Long Span C Purlin Roof Design

Flexospan provides standard even profile c purlins and c girts as well as custom profiles and punching patterns.

Long span c purlin roof design.

C purlin and c girt structural steel wind snow weight tables. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. Meanwhile there are two kinds of purlin span for metal roof based on the shapes which are the c purlins and z purlins. The number of supports beams or purlins affects the allowable span length.

Use recommended minimum roof pitches as specified by roof sheet supplier. Monoslope pitched single. We manufacture any component from 1 2 steel subgirts to 12 section up to 10 gauge. In general c purlins sheds are best for smaller spans.

Maximum roof slope is 5 for monoslope and 22 5 for pitched roof. Flat roof span tables allow for a maximum roof pitch of 5º. 2 what is. 20 95 30 d c a b variable angle 18 x 22 holes 34 x 10 recess upturned lip z sections.

C purlins and c girts. This post will be focusing on design of steel purlin using cold formed sections. 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. Provide a long and trouble free life for enclosed buildings.

Two supports one at each end double span. Three equi spaced supports equal spans. Metroll purlin design guide capacity tables a met tech guide c z standard purlins july 2019. 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.

However some manufacturers sell designs to do up to 24 metres in span. The spacing of purlins usually call for careful arrangement in the sense that it should follow the nodal pattern of the supporting trusses. 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. Spantec has prepared these tables for use by people skilled in the design and specification of the.

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. Data is given in each table for. This is right at the limit of a purlin s capacity and does no leave much margin for coping with nasty weather conditions. Flange bent to suit the roof slope.