Strong wind causes damage to houses, particularly their roofs. A recent BRANZ study started by defining ‘extreme winds’ before developing retrofit solutions to ensure roofs on older houses are adequately secured.
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Securing roofs against wind uplift is a crucial step in the building process. Fortunately the cost of doing so adds very little to the overall cost of the building.
Roof failures in high winds are unfortunately too common in timber-framed buildings, but get the connections right, and the roof should stay put.
Most timber trusses are delivered to site as one-piece building components. However, occasionally they are delivered in sections and must be joined on site. Correct installation of these is critical to maintain the designed load paths.
The area around the edge of a roof requires extra fixings to stop it lifting, but how much of the total roof area needs these extra fixings?
Not only is technology changing building design, it’s changing product development. Build talks to Dave Stampa, National Manager for Steel & Tube Roofing, about the process involved in the development of their latest roofing profile.
Roof bracing is one element in a continuum that provides resistance to horizontal loads. It works with the wall and foundation bracing to supply a total bracing package for a building.
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 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.
They deliver substantial environmental gains, so while New Zealand is slow to jump on the green roof bandwagon, there’s reason to think this will change.
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