Slate roofing tiles have been in demand as they are durable, beautiful, and can be capable of enduring extreme weather. A proper slate roof can last over a century, which makes it an expensive, but excellent option for homeowners and contractors who want to invest money in a long-lasting place. That said, all slate tiles were not created equal and should be designed to have a long life. Good slate roof tiles should be discovered and determined in order to last long, be strong, and maintain finished gloss.
This article will guide you through the most important things to look at when choosing a good slate, where to find top-quality materials, and what to do when purchasing.
Key Characteristics of Good Slate Roof Tiles
1. Longevity and Durability
The best reason to use slate is the fact that it has such an extremely long life. Good slate tiles will easily last 75 to 100 years, and top-of-the-line types will last over 150 years. Slate durability is dependent on which minerals it's made of and where it is from. Tougher slates will be less weathered and softer types will deteriorate sooner.
For durability testing, look for slates with minimum water absorption (typically below 0.5%) and good breaking strength. This indicates they will remain solid against extreme weather, like freeze-thaw without cracking.
2. Thickness and Uniformity
Slate tiles are available in different thicknesses, typically between 4mm and 9mm for domestic use and 12mm for business use. Quality slates should be uniform in thickness across the tile because unevenly thick tiles will cause installation problems and early wear.
One rapid test is to pile a sample of tiles on top of one another. If the edges are rough and highly unlike in thickness, it could be a sign of a lower-quality batch.
3. Even Texture and Few Pyrite Inclusions
Quality slate will be flat, easy to handle, and have few pyrite inclusions (iron sulfide particles). Pyrite creates that golden speckled appearance but, if in great numbers, will eventually rust and stain.
To search for pyrite, put the tiles in sunlight. Small inclusions are fine but large, dense spots can mean lower-quality slate that will deteriorate more quickly.
4. Low Absorption and Weathering Resistance
Slate is resistant to water, though absorption depends on type and quality. The quality slate should have an absorption capacity of less than 0.5% since increased absorption causes delamination (peeling off of the layers), cracking, and moss or algae growth.
To test for water absorption, sprinkle water on the slate tile. If it absorbs the water readily rather than allowing the droplets of water to bead up, then the slate is of low quality.
5. Quarry Reputation and Place of Origin
Its origin affects the quality of slate. There are certain reputations on production by certain places depending on geological compositions of quarries.
Spanish slate – Highly utilized and rather strong and attractive.
Welsh slate – One of the more affordable prices of the finest slate manufacturers globally, Welsh slate is extremely durable with decent weatherproofing.
North American slate – Vermont, Pennsylvania, and Canadian quarries produce decent quality slates that function well.
Brazilian slate – Typically lower priced but will most likely soak up more water than a high-grade variety.
Since quality control conforms to local industry practices and standards, ensure the quarry is reputable and that it has appropriate certification when purchasing slate.
Where to Get Good Slate Roofing Tiles
1. From Quarries
Buying from quarries directly is one of the most assured means of ensuring authenticity and quality guarantee. Quarries enable customers to view the slate before making a purchase and provide certification to ensure the material is of industry standards.
Benefits:
Guaranteed quality
Direct pricing (lower price)
Option to buy custom size or color
2. Seasoned Slate Distributors and Suppliers
Reputable suppliers buy high-quality slate roof tiles from various quarries and typically provide grade certificates. Suppliers are known to the quarries, thus supply is guaranteed along with the uniformity in quality.
Pros:
More types of slate varieties available
Professional consultation on selecting right product
Quality inspection and warranty
3. Reclaimed and Salvaged Slate
For environmentally conscious homeowners, reclaimed slate is a perfect option. Tiles are rescued from destroyed old buildings and are more resilient because they have already weathered the test of time.
Advantages:
Greener and eco-friendly
Weathered, unique appearance
At times less expensive than newly made high-quality slates
When buying reclaimed slate, make sure that the tiles are level, not cracked, too delaminated, or worn out.
4. Roofing Contractors and Installers
Experienced roofers usually have professional contact who offers good-quality slate. You are advised to hire the services of a professional slate roofing contractor so that you may access the best material for your project.
Advantages:
Professional guidance by structure type and location
Good quality material access
Source and installation guidance
What to Consider When Purchasing Slate
1. Industry Certifications
Good quality slate should adhere to industry standards, e.g.:
ASTM C406 (North American slate) – Specifies quality grades (S1, S2, S3), of which S1 is the best.
CE Marking (European slate) – Ensures EU regulation compliance.
2. Warranty and Supplier Warranty
Good quality slate must come with a minimum 50-year manufacturer's guarantee, with luxury models providing a 100-year guarantee. Make sure the return policy of the supplier is established in the event of faulty or uneven tiles.
3. Sample Testing Prior to Bulk Purchase
Make an advance request for sample tiles to test color uniformity, thickness, and absorbency before finally placing an order. A small test installation spot can identify faults before it's installed on a grand scale.
Conclusion
Buying and procuring high-quality slate roofing tiles necessitates a scrutiny of durability, thickness, texture, water absorbency, and source. Quality slates should be durable against weather, should not contain impurities, and should be quality in source.
Buying from reputable quarries, seasoned suppliers, and knowledgeable contractors, owners can ensure that they are getting genuine, quality slate that brings value back to the property and maximizes the use of the property. Whether buying new or salvaged slate, the time spent on research and materials analysis will provide a long-lasting, stunning roof across generations.