Steel Purlin Flat Roof

Insert two equally spaced nails into the rafter.

Steel purlin flat roof.

Fasten the purlin with 16d common nails into each vertical rafter. 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. Illustration shows purlins at 1 2m centres however the maximum purlin centres should not exceed 1 8m.

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. 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. Steeline c purlins are made from quality galvaspan steel and are roll formed to length with holes punched to your specification. Snap a chalk line horizontally across the roof two feet down from the top.

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