BC Update: No.64 - Changes to Building Code Clauses E2, F4, F6 and G13/G14
6 July 2007: Several unrelated changes to Building Code Clauses came into effect on 21 June.
E2 External Moisture
The changes make weathertightness requirements clearer. It is now clear that building elements close to the ground, and not only those in contact with the ground, must not absorb water likely to cause damage or dampness. Wall cavities now need to be constructed to prevent fungal growth as well as condensation and degradation. The Clause also now requires designers to consider material variability and the way in which construction occurs so that weathertightness problems are prevented.
F4 Safety from Falling
The Clause now bans safety barriers that can be readily used as seats in public places.
F6, formerly Lighting for Emergency, now Visibility in Escape Routes
The Clause has been completely re-written to make New Zealand building users safer in emergencies. It strengthens and clarifies the requirements for occupant safety in emergencies in line with international best practice. The Clause now allows the use of the latest way-finding systems – photoluminescent strips, directional markings and light emitting diode strips – as well as normal emergency lights. Way-finding systems have seen major technological advances in recent years and are becoming increasingly used overseas.
For example, New York City now requires the use of mixed emergency lighting and way-finding systems because of the September 11 terrorist attacks.
Under the new Clause, there must be enough visibility in the building when the main lights fail to help evacuation and to avoid panic. The amendments mean building elements (stairs, doors, etc.) will need to be visible from 10 metres in an emergency.
G13 Foul Water and G14 Industrial Liquid Waste
Several minor technical updates have been made to the Clauses, clarifying the performance requirements for on-site disposal of foul water (septic tank systems) and the storage, treatment and disposal of industrial liquid waste.
The details of the changes and the updated Clauses are available on the Department’s website.