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