Galvanized steel can often be identified by its ‘spangle’, a crystalized pattern on its surface. Galvanizing coats the steel in zinc which protects the steel from harsh environments and corrosion. After the forming of the steel it is then dipped in molten zinc in a process known as galvanizing. Cold-formed steel is stronger than hot-formed steel and easier to work with. As opposed to working with hot metal, cold-formed steel is made by rolling and pressing thin sheets of steel into the desired shape. Steel purlins are typically made from cold-formed steel. These are all weaknesses of wooden purlins, and ones which can seriously hinder the structural integrity of the roof and, indeed, of the structure itself. Unlike wood, steel purlins will not rot, they are not affected by water and moisture, and their expansion and contraction in different climates is minimal. We’ll discuss the different purlin shapes in a moment, but when it comes to material there’s no question that steel purlins are the preferred choice by the construction industry. Purlins take on a number of forms and are typically classified according to their shape, the material they are made of, and their intended use. How many purlins a roof has, and the thickness or depth varies depending on the loadings for that building. Purlins are essentially necessary components for a quality building regardless of whether your structure is made from wood, steel, or some other material, purlins are a critical part of any structure’s roof. This helps to diffuse the weight of a building’s roof across the entire surface and to multiple components of the building, rather than having the majority of the roof’s load be concentrated on just the walls, just the rafters, etc. While it can vary from structure to structure, purlins typically help spread the load of a roof to other structural elements like building walls, rafters, or metal support beams. In other words, they support the weight of the metal sheeting, plyboard, wooden panels, and other materials that comprise the surface of a roof, and anything else that might be built up on top of a roof ( e.g., snow, water, building accessories, etc.). Understanding whether your building requires purlins, what material they should be made of, and what shape they should take, are all questions you should have the answer to before building a new structure – so let’s dive in! What are Purlins?įound in most large structures, purlins are the horizontal beams that provide structural support to a building by helping to pass roof loads to other major structural elements. Proper structural integrity and load support is key to the longevity of a building, and to the safety of a building’s occupants. This article will help you understand the role purlins play in the integrity of your steel building structure, so you can make a more informed purchasing decision for your next building. They are an important part of most building structures and are a mark of quality when it comes to steel building structures. A crucial component of most building structures, purlins are what – literally – keep the roof over your head. The answer to this question, of course, is the title of this blog: purlins. Have you ever looked up at the interior of a steel structure and wondered: “what are those bars supporting the roof called?” Well, if you have, then you’ve come to the right article to find your answer.
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