![]() This type of purlin is typically installed with a hidden clip and the rafters are welded to it on site, creating one durable unit! Welded Rafter Purlins – If you want something that is durable and easy-to-install, then welded rafter purlins could be your best choice. Each has their own benefits, but it is important to understand the differences between them when you choose your system!ġ. There are three different types of metal purlins and rafters. Rafter Distance Details The Types Of Metal Roof Purlins & Rafters For very long spans, it is recommended that one end post every 200 feet (60.96m) be fitted with a bearing plate to support the purlins.In case the roof spans over 50 feet(15.24m), then the purlins should be designed in pairs by using a single higher purlin at the center of the span to support two lower purlins spaced 30 inches (762mm) apart.In this case it’s advisable to use additional purlins. If the number of purlins used in a span is more than 5, then the center-to-center spacing should not exceed 30 inches (762mm).Good judgment should be used when spacing metal roof purlins for long spans on light-frame construction. “Metal purlins shall not be more than 30 inches (762mm) on center when supporting steel framing and 38 inches(965.8mm) when carrying sheathing only”. Many building codes and metal roof purlin manufacturers recommend the following: However, this can be customized depending on what you need! The standard distance for most buildings ranges from 12″ up to 24″. In general, the larger and heavier a metal roofing structure is, the more space it needs between rafters or purlins! The spacing of metal roof purlins is another important detail that you need to consider before choosing your system. There are many things to consider when you choose your spacing and distance, and we will go through them in this post! The Spacing Of Metal Roof Purlins One of the main components of this type of system is the purlins and rafters. A metal roofing system is a great choice for any building that needs protection from the elements.
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