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. They increase roof spans: Roof span is the distance from one end of the roof to the other.Support the weight of the roof deck: Purlins help spread the weight of the roof decking to enhance balance through the structure.Support roof sheeting or decking: The main purpose of purlins in standard roofs is to support the sheeting or decking material.Roofing purlins perform several roles on the roof, which explains why they are an ever-present feature in most roofs. Then several purlins run across the rafters, holding them together and providing the surface for roof sheeting. You need at least two, one at each end, for a rectangular or square room, though many projects require several trusses to form the shape of the roof. Two rafters, each running from the opposite side of the house or room, typically meet at the apex of the room and are held together by ceiling joists or rafter ties, forming a basic truss. Meanwhile, purlins run horizontal or parallel to the ridge. Rafters are members of the roofing structure that run perpendicularly from the top of the walls to the roof ridge. Walls and rafters, in turn, support the purlins. The term purlin in steel constructions refers to roofing framing members that span parallel to the building’s eave, supporting the roof decking or sheeting. Read on to learn the different types of roofing purlins, what they do, and how to properly install and space your purlins for the highest impact. You should consider closer purlin spacing for greater roof strength if you’re building in a location prone to heavy snow loads or high winds. When positioned, the distance between one roof purlin to the next should be no more than 1.2 meters when using 0.7 mm-thick sheeting and 1.0 meters when using 0.5mm-thick sheeting. So the big question is, how far apart should purlins be for a metal roof? However, to get maximum value from your purlins, you must select the right purlin material and style and install them correctly. Purlins can also protect the roof decking from being blown away by strong winds. They add valuable support and improve building stability by distributing the weight of the roof decking. I plan on ordering materials for delivery next week.Purlins are critical when installing a metal roof. I’d just as soon as go with the 1x3 strapping and call it good, but with limited building experience thought I bounce it off you guys and see what you had to say, done, and experienced. I’ll have a steam hood eventually and will pipe it into the cupola, but that won’t be until after next season the earliest, likely the season after that. Apparently OSB is better than it used to be, but not sure how it would stand up to all the evaporated water. ![]() ![]() The alternative would be to use some sort of plywood (OSB, plywood, Advantech) which is a lot more money ranging from $160 (OSB) to $300 (plywood and Advantech). ![]() To use strapping it would cost approximate $60 for the whole roof. Not sure if the condensation concerns were due to evaporator liquid condensing on the roof or if temperature differences between inside and outside were the concern (like glass of cold water on a humid day) or both. I was thinking of going with 1x3 strapping at 16” o.c., but talking with someone they mentioned concerns with condensation and walking on the roof. I’m going with a metal roof and looking at supporting materials for the metal roof. Getting ready to put a roof on my 14x22 sugar house and am ordering materials.
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