What are the requirements for secondary emergency overflow drains or scuppers according to Section 1502.2?

Secondary emergency overflow drains or scuppers are required when the roof perimeter construction can trap water if primary drains fail. They must comply with Sections 1106 and 1108 of the International Plumbing Code for installation and sizing.

Secondary emergency overflow drains or scuppers are necessary when the roof perimeter construction is such that it could trap water if the primary drainage system fails. This requirement ensures that water does not accumulate excessively on the roof, which could lead to structural damage or failure. The installation and sizing of these secondary systems must adhere to the guidelines set forth in Sections 1106 and 1108 of the International Plumbing Code, ensuring they are capable of handling overflow effectively.