BU509 Sizing gutters and downpipes
- Abbreviation
- BU509(2009)
- Valid from
- 1/04/2009
- Information provider
- BRANZ Limited
- Information type
- BRANZ Bulletin
- Format
Description
This bulletin provides an overview of safely disposing of stormwater from buildings through the most common method of gutters and downpipes.
Scope
This bulletin covers:
- statutory requirements
- rainfall intensity
- roof plane area
- roof slope
- flow capacity
- gutter falls
- position of bends
- location and design of outlets
- downpipes
- external and internal gutters.