Where should joints between slate tiles ideally be staggered?

The best practice for staggering joints between slate tiles is to do so by 3 inches per course. This approach helps to enhance the overall stability and water-shedding capabilities of the roof. When joints are staggered, it reduces the likelihood of water penetration at the seams, as the overlapping tiles create a more robust barrier against moisture.

Additionally, staggering the joints by this measurement aligns with manufacturer recommendations and technical guidelines, ensuring that the installation adheres to industry standards. This offset creates a more visually appealing aesthetic as well, as it avoids creating a straight line that might be prone to cracking or water intrusion over time. Moreover, adequate staggering distributes the load more evenly across the structure, further bolstering the integrity of the roofing system.