How Long Do Slate Roofs Last?
Slate is one of the most popular choices for roofing in the UK, and it is not hard to see why - it is extremely durable, energy-efficient, and aesthetically pleasing, but it is its longevity which makes it stand out from the crowd.
Many historical and famous buildings use slate roofing, such as 10 Downing Street in London which uses one of the most desirable slates in the world, Welsh slate. At Empire Roofing, we are highly experienced at working with slate to repair slate roofs and install new roofs, such as at The Old Rectory, Cirencester, and Barbury Shooting School. In this article, we’ll explore everything you need to know about the popular roofing material!
Why Is Slate a Popular Choice?
Slate is a particularly durable material for your roof, lasting much longer than most other roofing materials. It's particularly resistant to periods of poor weather, including heavy rain, snow, and wind, and it absorbs very little water compared to porous tiles. As a natural stone, slate is fire resistant, providing excellent protection in case of fire hazards. Slate is also an energy-efficient option for residential and commercial properties, as it acts as a natural layer of insulation, keeping homes cool in the summer and warm in the winter.
How Long Does a Slate Roof Last?
The lifespan of a slate roof largely depends on how well the roof is installed, and the type of slate you choose. Typically, a slate roof can last anywhere between 50 to 200 years, meaning it could well be the only roof you will ever need!
Hard slates such as Welsh slate or Spanish slate will usually last over 100 years, but when maintained and cared for properly, can last up to 200 years! Softer slates, such as Chinese slate, will still last you a respectable amount of time, typically spanning between 50 to 100 years.
To gain an accurate estimation of a slate roof’s quality, it’s best to consult an expert since the installation quality affects how long a slate roof will last. For the best, long-lasting investment, consult a reputable and experienced roofing team, such as Empire Roofing. We’ll ensure your slate roof is fitted professionally to stand the test of time, repelling whatever poor weather is thrown its way.
How Do Other Roofing Materials Compare?
If you’re wondering how long other well-maintained materials can last in comparison with slate, we’ve come up with an estimate for each:
- Asphalt Shingles: 15 to 30 years
- Cedar Shingles: 25 to 50 years
- Lead: 60 to 100 years
- Clay Tile: 50 to 100 years
- EPDM Rubber Flat Roof: 25 to 30 years
- GRP Flat Roof: 30 to 50 years
- Single Ply Membranes: 25 to 40 years
- Concrete Tile: 30 to 60 years
- Metal: 40 and 70 years
Pros and Cons of Slate Roofing
Benefits of Slate Roofs
Long-lasting
Slate roofs are among the most durable roofing options available, capable of withstanding the most severe weather conditions typical in the UK. The high-quality slate tiles we use at Empire Roofing, such as Welsh and Spanish, have an average lifespan of 100 years and beyond.
Traditional and Iconic Aesthetic
Slate roofs have been used for centuries, providing a classic and traditional appearance for your home. Highly sought after in Oxfordshire and throughout the UK, they can significantly enhance your property's value, compared to other roofing types.
Low Maintenance
Slate is among the lowest maintenance roofing options due to its durability, resistance to scratches and damage, and its ability to repel moss and moisture, as it is non-porous. However, we still recommend periodic roof maintenance to check for any potential damage to the slate tiles over time, as these should be replaced quickly if damage has occurred.
Fire Resistant
Natural slate is among the most heat-resistant roofing materials available. This means it won't catch fire or spread flames in the event of a fire, regardless of whether it originates inside or outside your home.
Energy Efficient
Slate's density gives it excellent insulating properties, helping to keep your home cool in the summer and warm in the winter. This not only enhances the value of your property but also reduces your energy costs.
Eco-Friendly and Recyclable
Natural slate is an eco-friendly roofing option, as it is sustainable and can be easily recycled in the future.
Disadvantages of Slate Roofs
Heavy
Slate roofing is quite heavy, which can require additional structural support during installation. This added weight may not be suitable for all types of buildings, particularly those not designed to handle it.
Expensive
Slate roofs are among the most expensive roofing options due to the high cost of materials and labour required, but with a high price comes high quality. The upfront investment can be significantly higher than other roofing materials.
Can Be Brittle Under Direct Impact
While slate is durable, it can be brittle and prone to cracking or breaking under direct impact, such as from heavy hail or falling branches. This brittleness may require careful maintenance and attention to avoid damage.
What Are the Best Types of Slate for Roofing?
For those who are struggling to decide what slate to go with, take a look at some of these long-lasting, attractive options:
- Welsh Slate is considered one of the best roofing slates in the world due to its consistency, strength, and resistance to weathering. Commonly available in deep blues, purples, and greys, Welsh slate can last 150 to 200 years or more.
- Spanish Slate is widely used in the UK due to its affordability and durability, usually lasting around 100 years. Spanish slate is generally darker, in shades of grey and black with some greenish tones. Almost 80% of the world’s roofing slate comes from Spain!
- Brazilian Slate is an affordable and versatile option for households looking for a new roof, available in a wide range of colours such as green, black, grey, and rust tones. Manufactured using mudstone, Brazilian slate typically lasts between 50 to 100 years.
- Cornish Slate has been used on traditional and heritage buildings for hundreds of years, valued for its rustic charm, natural appearance, and longevity. Sourced from the Delabole quarry in North Cornwall, Cornish slate roofs will usually last over 100 years.
- Canadian Slate is a solid choice for many households, particularly admired for its high strength and high durability. Notably coming from the Quebec region of Canada, Canadian slate is typically darker and will last between 75 to 100 years (or more!).
How Can I Increase the Longevity of My Slate Roof?
There are several ways that you can help your slate roof last even longer, including:
- Conducting regular roof inspections, particularly following intense weather.
- Ensuring the roof is installed by an experienced professional, such as Empire Roofing.
- Address any maintenance issues with the roof promptly to prevent escalating damage.
- Ensure that metal flashing around weak points, such as chimneys, is in good condition.
- Keep your roof clean, removing any moss, algae, or debris to avoid moisture buildup.
- Ensure that your loft is well-ventilated to prevent heat and moisture from building up.
How Can I Tell When My Slate Roof Needs Replacing?
Despite their incredible longevity, even the very best slate roofs will eventually need replacing. If you’re concerned about when this may be, there are some telling signs to watch out for that might indicate your slate has served its lifespan. These include:
- Broken or Missing Slates: Cracked, missing, or delaminating slates indicate damage. Fortunately, unlike many types of roofing, individual slate tiles can be replaced if broken, without needing to replace the whole roof.
- Slate Shedding: Excessive debris or slate fragments in gutters suggest the slates are wearing out.
- Sagging Roof: Visible sagging, especially around ridges or valleys, points to structural problems needing attention.
- Leaks or Water Damage: Persistent leaks or water stains may indicate a failing roof, especially if the flashing is damaged.
- Moss, Mould, or Algae Growth: Trapped moisture can lead to decay. Regular cleaning may help, but widespread growth is a concern.
- Discolouration or Fading: Excessive fading or discolouration, especially in low-quality slate, may signal deterioration.
For Professionally Installed Slate Roofs That Stand the Test of Time, Choose Empire Roofing
At Empire Roofing, we’re proud to work with the highest quality slate products for use in your new roof, such as premium grade, including Welsh and Spanish slate. We ensure that every installation is compliant with British Standards and professionally handled so that your roofing investment is well-spent, standing strong even in the worst of the British weather. For more information about our services, please contact us today.