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.
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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.
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.