Tables are given for 5 or more spans.
Purlin roof span.
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1 psf lbf ft2 47 88 n m2.
The safe spans below are suitable for sheds and class 1 structures with the following assumptions.
High pressure zones kl 1 5 and 2 0 included.
Tea gardens to kew and west to nowendoc.
Live load is weight of furniture wind snow and more.
Table top crane truck and utes.
The heavier the load the purlins have to be installed in shorter distance between one another.
Cpe 0 9 and cpi 0 2.
By the standard the most used placement of purlin span for metal roof is five foot intervals.
For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap.
Here are several useful tips for purlin installations.
We have a large assortment of building materials that we can provide for your next project.
Dead load weight of structure and fixed loads 15 lbs ft2.
Wall girts are used for the fastening of metal siding.
They are available in stainless steel or galvanized and can be prime painted and or coated in zam.
Continuous purlin span are simply supported at each end and at a series of equally spaced intermediate supports.
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.
Max roof span allowed 12m.
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For outwards loads on equal continuous spans the bridging shown is required in the end spans.
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Live load 20 lbs ft2 956 n m2 maximum span ft in nominal size.
C and z span load table.
Safe roof purlins spans.
These tables are for spans in which purlins are lapped over each support where the lap length is 15 of the span.
All spans to have 1 row of bridging.
1 ft 0 3048 m.
However it is important to note that expected load is a crucial factor while determining this.
They are available in galvanized and stainless steel and can be coated in zam and or prime painted.
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.
In this section you ll find sample calculations for determining wind and snow loads as well as z purlin and z girt weight tables.
Roof purlins are used for fastening metal roof panels.
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.
1 in 25 4 mm.
The typical spacing standards for residential and commercial buildings are about 1 to 2 foot.
Cleated or bracketed fixing only no flange bolting.
