Fixings are the Achilles heel of timber buildings. Wind and other damaging hazards find the weakest link in the building, and failure will start there. This is almost always the fixings.
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The citing of AS/NZS 1170 Structural design actions in December 2008 introduced a number of changes to snow loading on buildings, and these have resulted in changes in NZS 3604.
NZS 3604:2011 will be cited later this year, so you need to know what the changes are.
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.
Changes to key Building Code documents dealing with building structure (B1) and weathertightness (E2) came into effect on 1 August 2011.
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.
Heavier windows and drained and vented wall cavities mean loadings from windows are often offset from the timber framing. Recent BRANZ research checked that a modified support bar system can transfer the load back to the framing to prevent problems.
Almost all building materials move of their own accord. This needs to be allowed for during design and construction or this movement can create problems with the durability of materials and, potentially, the building’s weathertightness.
Many Canterbury houses have lost stiffness and strength following the earthquakes. Repairs to gypsum plasterboard linings need to restore this to prevent future small events repeating the cracking and damage.