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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?
There have long been questions about whether a single gable end truss is suitable for fixing cladding to and, if so, what is the maximum height before a 2-ply gable end truss is required? For the answer, we look at the design of gable end trusses.
Proprietary wall bracing systems are commonly used to brace a building, but how are braced walls connected to a concrete slab? We look at both NZS 3604:2011 and proprietary wall bracing elements requirements.
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.
Calls to the BRANZ Helpline indicate that there is still confusion about the correct use of bottom plate anchors with concrete floor slabs.
The larger shank diameter of fixings used to fix weatherboards over a cavity can cause splitting. One way to get around this problem is to fix timber cavity battens directly to the structural framing.
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.
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.
External timber steps can feel a bit wobbly or springy, especially as they get wider. We review the design rules and offer some ideas for building strong stairs.
