What size should roof purlins be?

What size should roof purlins be?

Purlins are typically anywhere from 4” up to 12” with a flange width of 1-½” up to 4”. They are available in a variety of custom sizes and lengths depending upon what a project requires.

How far can you span metal purlins?

A four-inch purlin can span 12 feet. A six-inch purlin can span 18 feet. An eight-inch purlin can span 25 feet. A ten-inch purlin can span 30 feet.

What is the difference between C and Z purlins?

C purlins are built to shape a building’s shell structure walls and floor joists, whereas Z purlins are built to shape a building’s shell structure’s roof and wall joists.

How far apart should the purlins be on a metal roof?

The purlin are ultimately used to fasten the roof steel providing a diaphragm effect, along with the siding, when properly engineered and installed. Spacing is typically 24″ on center in low snow loads and is reduced based upon truss span and snow load.

What does Z purlin look like?

Z purlins resemble the shape of a letter “Z” and are also referred to as Zee or Zed purlins. They are roof framing members that span parallel to the building eave and support the roof decking or sheeting. The metal purlins are in turn supported by rafters or walls.

How far apart should roof purlins be for a metal roof?

What are metal roofing purlins?

Designed to reduce the distance the rafters have to span, metal purlins support the loads from the roof deck and help to prevent the roof from sagging. Western States Metal Roofing offers two types of galvanized purlins:

What are Z purlins and how do they work?

Z purlins or zed purlins are horizontal beams that are designed to form the roof and wall joists of a building shell structure (also view our C section purlins page). They sit between the roofing sheets and the building, acting as a support for the sheet to ensure it is firmly attached and safely in place. Our Z purlins are most…

What are the different types of galvanized purlins?

Western States Metal Roofing offers two types of galvanized purlins: C Purlin – Cee or C purlins are shaped like a squared-off letter C. They are often used for structural support in walls and as floor joists in addition to roofs. Z Purlin – The zee or Z purlin is shaped like a letter Z.

What material are purlins made of?

All purlins and girts are manufactured from high tensile, G450, G500 or G550 galvanised steel, with a minimum Z350 coating. Purlins can be used as structural steel in light weight buildings, but must be used in accordance with a design certified by an engineer.