What is the minimum slope required for a coal tar built-up roof?

The minimum slope required for a coal tar built-up roof is 1/8:12. This slope is specified to ensure proper drainage of water from the roof surface, which is critical in preventing water accumulation and potential leakage. A slope of 1/8:12 helps facilitate water runoff, thereby reducing the likelihood of water pooling that could undermine the integrity of the roofing materials over time. Ensuring the correct slope also contributes to the overall durability and longevity of the roof system, as it minimizes the risks associated with standing water, such as increased weight loads and deterioration of roofing materials.

In contrast, slopes that are too steep can complicate installation and increase the material costs, while those that are too shallow may not provide adequate drainage, leading to issues that could compromise the roof's effectiveness. Thus, the specific requirement of 1/8:12 strikes a balance between functionality and practicality in roofing applications.