There has been a recent trend for council RFIs and requests from specifiers around threshold detailing vs surface water drainage, with confusion around the separation of their functions. Threshold drainage and surface water drainage are designed to perform two different tasks. Here I outline some of the commonly queried situations.

There are a range of approaches to how a low-pitched roof can be designed, it could include an internal gutter and/or drain into a rainwater head and the lowest point, or through a traditional roof drain outlet. 

NZ made solutions provide a premium finish and achieve the level of detail specified for projects such as luxury hotels in Auckland. Elements such as the integration with other systems, performance and the ability to customise are core features when selecting for tile floor shower channels.

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.

Consideration should be taken to futureproofing new developments to ensure surface water drainage is efficient and will prevent unnecessary flood damage to property. Our cities are becoming increasingly less permeable with a higher coverage of hard surfaces as they intensify.

A look at the various ways of approaching roof and balcony drainage on high density residential projects.