Metal Roof Purlin Span

Do all roofing projects require purlins.

Metal roof purlin span.

These tables are for spans in which purlins are lapped over each support where the lap length is 15 of the span. They are available in galvanized and stainless steel and can be coated in zam and or prime painted. Z purlin and girt section properties. Galvaspan steel c section purlins come in different sizes and thicknesses to cater for your needs.

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. 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. 29 norfolk close tuncurry nsw 2428 phone. 02 6554 6422 email.

Tables are given for 5 or more spans. Continuous purlin span are simply supported at each end and at a series of equally spaced intermediate supports. Safe roof purlins spans the safe spans below are suitable for sheds and class 1 structures with the following assumptions. Dead load will be the actual weight of the roof steel and the roof purlins.

In this section you ll find sample calculations for determining wind and snow loads as well as z purlin and z girt weight tables. 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. Meanwhile there are two kinds of purlin span for metal roof based on the shapes which are the c purlins and z purlins.

Engineered purlin metal mart offers a complete line of engineered purlin material. 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. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

C and z span load table. 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. 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.