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The roof is usually the first thing to fail when a building is damaged in a severe storm. This risk can be minimised by making sure there are good structural connections.
Good roof system design is a critical part of a good building. A roof designer must consider cost, performance and appearance, but it’s important to keep a few other factors in mind.
The 6.3 magnitude earthquake that struck Christchurch on 22 February 2011 and the many aftershocks have been an enormous test of the performance of buildings. BRANZ Structural engineers provide some initial thoughts on how houses performed.
The treated timber framing system that came into effect on 4 April this year allows a single hazard class, H1.2, to be used for all enclosed radiata pine and Douglas fir framing.