PERMALITE ALSPAN® is a roofing profile made from marine grade aluminium alloy. It was designed specifically to provide a wide spanning capability, to have a high water carrying capacity and to accommodate foot traffic without damage.Key Information:Application: Roofing and wallingBase Metal Thickness: 0.70/0.90/1.20mmEffective Cover Width: 864mmRib Height: 52mmMinimum Pitch: 1 degree (1:50)