stick built rafter spacing for metal roof

Stick built rafter spacing for metal roof how to#

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. 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.

Stick built rafter spacing for metal roof how to#

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. Purlins are critical when installing a metal roof.