What are the layers typically found in a flat roof assembly?

A flat roof assembly typically consists of several key layers, each serving a specific function that contributes to the overall performance of the roofing system. The correct answer highlights the common layers found in this type of assembly, which include a wear course, drainage layer, and roofing membrane.

The wear course is the top surface layer that protects the underlying components from UV rays, weathering, and physical damage. It can also provide additional traction if the roof is accessible for maintenance or use.

The drainage layer is critical for ensuring proper water runoff. This layer facilitates the movement of water that may collect on the roof, directing it to drainage points to prevent pooling and potential damage.

The roofing membrane is the waterproof layer that acts as a barrier against moisture. This membrane is essential for maintaining the integrity of the building, as it prevents water infiltration that could lead to leaks and damage to the structure below.

These layers work together to create a robust and effective flat roof assembly that addresses both the protection and functionality required in modern building design.