Purlin Roof Span

Live load is weight of furniture wind snow and more.

Purlin roof span.

Continuous purlin span are simply supported at each end and at a series of equally spaced intermediate supports. 1 in 25 4 mm. For outwards loads on equal continuous spans the bridging shown is required in the end spans. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap.

Cos of live load dead load x cos of the purlin spacing x purlin span squared 8 x sm section modulus of the member x duration of load 1 15 in areas with snowfall x cr repetitive member factor of 1 15 where members are 24 on center or less fb fiberstress required. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. All spans to have 1 row of bridging. Max roof span allowed 12m.

Need a quote or have a building project in mind. We have a large assortment of building materials that we can provide for your next project. Just give us a call or email and we can help you out with quantities and. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet.

They are available in galvanized and stainless steel and can be coated in zam and or prime painted. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. See gallery for more videos. Here are several useful tips for purlin installations.

Table top crane truck and utes. Roof purlins are used to support metal roofing panels. Cleated or bracketed fixing only no flange bolting. In this section you ll find sample calculations for determining wind and snow loads as well as c purlin and c girt weight tables.

Here is the formula for calculation of a roof purlin. Wall girts are used for the fastening of metal siding. High pressure zones kl 1 5 and 2 0 included. 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.

Tables are given for 5 or more spans. Dead load weight of structure and fixed loads 15 lbs ft2. 1 ft 0 3048 m. Roof purlins are used for fastening metal roof panels.

Tea gardens to kew and west to nowendoc. These tables are for spans in which purlins are lapped over each support where the lap length is 15 of the span. Cpe 0 9 and cpi 0 2. The safe spans below are suitable for sheds and class 1 structures with the following assumptions.

1 psf lbf ft2 47 88 n m2. In this section you ll find sample calculations for determining wind and snow loads as well as z purlin and z girt weight tables. C and z span load table. The heavier the load the purlins have to be installed in shorter distance between one another.

They are available in stainless steel or galvanized and can be prime painted and or coated in zam. However it is important to note that expected load is a crucial factor while determining this.