Homes with skillion roofs8/10/2023 Trimdek: If the roof pitch is 5 degrees or less, then Trimdek is typically used as the shorter ribs and capillary grooves make for better water dispersal and a stronger roof. Standard skillion roofs are clad using custom orb. The engineering that would be needed to achieve a tiled skillion roof is technically possible, but the costs would be prohibitive. As metal cladding is much lighter than roof tiles, it’s also able to cope with large spans in a single direction. The trusses can be either steel or timber, but steel is generally preferable.Ĭustom orb: Metal roof cladding is required to achieve the falls required on a skillion roof. While the cost involved is higher than stick build, portal frame roof construction can deal with the larger spans and design complexity. Portal frame: When the skillion roof design is complex or large roof spans are called for, a portal frame system consisting of pre-assembled roof trusses is preferred. It means a roof carpenter will cut and assemble the roof timbers on site. Stick built: This method of construction is good for simple skillion roof structures. While box gutters are more generous than standard gutters, they still need to be carefully engineered to cope with both the volume and the speed of water coming off the roof, and this can invariably add more cost to your project. ![]() Guttering: A square, ‘boxier’ style of gutter is needed for a skillion roof as the single roof span typically means there’s a greater volume of water for the gutters to deal with when it rains. You still get the wow-factor, but it’s more cost-effective. Span: Using a number of skillion sections at different heights can be a good alternative to spanning a large home with a single super-sized skillion roof section. The NCC 2016 Building Code of Australia Volume II applies to roof framing (Part 3.4), roof cladding (Part 3.5.1) and gutters and downpipes (3.5.2), in conjunction with the relevant Australian Standards. ![]() It is possible to conceal services within bulkheads and dropped ceilings within rooms, but this is not always desirable if the aim is to create internal volume and sleek, clean lines. The restricted roof space means all services must be run before the ceilings are installed because the space is not readily accessible once everything has been completed. The best result is often a hybrid solution, with flat sections in bedrooms and passageways, where the design impact isn’t such a priority, keeping the raking ceilings for areas such as living rooms where you want to make more of a statement. While flattening out the ceiling below makes it easier to include services, you lose the design impact that comes with a raking ceiling. Mirroring the slope of the roof with raking ceilings inside the home compounds the issue. Providing services such as air-conditioning and plumbing within a skillion roof can be not only challenging, but also more expensive compared to a traditional pitched or hip roof. Roof space is more limited with a skillion roof, simply because the volume of internal space reduces as you get to the lower end of the slope. While a home featuring a single skillion roof can certainly stand out from the crowd, the large and complex homes built by Oswald will often feature multiple skillion roof sections. ![]() The roof is often hidden behind a parapet wall or façade so all you see from the street are clean square lines. What we often think of as a flat roof is also classed as a skillion as it’s usually a single span set at a very low pitch that allows for water run-off. ![]() Curved roofs also fall within the skillion roof category, but due to their high cost they usually only feature on large architectural homes. It features two sloping planes angled downwards in opposing directions to give the impression of ‘wings’. Unlike a traditional hip or pitched roof, which has at least two sides, or planes, the skillion roof’s single plane typically slopes down from one side of the house to the other.Ī butterfly roof is a variation of the skillion roof. Sometimes known as a mono-pitched, monoplane, pent or lean-to roof, the skillion roof has even been unglamorously referred to as a ‘shed roof’. While it’s usually best suited to contemporary and modern designs because of its ability to bring volume inside and out, you can also spot skillion roof shapes in industrial-inspired designs and in Mid-Century Modern homes taking inspiration from the classic Californian bungalow. Ranging from spectacular sweeps and curves, to almost-flat, a skillion roof is essentially a single-sided roof that can become a design feature in its own right.
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