How to Lay Roof Tiles

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Laying roof tiles correctly is a crucial part of constructing or refurbishing a weatherproof roof. Roof tiles not only protect a property from rain, wind, and snow but also play a vital role in its thermal performance, ventilation, and overall appearance. Whether you are repairing a small section of roof or undertaking a full retiling project, understanding how to lay roof tiles properly ensures durability, compliance with Building Regulations, and a professional finish that enhances your home’s value and longevity.

In the UK, roof tiling must meet specific standards under the Building Regulations and the BS 5534: Code of Practice for Slating and Tiling. These guidelines ensure tiles are fixed securely, laid with correct overlap, and able to withstand the country’s diverse weather conditions. This detailed guide explains how to lay roof tiles step by step, covering preparation, materials, alignment, and the key technical considerations that make a tiled roof both attractive and long-lasting.

Understanding Roof Tiling

Roof tiles are designed to overlap each other in a way that channels rainwater away from the roof surface and into the guttering system. They can be made from clay, concrete, or slate, each offering distinct aesthetic and performance characteristics. Clay tiles are traditional and durable, concrete tiles are versatile and affordable, while slate provides a premium, natural appearance.

The structure of a tiled roof typically consists of rafters, a layer of underlay or roofing felt, battens fixed horizontally across the rafters, and the tiles themselves, which are secured to the battens. The underlay provides a secondary weather barrier, while the battens create fixing points for the tiles and ensure even spacing and alignment.

Preparing the Roof

Before laying roof tiles, preparation is essential to ensure the surface is structurally sound and properly aligned. Begin by inspecting the rafters for any damage, rot, or warping. Any structural defects must be repaired before work begins.

Next, install the roofing underlay or felt. This acts as a moisture barrier that prevents wind-driven rain or condensation from penetrating into the roof void. The underlay should be laid horizontally from the eaves upwards, with each course overlapping the previous one by at least 100mm. It should also drape slightly between rafters to allow water to run down into the gutter without pooling.

Secure the underlay with corrosion-resistant staples or nails, ensuring it is taut and free from creases. At the eaves, use an eaves support tray to direct any water safely into the gutter and protect the felt from UV damage.

Once the underlay is in place, fix the battens. These are typically 25mm x 50mm treated timber strips nailed horizontally to the rafters. The spacing between battens, known as the batten gauge, depends on the size and type of tile being used and must be calculated accurately to ensure proper overlap.

Calculating the Batten Gauge

To determine the correct batten spacing, refer to the manufacturer’s specifications for the tile. The calculation is based on the tile’s headlap—the distance by which one tile overlaps the next in the course below. For example, if the tile length is 420mm and the headlap is 100mm, the batten spacing would be 320mm.

Batten gauges must be consistent across the roof to maintain even rows and ensure watertight coverage. Use a chalk line to mark batten positions before fixing them with galvanised nails.

Setting Out the Roof

Before laying tiles, establish the layout to ensure symmetry and proper alignment. Start by marking the centre line of the roof and setting out the tile courses from this point. It is good practice to dry lay a few rows of tiles at the eaves and verge to check that the spacing and alignment are correct.

If necessary, adjust the verge or eaves course slightly to avoid awkward cuts or narrow tile sections. Roof tiling should always look balanced, with equal margins on both sides of the ridge.

Laying the First Course

Begin at the eaves, where the lowest course of tiles is installed. Eaves tiles or eaves courses often require cutting to ensure correct overlap and alignment with the second course. These tiles should overhang the fascia board slightly to allow water to drip into the gutter.

Fix the tiles to the battens using the manufacturer’s recommended fixings—typically galvanised nails or clips. Each tile should sit securely against the batten without rocking or lifting. Ensure the alignment is perfectly straight along the eaves before continuing.

Continuing the Main Tiling

Once the eaves course is complete, continue laying tiles up the roof in overlapping rows. Each tile should overlap the one below by the specified headlap and interlock with adjacent tiles to create a continuous, weatherproof surface.

Work from the bottom up, alternating between left and right sides to maintain even progress. Regularly check alignment using a chalk line or string to ensure rows remain straight.

At verges (the roof edges), use purpose-made verge tiles or neatly cut standard tiles to maintain a clean, uniform finish. Verge tiles must be securely fixed to resist wind uplift, often with mechanical clips or mortar bedding depending on the design.

Fixing at the Ridge and Hips

The ridge and hip sections of the roof require special attention, as these areas are particularly exposed to wind and rain. Traditionally, ridge tiles were bedded and pointed with mortar, but modern practice increasingly favours dry ridge systems that use mechanical fixings and breathable membranes.

Dry ridge systems provide superior ventilation and require less maintenance, as they eliminate the risk of mortar cracking over time. The ridge tiles are fixed over a ridge roll or vent strip, which allows airflow beneath while maintaining a watertight seal.

For hip sections, similar dry hip systems are available, or alternatively, hip tiles can be bedded with mortar. Ensure that all ridge and hip tiles are securely fastened in accordance with BS 5534 requirements for wind uplift resistance.

Cutting and Detailing

Tile cutting is sometimes necessary around roof features such as chimneys, vents, and valleys. Use a mechanical tile cutter or angle grinder fitted with a diamond blade for clean, accurate cuts. Always wear protective goggles and gloves when cutting tiles.

At valleys, where two roof slopes meet, use valley troughs or lead linings to channel rainwater safely down to the gutter. Tiles should be trimmed to fit neatly along the valley edges, with consistent spacing to ensure proper drainage.

Around chimneys or dormer windows, install lead flashing to seal joints and prevent water ingress. Flashings should extend under the tiles above and over them below, creating a shingle effect that directs water away from vulnerable areas.

Ventilation and Breathability

Modern roof design places great importance on ventilation to prevent condensation and maintain timber integrity. The combination of underlay, battens, and tiles must allow adequate airflow between the roof space and the outside.

Ventilated ridge systems, eaves vents, and breather membranes all contribute to maintaining a healthy roof environment. When fitting roof tiles, ensure ventilation components are installed according to manufacturer specifications and Building Regulations Part C (Resistance to Moisture).

Safety Considerations

Roofing work involves significant safety risks. Always use properly secured scaffolding and edge protection, and never work on a wet or icy roof. Footwear with good grip and appropriate fall protection equipment are essential.

When lifting tiles, avoid carrying excessive loads and use mechanical lifts where possible. Handling tiles with care also prevents cracking and damage to the surface finish.

If the roof is steep or complex, or if you are unfamiliar with roofing techniques, hiring a professional roofer ensures compliance with safety and quality standards.

Compliance with Building Regulations

In the UK, roof tiling must comply with Building Regulations Part A (Structure), Part C (Moisture Resistance), and Part L (Energy Efficiency). The work should also adhere to BS 5534, which outlines requirements for fixing, battening, and underlay performance.

If retiling more than 25% of the roof, you must notify your local authority’s Building Control department. They will check that insulation, ventilation, and materials meet current standards. Upon completion, a Building Control completion certificate will confirm compliance.

It is also important to check whether your home is in a conservation area or covered by listed building consent, as these properties often have restrictions on materials and appearance. In such cases, natural slate or specific clay tiles may be required.

Common Mistakes to Avoid

One of the most common errors in roof tiling is incorrect overlap. Too little headlap allows water ingress, while too much increases weight and reduces ventilation.

Failing to use the right fixings can lead to tiles slipping or lifting during strong winds. Every tile must be fixed according to manufacturer guidance and local wind exposure zones.

Neglecting ventilation is another frequent issue, leading to condensation and potential timber decay. Always ensure eaves and ridge vents are correctly installed.

Finally, avoid mixing tiles from different manufacturers, as variations in profile and size can affect alignment and weatherproofing.

Maintaining a Tiled Roof

Once installed, a tiled roof requires minimal maintenance, but regular inspections are vital to catch potential issues early. Check for cracked or missing tiles, damaged flashings, or blocked gutters at least once a year and after severe weather.

Moss or lichen growth can be cleaned carefully using soft brushes or professional cleaning products. Avoid pressure washing, which can damage tiles and underlay.

Promptly replacing damaged tiles prevents water from penetrating the roof structure and causing further deterioration. With proper care, clay and concrete tiles can last 50 years or more, while natural slate often exceeds 100 years.

When to Hire a Professional

While small repairs or single-tile replacements can be tackled by skilled DIYers, laying an entire roof is a complex and labour-intensive task that requires precision and knowledge of regulations. Professional roofers bring the expertise to ensure the roof is safe, compliant, and built to last.

They can also advise on suitable materials, insulation requirements, and local planning considerations. Before hiring, always verify that the roofer is qualified, insured, and experienced in the type of roof you are working on.

Conclusion

Learning how to lay roof tiles is an invaluable skill for understanding how roofs protect and define a property. From preparing the underlay and battens to aligning and fixing each tile, attention to detail is essential for both appearance and performance.

By following correct techniques and ensuring compliance with UK Building Regulations, you can achieve a roof that is both functional and long-lasting. Whether you carry out the work yourself or hire professionals, investing time and care into proper tiling ensures a safe, durable, and attractive result that enhances your home for decades to come.

To explore the next useful guide, the Remote Control Help Guidance hub is a good place to continue. You might also find how to slate a roof and how to make a green roof helpful next, depending on what you are working on.