Steel Purlin Flat Roof

As the roof live load of 20 psf is being carried by members 24 o c.

Steel purlin flat roof.

With the slope of the roof the live load can be reduced using the cosine of the roof slope 0 949 to get the applied load of 18 98 psf. Do all roofing projects require purlins. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Lay the first purlin at the ridge of the roof down to the chalk line beginning at either corner.

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. Insert two equally spaced nails into the rafter. Steeline c purlins are made from quality galvaspan steel and are roll formed to length with holes punched to your specification. Steeline c purlins are available in different sizes and material strengths to match the design specification of your building.

Illustration shows purlins at 1 2m centres however the maximum purlin centres should not exceed 1 8m. 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. The purlins have to be able to support their own weight of about 0 5 psf pounds per square foot plus the steel 0 63 psf. Fasten the purlin with 16d common nails into each vertical rafter.