Steel Purlin Roof Design

Purlins are 2 by 4 feet and are installed much like metal roofing.

Steel purlin roof design.

Purlins are installed horizontally under metal roofs. Purlins and girts are used longitudinally to support the roof sheeting which they were originally designed for. In a structural steel shed the main portal frames and roof rafters are made from strong steel sections which are welded together and later bolted together. They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

Contact flexospan for information on custom purlin and girt structural steel dimensions. 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. Steel z purlins and z girts are also available with other depths and flange widths. Steel roof purlins and wall girts are produced and available in house.

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. Purlins traditionally support the roof deck cladding sheeting and are in turn supported by the principal rafters steel beams etc. Metal roof purlins are installed horizontally under metal roofs. 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.

We manufacture any component from 1 2 steel subgirts to 12 section up to 10 gauge. In structural steel or aluminum construction p urlins usually w shapes or channels transfer roof loads to the major structural elements supporting the roof. Engineered purlin metal mart offers a complete line of engineered purlin material. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Purlins are 2 by 4 feet and are installed much like metal roofing. The shape of cee purlins does not allow end lapping they are butted together. In the past the majority of roof structures were of wooden construction but over the past 15 to 20 years there has been a vast shift away from wood to metal mainly steel roof construction.

Roof purlin are members used to directly support roof sheeting materials and could be made of timber or steel. Welded together they can be used as columns braces and ties.