Internal gutters and flow capacity - Build 175(2019)
- Abbreviation
- Internal gutters and flow capacity
- Valid from
- 1/12/2019
- Information provider
- BRANZ Limited
- Information type
- BUILD article
- Format
- Website, PDF
Description
If an internal gutter that provides drainage from a metal roof overflows, the only place the water can go is into the building below. This is not only inconvenient but can cause damage. How can these problems be avoided?
The best way to prevent problems with internal gutters is to avoid them. However, this is not always possible, so where required, internal gutters must be designed and built with care.
Scope
This article includes:
- Building Code compliance
- Some alternative methods available
- Specific requirements of E2/AS1
- Calculate rainfall intensity
- Size gutters using roof plane and pitch
- Size downpipes
- Downpipes and overflows