How Do you Attach Purlins to Metal Trusses? For example, purlins should be placed eight feet from 2×4 struts and six feet away from 2×6 struts. Install the purlins on the rafters with a strong underlayment material for maximum support.Īdditionally, use struts to complement the purlins. So, you should support your purlins with rafters to prevent curving. How to Support Roofing PurlinsĪlthough purlins are support structures, they too must be supported to remain in place and perform their duties accordingly. You can achieve this by placing the purlins at the trusses’ nodes rather than on the members for even distribution and a straight roof. The purlins shouldn’t be placed close to each other to prevent the roof from bending or the shape from being distorted. You also want to ensure the purlins are spaced evenly to provide adequate support for the trusses. This means they are installed horizontally if the roof slopes at a 90-degree angle. Generally, most roofers arrange purlins depending on the roof slope. You can even overlap them during construction to build a more durable roofing frame. They come in the letter Z shape, with an inclination of less than 90 degrees, making them a wonderful choice for giving a roof shape and structure. You should go for Z-section purlins if you’re shopping strictly for roofing purlins. C-section purlins can span up to 20 feet and don’t require drilling. They are also good for supporting beams used in flooring and can be used as joists. They are primarily used to support walls and floors and help shape the section’s structure. Both are good styles if you use them in the right project.Ĭ purlins, also known as C-section purlins, have a C-shape. The names are based on the purlin shapes. The two main purlin styles are C purlins and Z purlins. However, they are more expensive, thus requiring a bigger budget. Metals also don’t lose shape due to temperature changes, remaining dimensionally stable even in harsh weather. The best one can last a lifetime with good maintenance. Metal purlins are lighter and more durable than wooden purlins. Most woods are also not resistant to pests. Unfortunately, timber is heavy and prone to rotting. Wooden purlins combine well with fiber cement sheeting, creating a breathable room that you can use for any purpose. They are typically made from hardwoods for strength and durability. Here’s what you need to know about each option. The two main materials used to make roofing purlins are wood and metal (steel). The following are the most popular options Types by Material There are many different types of roof purlins based on material and styles. Purlins allow you to extend this distance beyond the walls.
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