Clay and concrete roof tile must be installed on roof slopes of what minimum grade?

The correct answer indicates that clay and concrete roof tiles must be installed on a minimum slope of 2-1/2 units vertical in 12 units horizontal. This slope is necessary to ensure proper drainage of water and to minimize the risk of leaks and moisture accumulation beneath the roofing material. Tiles must be adequately pitched to allow rainwater to flow off and prevent pooling, which could lead to deterioration of the tiles or underlayment.

Roofs with this specific slope also help in maintaining the structural integrity of the tile installation. If the slope were lower, there could be a higher chance of water infiltration, which could compromise the roofing system's effectiveness. Additionally, adhering to the correct slope specification aligns with building codes and industry standards, ensuring that the installation meets safety and durability requirements.

Using a steeper or shallower slope than specified could result in operational issues, such as increased maintenance needs or failure of the roofing system. Therefore, understanding and following the correct specifications is crucial for the longevity and performance of clay and concrete roof tiles.