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 purlin span tables.
Purlin load tables simple span capacities 1.
20 95 30 d c a b variable angle 18 x 22 holes 34 x 10 recess upturned lip z sections standard z the following diagrams and tables illustrate the sizes and thicknesses readily available for.
They are available in galvanized and stainless steel and can be coated in zam and or prime painted.
Capacities listed in the fully braced column are the allowable load for cases where the compression.
Roof purlins are used for fastening metal roof panels.
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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.
Span tables for purlin supporting rafters to bs 5268 7 6 imposed loads of 0 75 kn m snow load are applicable to most areas where the altitude does not exceed 100 metres refer to bs 6399 3 imposed loads of 1 kn m snow load are applicable to most areas where the altitude exceeds 100 metres but does not exceed 200 metres but excluding parts of scotland pennines north east england refer to bs 6399 3.
For 2x6s purlins the posts are spaced in 6 feet distance.
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These span tables are to be used for structures that fall within the definition of open buildings i e.
Here is the formula for calculation of a roof purlin.
Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.
C and z span load table.
By the standard the most used placement of purlin span for metal roof is five foot intervals.
Z purlin and girt section properties.
Capacities are total uniformly distributed load which can be supported by the section in the absence of axial load.
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.
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Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins.
Two or more sides open roof cladding adjacent to an open side to be at least 500mm from adjacent building or boundary.
The weight of the section has not been subtracted from these values.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
The c section can be supplied as a standard configuration or with the top flange bent to suit the roof slope.
For 2x4s purlins the posts are spaced in 4 feet distance.
Non cyclonic area these span tables are for use in non cyclonic areas as defined by as 1170 2 2011 connections.
