– a type of truss that uses diagonal members in tension and vertical ones in compression. Since most of these roof trusses are used to provide horizontal stability and to carry the load of the entire roof, we can focus on showcasing five main types of roof trusses: Pratt truss There can be many different metal roof truss types, depending on either specific elements of the structure or the overall geometry of the metal roof truss as a whole. Timber, on the other hand, can only be recycled if it is clean, while painted, stained or contaminated timber elements are not usable in terms of recycling whatsoever. Steel as a whole is a completely recyclable material, and that also includes steel roof trusses. RecyclabilityĪnd last, but not least, is the recyclability of these materials. However, steel is also easier to deliver and install due to its prefabrication ability. Steel can be somewhat more difficult to install as a whole when compared with timber, although a professional installation team is capable of reducing that difference to a minimum. At the same time, timber has more resistance to fire and heat in general, and steel is resistant to both rot and insect infestations. Vulnerabilitiesīoth steel and timber have their own vulnerabilities as materials, with timber being susceptible to rot and insect infestations and steel being affected by high temperatures. Steel’s strength-to-weight ratio is far higher than wood, as well. Steel as a material is far more durable than timber in any of its forms, and a steel roof truss is expected to last from 50 to 70 years with little to no maintenance, while the maximum possible time of life for a timber truss is 30 years. Unlike steel trusses, timber is more suitable for various residential buildings of relatively small size, such as family warehouses, single-family homes, and more. Designated house types, strength and lifetime Alternatively, timber has always been rather cheap as a material, but it is also influenced by a lot of different factors that can drastically increase the price of a regular timber roof truss on short notice. Priceįor example, while steel itself was often deemed rather expensive, the existing manufacturing techniques evolve on a regular basis, making steel less and less expensive on a regular basis. It would be easy to list all of the advantages and disadvantages of a steel roof truss as a structure type, but it is also possible to do the same by comparing a steel roof truss to its main competitor – a wood(timber) roof truss. Steel roof installation is usually offered by the same companies that produce these structural elements in the first place – creating steel roof trusses in semi-assembled form, delivering them on-site, and then putting everything together.Īdvantages and shortcomings of steel roof trusses Steel roof trusses are working by the same logic as most steel structures – they are purchased as a finished product, in accordance with all of the necessary design choices and modifications. At the same time, steel roof trusses are relatively common in various wide-span structures, including supermarkets, hangars, warehouses, and so on. Another use case for steel roof trusses is all about cases that deal with roof rebuilding efforts – especially when a flat roof is transformed into a pitched one.Ī lightweight steel structure is great for these cases since it does not put too much of a strain on the existing building structure – walls, ceilings, and so on. A steel roof truss is the #1 option for buildings and other structure types that are already based on steel frames. Steel turned out to be a surprisingly good alternative to timber, which is why it is now a great alternative to timber in several different situations. While it is the most popular material for a roof structure, it is not the only possible option on the market. The most traditional rafter framing/roof structure out there is the one made with timber, since it is both the oldest and the most popular steel roof material by far. Rafter framing is one of the most important parts of any building out there.
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