Under what condition are clay tile roofs an effective shedding style roof on their own?

Clay tile roofs are an effective shedding style roof primarily when installed on steep slopes, specifically those greater than a 4 in 12 pitch. This configuration is crucial because the design of clay tiles relies heavily on gravity to effectively shed water and debris. On steep slopes, rainwater quickly drains off, reducing the likelihood of water pooling and minimizing the potential for leaks. The orientation enables the tiles to overlap properly, making it more efficient at keeping the underlying structure dry.

When clay tiles are placed on shallow slopes or flat surfaces, their ability to shed water diminishes significantly. In these scenarios, water can accumulate, leading to possible leaks and water damage over time. Therefore, the steep slope is essential for ensuring the longevity and performance of clay tile roofing systems, making it the ideal condition for their use.