Steel Purlin Flat Roof

Fasten the purlin with 16d common nails into each vertical rafter.

Steel purlin flat roof.

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. 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. Flat roofs the recent and more onerous requirements of approved document l of the building regulations relating to energy conservation have shifted the emphasis for thermal efficiency from the building structure to the building envelope.

As the roof live load of 20 psf is being carried by members 24 o c. Engineered purlin metal mart offers a complete line of engineered purlin material. 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. Illustration shows purlins at 1 2m centres however the maximum purlin centres should not exceed 1 8m.

Do all roofing projects require purlins. Snap a chalk line horizontally across the roof two feet down from the top. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Steeline c purlins are made from quality galvaspan steel and are roll formed to length with holes punched to your specification.