The sleeved purlin system is suitable for buildings with two or more bays and utilizes single span length purlins with sleeves.
The sleeves are formed from the same section as the purlins but are installed inverted.
The sleeves, which achieve a high degree of continuity over the
purlin supports are fitted at all penultimate rafter connections and
staggered on all internal bays, allowing economy of purlin section
selection.
The system can be used for single span purlins and for double span purlins.
Butt System
The butted purlin system is suitable for all building types but is primarily used in single span applications.
It is the simplest purlin system and can be used in inset and oversail configurations.
Non standard end configurations can be accommodated as required.
Lap System
The lap system is a further variation of the sleeved system
which is suitable for buildings with five or more bays. Extended single
span purlins are alternatively inverted and overlapped with each other.
The lapped section has the benefit of achieving a high degree of
continuity over the purlin supports thus allowing economic section
selection.
The avoidance of sleeves means that there are fewer system components and additionally reduced site erection time.
Heavy End Bay System
The heavy end bay system is a variation of the sleeved system which is suitable for buildings with five or more bays.
Heavier gauge sections are fitted to the end bays with corresponding heavy gauge sleeves to all penultimate rafter connections.
Inner bay purlins are of lighter gauge as are the inner bay sleeves which are fitted at every connection.
The system can be used with double span inner bay purlins with fewer inner sleeves.
