Steel Roof Purlin Design

Max roof span allowed 12m.

Steel roof purlin design. In structural steel or aluminum construction p urlins usually w shapes or channels transfer roof loads to the major structural elements supporting the roof. Safe roof purlins spans. Next and the last video of this series will be on. Purlins are installed horizontally under metal roofs.

The safe spans below are suitable for sheds and class 1 structures with the following assumptions. Cleated or bracketed fixing only no flange bolting. Cee purlins are secondary steel framing members most commonly used as roof purlins wall girts and header jamb and sill for windows and doors on metal buildings. The shape of cee purlins does not allow end lapping they are butted together.

Purlins are 2 by 4 feet and are installed much like metal roofing. Steel z purlins and z girts are also available with other depths and flange widths. High pressure zones kl 1 5 and 2 0 included. Welded together they can be used as columns braces and ties.

They give added support to the roof and also provide a nailing surface for the end panels and drip edge. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Only design of purlin is explained in this video in a very simple way. We manufacture any component from 1 2 steel subgirts to 12 section up to 10 gauge.

In timber construction purlins are nailed to the rafter or supporting trusses while in steel roof construction they are welded or bolted to the rafters or trusses by the means of cleats. All spans to have 1 row of bridging. Purlins are 2 by 4 feet and are installed much like metal roofing. To watch how to calculate the load on purlin then plss watch this video.

Contact flexospan for information on custom purlin and girt structural steel dimensions. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. The topic we want to discuss today is the purlin installation. Roof purlin are members used to directly support roof sheeting materials and could be made of timber or steel.

Available in cee or zee shape red oxide primed or galvanized 16 14 or 12 gauge sizes from 4 up to 12 flange widths of 1 1 2 up to 4 cut to your specified lengths hole punching available load tables available for all material. Steel roof purlins and wall girts are produced and available in house. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Cpe 0 9 and cpi 0 2.

Engineered purlin metal mart offers a complete line of engineered purlin material. The type and spacing of purlins is a design consideration which depends upon the incident roof loads as well as the limiting lengths of sheeting to be used.