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Purline® Weight Cover Thickness R Value Roof 5.5 kg/m² 1000 mm 20 mm nominal 1.5 m²K/W MATERIALS Element Thickness (mm) Type Upper Skin 0.42 Base Steel High Tensile G550 Core 20 nominal Polyisocyanurate Lower Skin 0.07 White PVC embossed Wind Category Max Permissible Spans (mm) Without Cyclone Washers With Cyclone Washerse Single Span End Span Internal Spanl Single Span End Span Internal Spanl W33N (N2) 1650 1650 1860 1650 1650 1860 W41N (N3) 1340 1130 1260 1340 1340 1500 W50N (N4) 1100 760 840 1100 1100 1230 Notes: The above tables apply to small buildings – up to small factory units in size. A local pressure factor of 2 and an internal pressure co-efficient of +0.2 has been used. Screw fix every rib.