Master Plumbers September FAQ: Do you know the answers?

When installing a hot water service where is lagging required?

• The minimum requirement for lagging on pipe work and associated valves as per 3500.4 are:
• The inlet and outlet pipes, including valves, for a storage water heater, for at least the first 500 mm or, where an external heat trap is fitted, to a point 150 mm down the heat trap vertical leg closest to the water heater.
• All relief valves fitted directly to a storage water heater.
• The primary flow and return pipes, including valves, between an auxiliary heater and a storage water heater.
• All vent pipes to 300 mm above the maximum operating water level of the heated water system.
• On multiple installations, the whole heated water manifold, including valves, to a point at least 500 mm past the heated water outlet branch from the last water heater.
• On a solar water heater installation, the pipework between a solar pre-heater and an in-line supplementary water heater.

The insulation installed in accordance with the above shall be installed so as not to impede the operation of the valves.

When is safety mesh required?

As HB39 states:

Safety mesh is to be fitted in roof construction under plastic roof cladding materials for Class 1 and Class 10, and Class 2 and Class 9 buildings, as defined in the NCC. Safety mesh can also be used a fall protection. Whenever work is to be carried out within 2 m of any edge on a new or existing roof from which any person could fall, provision is to be made to prevent persons falling in accordance with the relevant regulations, codes of practice and guidance material on fall protection that have been developed and or adopted in each State and Territory in conjunction with appropriate edge and perimeter protection. One of the preferred systems for protection against injury through falling in the sheet laying process is the provision of a permanent wire safety mesh over the area to be roofed. Safety mesh installed beneath metallic roof coverings is a common installation fall protection measure only. For installation of safety mesh refer to HB39 or for information again AS 1562.1.