Steel Purlin Flat Roof

Steeline c purlins are available in different sizes and material strengths to match the design specification of your building.

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. Snap a chalk line horizontally across the roof two feet down from the top. Engineered purlin metal mart offers a complete line of engineered purlin material. Fasten the purlin with 16d common nails into each vertical rafter.

Do all roofing projects require purlins. As the roof live load of 20 psf is being carried by members 24 o c. Steeline c purlins are made from quality galvaspan steel and are roll formed to length with holes punched to your specification. 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.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Illustration shows purlins at 1 2m centres however the maximum purlin centres should not exceed 1 8m. Lay the first purlin at the ridge of the roof down to the chalk line beginning at either corner. Insert two equally spaced nails into the rafter.