This is a question that often gets asked. There are a number of options, and your product selection will depend on a few factors.

When designing a compliant level threshold system we have to cover off all the requirements of Chapter 7.3.2.1 of E2/AS1.

Waste water in processing facilities such as factories for food and beverage production, or even commercial kitchens, can often present unique requirements on the drainage systems.

In a membrane roof design, the overflow should have the same cross-sectional capacity as the primary outlet and give an early conspicuous warning to the building occupier that maintenance is required. But what about the weeping overflow, or one that activates prematurely?

When selecting passive fire and drainage systems, early engagement to select the right solution can have a profound effect.