• Developed in conjunction with the University of Birmingham and under the supervision of Dr Jian Yang.

• Designed primarily for use on roofs as secondary sheeting support. Bay widths up to 15m and maximum roof slope of 25 degrees.

• Manufactured by cold roll forming pre-hot dipped galvanised steel, grade S450, minimum yield stress of 450N/mm2.

• Section properties calculated in accordance with Eurocode 3, BS EN 1993-1-3:2006.

• Calculation of ultimate loads and working deflections are based on the results of full scale testing and finite element analysis.

• The top flange of the purlin must have adequate restraint provided by robust steel sheeting (or similar) fixed directly to the top flange.

• The steel has an external galvanised coating Z275, giving an approximate coating thickness of 20 microns each side.