voestalpine Metsec sleeved-purlin-system

Sleeved Purlin System

2 bays or more
(where heavy end bay system is precluded).

Roof purlins for buildings with 2 bays and over, up to and including 25° roof pitch.

The sleeved system optimises the use of steel by incorporating sleeves at the penultimate rafter with a staggered sleeving arrangement on internal bays. The sleeved system caters for spans up to 15m depending on the load to be applied and where the cladding or liner tray offers adequate lateral support by virtue of its screw fixings at 600mm maximum spacings to the purlins. To enable the purlin and sleeve to nest together the sleeve is inverted.

Computer controlled production techniques apply the client’s individual mark numbers to all purlins automatically during the manufacturing process.

Single span system

Single span lengths can be supplied to suit individual requirements. Penultimate rafter connections are sleeved with a staggered sleeving arrangement on internal bays.

Typical single span arrangement indicating purlin and sleeve positions.

Double span system

End bay purlins are single span, with double span purlins on internal bays. The maximum span between rafters is 7.5m, therefore maximum double span length is 15m.
A sleeve must always occur at a joint position.

Typical double span arrangement indicating purlin and sleeve positions.

Note: consideration must be given to the handling of longer lengths.


Sleeved system (mm)


Unless otherwise stated, all required holes are 18mm diameter for M16 bolts and are normally pierced in pairs on standard gauge lines.

For ‘General detailing’ notes see General Detailing Information.