The number of supports beams or purlins affects the allowable span length.
Long span c purlin roof design.
Four or more equi spaced supports.
If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.
Cpe 0 9 and cpi 0 2.
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.
C purlin and c girt structural steel wind snow weight tables.
Safe roof purlins spans.
We manufacture any component from 1 2 steel subgirts to 12 section up to 10 gauge.
Data is given in each table for.
Flexospan provides standard even profile c purlins and c girts as well as custom profiles and punching patterns.
The c sections can also form part of the columns and rafters in these smaller applications.
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.
Two supports one at each end double span.
If a steel girder must span 24 feet between columns it should be at least 18 deep.
Tables are given for 5 or more spans.
These tables are for spans in which purlins are lapped over each support where the lap length is 15 of the span.
Here is the formula for calculation of a roof purlin.
High pressure zones kl 1 5 and 2 0 included.
Maximum roof slope is 5 for monoslope and 22 5 for pitched roof.
For outwards loads on equal continuous spans the bridging shown is required in the end spans.
Three equi spaced supports equal spans.
If a steel purlin must span 24 feet between girders it should be at least 12 deep for girders calculate 3 4 inch of depth for every foot of span.
This post will be focusing on design of steel purlin using cold formed sections.
Continuous purlin span are simply supported at each end and at a series of equally spaced intermediate supports.
Use recommended minimum roof pitches as specified by roof sheet supplier.
The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm.
Arrangement of purlins by default purlin sections assume the slope of the roof they are supporting.
Flat roof span tables allow for a maximum roof pitch of 5ยบ.
For 2x4s purlins the posts are spaced in 4 feet distance.
Max roof span allowed 12m.
For purlins calculate 1 2 inch of depth for every foot of span.
C purlins and c girts.
The spacing of purlins usually call for careful arrangement in the sense that it should follow the nodal pattern of the supporting trusses.
Monoslope pitched single.
