What is the recommended fastening method for slate tiles?

The recommended fastening method for slate tiles involves using two copper nails for each tile. This approach provides optimal security and stability for the tiles, essential for withstanding wind and other environmental pressures that roofing systems often face. Copper nails are specifically chosen because of their durability and resistance to corrosion, ensuring that they will maintain their integrity over time without degrading the adjacent slate.

Using two nails establishes a secure anchoring point that helps to prevent movement and slipping of the tiles, which is critical in maintaining the overall integrity of the roof. The use of aluminum or steel nails might not provide the same level of corrosion resistance and long-term performance that copper offers, while gluing tiles in place can lead to issues with tile replacement and maintenance down the line. Therefore, fastening with two copper nails is recognized as the best practice for securing slate roofing materials effectively.