Vdes(serv.) = 28m/s Vdes(ult.) = 50m/s

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mm Help
The member length measured from the centre of its left support to the centre of its right support
mm Maximise
Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. 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. A consulting engineer familiar with the above codes should be contacted by the user should clarification be required with regards to the user's specific protect.
Note: Tick this box if the purlin is a distance "a" from a roof edge or a change in roof slope
"a" is the minimum of the building height, 0.2 of the building width or 0.2 of the building depth.
Modify manual load Help
Please select your roof compostion here. Note that SpanMan automatically calculates the weight of roof battens and adds it to the roof weight. For details of weights refer to ABOUT > Technical.
Additional dead loads can also be added in the CRITERIA screen.
Modify manual load Help
Please select your ceiling compostion here. For details of weights refer to ABOUT > Technical
Pick 'List all suitable timber and steel sections' to design across all timber and steel sections. Alternatively design in a specific timber or steel material type. Press DESIGN to obtain sizes.
design Criteria