.
Ensuring a Sound Shed Base
While we are focusing on the roof, it’s worth noting that a solid foundation is paramount for the entire shed structure. If you are building a new shed or significantly refurbishing an old one, consider building a suitable shed base. Options include concrete slabs, paving slabs laid on a bed of sand and gravel, or timber sub-frames. A well-constructed shed base prevents the shed from settling unevenly, which can put undue stress on the roof structure and lead to premature failure. For existing sheds, ensure the walls are plumb and the top wall plates are level before commencing any roofing work.
Understanding Roof Pitch and Overhang
The pitch, or angle, of your shed roof is critical for effective water drainage. Most standard garden sheds have a simple single-slope (pent) or apex roof design. Ensure there is sufficient slope to allow water to run off quickly and efficiently into gutters or away from the shed. An overhang, where the roof extends beyond the walls, is also important. This protects the shed’s walls from rain and weather, preventing water from running down the sides. The width of this overhang will influence how much material you need and how it is cut and secured at the edges.
Proper preparation prevents headaches later. A well-prepared deck and a sturdy structure are the foundation for a successful roof installation.
Taking the time to prepare your shed's structure properly is the most critical step in ensuring a durable and leak-free roof installation.
Tools and Safety Gear Required:
- Measuring tape
- Utility knife or heavy-duty scissors
- Hammer and galvanised roofing nails or staples
- Caulking gun with appropriate sealant (e.g., bitumen-based adhesive for felt)
- Pry bar (for removing old roofing)
- Safety gloves
- Safety glasses
- Sturdy ladder, secured appropriately
- Work boots
Installing Your Chosen Shed Roofing
The method for putting a roof on a shed varies significantly depending on the material you've chosen. Each type requires a specific approach to ensure proper overlap, secure fastening, and effective waterproofing. Always consult the manufacturer’s specific installation instructions for your chosen product, as these will provide precise details.
Installing Shed Felt
Start at the lower edge (eaves) of the roof. Unroll the felt, allowing it to overhang the edges by about 50mm. Secure the felt along the edge with galvanised nails or staples every 100-150mm. Roll the felt up towards the ridge, ensuring each new strip overlaps the previous one by at least 100mm. Apply a suitable adhesive or bitumen mastic along the overlap before laying the next strip to create a waterproof seal. At the ridge, the final piece of felt should overlap the felt from the opposite side. Any felt overhanging the gable ends should be trimmed neatly or folded over the edge and secured.
Fitting Asphalt Shingles
Begin by installing a starter strip of shingles along the eaves, with the tabs facing upwards. Then, lay the first full course of shingles, ensuring they overlap the starter strip and extend slightly over the fascia board. Subsequent courses are laid in a staggered pattern, with each shingle overlapping the one below it and the vertical joints offset from the row beneath. This staggering is crucial for preventing water ingress. Use galvanised roofing nails, ensuring they are driven through the designated nailing strip and are long enough to penetrate the roof deck but not poke through the underside. Seal any edges and valleys with appropriate roofing cement or sealant as needed. Ridge cap shingles are applied last to cover the peak.
Applying EPDM Rubber Roofing
EPDM installation is typically done with a full adhesive bond or a 'torch-on' method (though less common for DIY due to safety). For adhesive application, the roof deck must be clean and dry. A specialised EPDM adhesive is applied to both the deck and the underside of the EPDM membrane. Once the adhesive is tacky, the membrane is carefully laid into place, ensuring no wrinkles or air bubbles are trapped. Edges and seams are sealed using seam tape and lap sealant. The EPDM should be trimmed to size, allowing for sufficient overlap at the eaves and gables, and secured with appropriate trim or flashing.
Fixing Corrugated Sheets
Corrugated sheets are fixed to the roof structure using specialised screws with rubber washers, which create a watertight seal at each fixing point. Start laying the sheets from one side, typically the prevailing wind direction, so that the overlap sheds water away from the wind. Each sheet should overlap the one beneath it by at least one corrugation (or more, depending on the pitch), and adjacent sheets should overlap by one corrugation or more along their length. Fix the screws through the crests of the corrugations, not the valleys, to prevent water pooling. Ensure fixings are at appropriate intervals as recommended by the manufacturer.
Always ensure sufficient overlap between roofing elements, whether it's felt strips, shingles, or corrugated sheets, to prevent water penetration.
Regardless of the material, proper flashing around any vents, chimneys, or where the roof meets a wall (if applicable) is vital. This ensures a watertight seal in these critical transition areas.
Tips for a Professional Finish and Long-Term Care
Achieving a professional finish when putting a roof on a shed involves attention to detail, particularly around the edges and any penetrations. Proper care and maintenance thereafter will ensure your new roof provides reliable protection for many years.
Finishing Touches and Weatherproofing
Pay close attention to the eaves, ridges, and verges. Drip edges made of metal or UPVC can be installed along the eaves and gable ends before the main roofing material is laid. These direct water away from the fascia and bargeboards, preventing rot. Where the roof meets a wall (for attached sheds), or around any protrusions like vents, use appropriate flashing. This usually involves metal or rubber sheeting carefully integrated with both the roofing material and the adjacent surface to create a watertight seal. Use a high-quality, weather-resistant sealant designed for exterior use on any joints or gaps.
Ventilation and Gutters
Proper ventilation can prevent moisture build-up inside the shed, which can lead to condensation, mould, and rot. Consider installing small vents near the eaves or ridge, especially if your shed is used for storing sensitive items or if it is a larger garden room. For many sheds, adding a guttering system is a worthwhile investment. Gutters collect rainwater runoff from the roof, directing it away from the shed's foundations, preventing soil erosion and dampness around the base. This water can often be channelled into a water butt for garden use.
Maintenance Schedule
Regular inspection and maintenance are key to extending the life of your shed roof. At least twice a year, ideally in spring and autumn, clear any accumulated debris such as leaves, moss, or twigs from the roof surface and out of gutters. Check for any signs of damage, such as cracked or missing shingles, tears in felt, or loose fixings on corrugated sheets. Promptly repair any minor issues before they escalate into larger, more costly problems. If you have used asphalt shingles, inspect them for signs of granule loss, which can indicate wear.
Consider the aesthetic of your shed’s roof. For example, if you’ve opted for a darker roof covering, you might want to explore garden shed paint colours for the walls that complement it, creating a cohesive look. Remember that different roofing materials might require different cleaning methods; consult the manufacturer's guidelines.
Alternatives for Shed Roofing
While the above covers common methods, alternative approaches exist. Some people opt for living roofs on smaller structures, though this requires significant structural reinforcement and ongoing maintenance. Other unique options include salvaged materials, such as old tiles or slates, provided the shed structure can support the weight and the installation is done correctly to ensure waterproofing. For many, however, the goal is a blend of practicality and resilience that the standard roofing options provide. If you are considering a larger structure, such as a garden room, you might explore options similar to house roofing, like standing seam metal or premium shingles, for superior longevity and aesthetics.
Inspect your shed roof after any severe weather events, such as strong winds or heavy snowfall, and address any visible damage immediately.