Designing a domestic plumbing system - Build 169(2018)
- Designing a domestic plumbing system
- Valid from
- Information provider
- BRANZ Limited
- Information type
- BUILD article
- HTML, PDF, Hard copy
Considering the key requirements of a plumbing system early in a house design can lead to a smoother consenting and building experience, fewer call-backs and happier clients.
When BRANZ arranged inspections of 200 new houses under construction, some of the most common problems involved plumbing. In over a third of the houses, there were framing cut-outs to accommodate pipes that were larger than permitted in NZS 3604:2011 Timber-framed buildings.
Cladding penetrations for pipes that were not properly sealed to the wall underlay – a potential weathertightness risk – were also among the top 10 defects.
This article includes:
- Plan well to avoid problems
- Basic requirements
- Design and planning pointers
- Think about the water supply layout
- Gradients and floor joist depth
- Floor waste gully traps
- Drainage, sanitary plumbing and venting a 2-storey house
- Include maintenance access
- Plan the work sequence