Nzs 3604 Roof Framing

Nzs 3604 is new zealand s most sought after standard. The rafter span is 3 000 m and because this is a light roof the far right column of nzs 3604 2011 table 10 1 rafters for all wind zones see figure 2 can be used for rafter spacings at 1200 mm see note 4 in table 10 1. It is aligned with as nzs 1170 structural design actions and is referenced in acceptable solution for building code clause e2 external moisture e2 as1.

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Nzs 3604 2011 includes provisions for their use.

Nzs 3604 roof framing. Roof truss information was in the commentary in the 1999 standard making it informative. The 2011 revision of nzs 3604 allowed an increase in the maximum verge cantilever distance from 600 mm to 750 mm and also introduced an addi tional higher wind zone eh. Nzs 3604 is a core resource for building consent authorities determining compliance with the nzbc and gives guidance to builders and others involved in the construction of light timber framed buildings. Nzs 3604 1999 incorporating amendment no.

However finding the requirements for rafter fixings in skillion roofs or for hip and valley rafters is a little more circuitous. Print timber framed buildings. In the previous version of nzs 3604 purlin tables provided for extra fixings around roof edges and ridges reflecting the greater wind uplift in these areas. 10 1 11 the building envelope wall and roof claddings.

Finding fixing requirements for rafters in couple close roof construction is fairly straightforward in nzs 3604 2011 section 10 roof framing. 10 roof framing 11 building envelope roof and wall claddings 12 interior linings 13 ceilings additional information normative. Current the latest up to date edition. Builders architects engineers designers and students will find it useful.

Very little area was often left as the body of the roof and it proved unrealistic to expect designers and installers to determine when and where extra fixings were required. It provides methods and details that are used to design many nz timber framed houses and small buildings including many residential decks. Previous versions of nzs 3604 put most of the emphasis on close coupled roof framing design and construction and left nail plated roof trusses to the realm of specific engineering design. It s therefore important that the industry is clear on the limits and fixing requirements for cantilever verges see figure 1.

Nzs 3604 is used to design most homes and other low rise timber framed buildings in new zealand. 1 and 2 new zealand standard timber framed buildings superseding nzs 3604 1990 and nzmp 3600 part 1 1992. You can follow nzs 3604 for structure and e2 as1 for the roof and wall claddings. The standard is also an important teaching resource for tertiary and trade training organisations.