A purlin is a horizontal beam or bar used to support structural support in structures. It’s usually below the roof. Purlins can be supported by either the walls or the building’s roof rafters. These are used most often in steel buildings. However, it can also use them in wood-frame structures to replace tightly packed rafters. The purlins support the roof deck’s weight. The roof deck, made of a wooden panel, ply board, or sheet metal, creates the roof’s surface. Purlin is often filled with weatherproofing and made from concrete and insulation material.
There are many types and shapes of purlins, and they are divided according to the material they are made from and their form. Purlins can support floors or structural walls, and Purlin is essential because there is no roof structure.
What are Purlins?
Purlins are used to support roof deck loads or sheathing loads, and they can be supported by large rafters, building walls, steel beams, and other supporting structures. Purlins are more common than closely spaced and can be found in pre-engineered metal construction systems, the older post-and-beam, and the newer pole construction methods for frame construction.
Steel purlins can be used in place of traditional wood purlins. They are light, simple, accurate, lightweight, and stable in dimensions. They expand and contract slightly in extreme temperatures. Steel purlin is usually made from cold-formed material thin enough for the screws to pass through. By pressing or rolling thin steel sheets in cold-formed steel, it can be made into the desired shape. Cold-formed steel is cheaper than hot-rolled and, therefore, easier to work with. Although cold-formed steel can withstand more strain than hot-formed steel, it is more susceptible to cracking than being bent.
Purlins can be made from different metals. There are two types of purlins: one is made from simple Mild Steel with normal strength, and the other has zinc-coated with different GSM. Special coatings can be applied in extreme weather conditions to protect zinc coating.
Types of Cold-Formed Purlins or C Purlins
C Shaped Purlins
C purlins are formed in the C alphabet and are primarily used for supporting walls and floors. C section purlins (or cee section purlins) are used to create a building’s walls or floor joists. They can also be used for supporting flooring beams. You can also use our C-segment purlins for roof trimming, door mounting, window trimming, parapet, and side rails.
Our section C purlins have identical extensions at their ends. This means that they can be used in single spans. They are freestanding and sturdy, so they can be mounted easily while still providing stability in the system.
Sizes for C Purlins:
Bansal C-section purlins come in many thicknesses. They can be made to the customer’s exact specifications up to any length. This allows them to be modified to fit in different sizes of buildings easily. Bansal can also make them without drilling or with pre-drilled holes of different diameters. (Oval and round shapes are available upon request). Available web heights up to 300mm and thicknesses up to 3.2mm.
Z Shaped Purlin
A more potent form of Z purlin than C purlin can be used in conjunction at joints and overlaps. The horizontal beams are known as Z purlins or zed purlins, are used to form a building’s roof and wall joints. They are placed between the roofing sheet and the structure and act as a support for the sheets. Z purlins are a popular choice for agricultural and industrial buildings due to their lightweight and flexibility. They can be easily adapted to fit a wide range of sizes.
Sizes for Z Purlins
Bansal Roofing Products Ltd manufactures Z purlins in a wide range of thicknesses. We can produce any length that you require to meet your specific requirements. They can be manufactured with pre-drilled holes or undrilled, depending on your needs. On request, we can provide fixes in any shape or size—available web heights up to 300mm and web thicknesses up to 3.2mm.
C Shaped SIGMA purlins:
C-shaped purlins are made with special ribs (Bends on the web).
These purlins have superior structural properties to the other two types. These purlins can be used to form the walls and floor joists of a building shell. They are also suitable for supporting flooring beams. You can also use our C-segment purlins for door mounting, roof trimming, window trimming, parapet, and side rails.
Sizes for SIGMA Purlins Available:
The Bansal SIGMA Section Purlins come in many thicknesses. They can be made to your exact specifications up to any length. Bansal can also make them without drilling or with pre-drilled holes with different diameters. (On request, we can provide oval and round holes of any dimension). Available web heights up to 300mm and thicknesses up to 3.2mm.
What do Purlins Do in a Steel Building?
This is why it is essential to understand the basics of metal roof purlins. Purlins form an integral part of a pre-engineered steel package. These structural supports run perpendicularly through the rafter beams. Purlins, also known as “sheeting sheets,” provide the secondary framing for a steel building’s roofing. Metal roofing purlins provide three structural functions.
The purlins protect the roof. The purlins attach the rafters to the rigid frame, strengthening and stabilizing it. Purlins also provide support between the spans of individual framing bays. Purlins also increase resistance to excessive rain.
Purlins are Reliable Building Materials.
You can see the height of tall buildings almost reaching the heavens, as well as factories, warehouses, and apartments everywhere you go. The concrete jungle is now people’s backbone. It provides a place for everyone to relax, work, dine, or do other things. It is essential to understand how high-rise buildings and several hectares’ worth of warehouses were built with highly durable materials.
The wide range of materials on the market makes it easy to build factories and other facilities, as well as allows it to last longer. Purlin, among many other architectural materials, is one that can be used to support or help roof decks and sheathing.