Welded Purlin Shed Roof

This design is a lot stronger and more robust way of making a steel shed.

Welded purlin shed roof.

Insert two equally spaced nails into the rafter. Purlins are usually connected to the main portal frame with cleats. Snap a chalk line horizontally across the roof two feet down from the top. The purlin and the sheeting are weaker inside outside than they are up and down in this configuration.

Lay the first purlin at the ridge of the roof down to the chalk line beginning at either corner. If your puttin up steel buildings its likely your charging by the square foot don t grind nothing use 1 8 5p or 5p setting depends on your travel speed i run hot and fast to get it done. The cleats and purlins holes or punching are generally done to the aisc standardised structural connections with most fabricators manufacturers working within the standards. In a structural steel shed the main portal frames and roof rafters are made from strong steel sections which are welded together and later bolted together.

Purlins and girts are used longitudinally to support the roof sheeting which they were originally designed for. So when we orient the purlin horizontally we make the wall much stronger inside outside. In cold rolled steel sheds the cleats are bolted to the frame with purlins bolted to the cleats.