Required size for a given span.
Span tables roof purlin spacing australia.
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.
Cleated or bracketed fixing only no flange bolting.
They have been generated using the latest version of the purlin and girt software developed by the centre for advanced structural engineering at the university of sydney and cover the full range of stratco z and c sections from 75mm through to 400mm depth.
From span table c the maximum allowable single span is 2160mm.
Step 4 assume the wind classification for the area is n1 and the roofing profile is stramit corrugated cladding 0 48mm bmt thickness in a single span configuration.
High pressure zones kl 1 5 and 2 0 included.
All spans to have 1 row of bridging.
Sizes stramit top hat th64 series th96 series stramit battens 3 97mm approx 36mm 64mm 22mm stramit top hat th64075 th64100 th64120 stramit cyclonic roof batten stramit roof batten stramit ceiling.
Cpe 0 9 and cpi 0 2.
Use recommended minimum roof pitches as specified by roof sheet supplier.
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The tables include a comprehensive range of span configurations.
Reading off the empty under table with h 5m hc 2 5m span table c will be used to determine the spans.
If the space between posts is greater than 8 feet then brace is needed to avoid buckling.
Flat roof span tables allow for a maximum roof pitch of 5ยบ.
Posts these span tables are designed for a minimum post size of 50 x 50 x 2 5mm up to a maximum height of 3 0m.
Spacing should be interpreted as the centre to centre distance between adjacent parallel members.
Spantec has prepared these tables for use by people skilled in the design and specification of the.
Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
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.
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.
Safe roof purlins spans.
The safe spans below are suitable for sheds and class 1 structures with the following assumptions.
For 2x4s purlins the posts are spaced in 4 feet distance.
Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins.
Max roof span allowed 12m.
If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.
