Long Span C Purlin Roof Design

Four or more equi spaced supports.

Long span c purlin roof design.

Use recommended minimum roof pitches as specified by roof sheet supplier. Monoslope pitched single. This post will be focusing on design of steel purlin using cold formed sections. Two supports one at each end double span.

Flexospan provides standard even profile c purlins and c girts as well as custom profiles and punching patterns. 20 95 30 d c a b variable angle 18 x 22 holes 34 x 10 recess upturned lip z sections. Provide a long and trouble free life for enclosed buildings. Spantec has prepared these tables for use by people skilled in the design and specification of the.

Data is given in each table for. We manufacture any component from 1 2 steel subgirts to 12 section up to 10 gauge. Meanwhile there are two kinds of purlin span for metal roof based on the shapes which are the c purlins and z purlins. However some manufacturers sell designs to do up to 24 metres in span.

C purlin and c girt structural steel wind snow weight tables. Arrangement of purlins by default purlin sections assume the slope of the roof they are supporting. 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. 2 what is.

Flange bent to suit the roof slope. However some manufacturers sell designs to do up to 24 metres in span. This is right at the limit of a purlin s capacity and does no leave much margin for coping with nasty weather conditions. To identify whether yours is the earlier or the latter type look for the end of the rails and check whether the shapes mimics the shape of letter c or letter z.

Three equi spaced supports equal spans. Purlins rails eaves beams z e d p u r l i n s y s t e m s e a v e s be a m s z e d c e e s h e e t i n g r a i l s fl o o r c e e s design guide september 2014. Metroll purlin design guide capacity tables a met tech guide c z standard purlins july 2019. The spacing of purlins usually call for careful arrangement in the sense that it should follow the nodal pattern of the supporting trusses.

Flat roof span tables allow for a maximum roof pitch of 5º. The number of supports beams or purlins affects the allowable span length. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. In general c purlins sheds are best for smaller spans.