Wooden purlin PURLIN SYSTEMS

Definition Purlins are structural components that run parallel to the eaves and support the roof membrane. They can run on the girders or be hung between them. Variants Simple purlins These run on the girders or can be hung in. They can be installed vertically or perpendicularly into the roof level. Continuous purlins These run on the girders and have much less deflection than simple beams. Articulated purlins Arranged skilfully, this system (also called cantilever purlins) makes it possible to utilize the cross-section in an optimum way. The "joints" can be implemented using fasteners or dry splice joints made of galvanized sheet metal with ring nails. Lap jointed purlins These continuous purlins are made of simple beams as individual components and run alternately opposed to each other above the truss supports at beam width. The rigid joints are made by bolting, nailing or dowelling the adjacent components in set overlapping lengths.