Metal Roof Purlin Span

Engineered purlin metal mart offers a complete line of engineered purlin material.

Metal roof purlin span.

Safe roof purlins spans the safe spans below are suitable for sheds and class 1 structures with the following assumptions. Galvaspan steel c section purlins come in different sizes and thicknesses to cater for your needs. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. Continuous purlin span are simply supported at each end and at a series of equally spaced intermediate supports.

02 6554 6422 email. Z purlin and girt section properties. Do all roofing projects require purlins. 29 norfolk close tuncurry nsw 2428 phone.

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. For sake of discussion we will assume a minimal roof snow load of 20 psf pounds per square foot and a 4 12 roof slope. Tables are given for 5 or more spans. Non cyclonic sites only cpe 0 9 and cpi 0 2 high pressure zones kl 1 5 and 2 0 included max roof span allowed 12m.

They are available in galvanized and stainless steel and can be coated in zam and or prime painted. C and z span load table. Available in cee or zee shape red oxide primed or galvanized 16 14 or 12 gauge sizes from 4 up to 12 flange widths of 1 1 2 up to 4 cut to your specified lengths hole punching available load tables available for all material. We do recommend it however.

Roof purlins are used for fastening metal roof panels. 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. These tables are for spans in which purlins are lapped over each support where the lap length is 15 of the span. Dead load will be the actual weight of the roof steel and the roof purlins.

Homepage metal roof metal roof purlins spacing and rafter distance details by rooflast posted on june 29 2020 june 29 2020 during the roof installation or re roofing process after the roof sheets are prepared it is time to support their framework by installing purlins. Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. Meanwhile there are two kinds of purlin span for metal roof based on the shapes which are the c purlins and z purlins.