BW Purlin Systems
- 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.
- 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.
- 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.