Steel Roof Purlin Span

Cpe 0 9 and cpi 0 2.

Steel roof purlin span.

Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Safe roof purlins spans. 20 psf x 949 1 5 psf x 12 x 949 x 11 625 2 8 x 3 0625 x 1 15 x 1 15 972 75 psi.

For sake of discussion we will assume a minimal roof snow load of 20 psf pounds per square foot and a 4 12 roof slope. 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. As per as1684 and as4055 spanman adopts a nett pressure coefficient applied along the full length of the purlin of cpn 2 0 for non cyclonic zones n1 to n6 and cpn 2 5 for cyclonic zones c1 to c4.

02 6554 6422 email. Max roof span allowed 12m. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. Purlins are installed horizontally under metal roofs.

All spans to have 1 row of bridging. They are available in galvanized and stainless steel and can be coated in zam and or prime painted. Engineered purlin metal mart offers a complete line of engineered purlin material. The safe spans below are suitable for sheds and class 1 structures with the following assumptions.

If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. In this section you ll find sample calculations for determining wind and snow loads as well as z purlin and z girt weight tables. High pressure zones kl 1 5 and 2 0 included. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm.

29 norfolk close tuncurry nsw 2428 phone. Spacing is typically 24 on center in low snow loads and is reduced based upon truss span and snow load. For 2x4s purlins the posts are spaced in 4 feet distance. Roof purlins are used for fastening metal roof panels.

For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. C and z span load table. Dead load will be the actual weight of the roof steel and the roof purlins. Cleated or bracketed fixing only no flange bolting.