Pipe Installation
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Lesson on pipe installation.
Covering the following: Responsibilities and Requirements, Installing Pipework, Electrical Safety and Pipe Insulation
Where to lay pipework and access
Pipework may be installed:
- in a roof space
- under a timber floor
- below a concrete slab (BRANZ does not recommend within slab installation).
Where pipes are buried, they must have:
- 600 mm cover under trafficked areas
- 450 mm cover under lawns and garden areas (non-trafficked)
Where pipes are under concrete, they must have 50-year durability.
Where pipes cross other services below ground, they must comply with the details shown in the following diagram.

Access for maintenance and replacement
Pipes installed in locations that are difficult to access should:
- have a detailed durability statement for 50-year service from the manufacturer
- if passing through a structural element, be sleeved in a larger pipe that is open at both ends to allow the pipe to be inspected or replaced if necessary
- be installed in a chase or duct which will provide ready access and will not compromise structural elements.
Inquiry questions