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Speed Deck Ultra® Materials Stramit Speed Deck Ultra® decking is manufactured from hi-tensile G550 colour coated steel or zinc-aluminium alloy coated steel. In some locations galvanised and severe environmental colour coated steel may be available by arrangement. Colour coated steels are in accordance with AS2728 - Category 3 and, for the substrate, with AS1397. Zinc-aluminium alloy coated AZ150 and galvanised Z450 conform to AS1397 Sheet Mass (kg/m2 of roof area) thickness BMT Zincalume Colorbond Galvanised 0.42mm 4.66 4.74 5.07 0.48mm 5.29 5.37 5.70 Recommended Span Chart (mm) Roofs Overhangs bmt (mm) pressure (kPa) internal (end) span combination free edge stiffened edge serviceability strength double span equal spans N1 or Region A (sheltered suburban) 0.42 0.76 1.35 1700 1700 2100 (1750) 150 450 0.48 0.76 1.35 2300 2300 2700 (2250) 200 500 N2 or Region B (sheltered suburban) and Region A (exposed suburban) 0.42 0.78 1.94 1700 1700 2100 (1750) 150 450 0.48 0.78 1.94 2300 2300 2700 (2250) 200 500 N3 or Region A (rural) and Region B (exposed suburban) 0.42 1.18 2.96 1700 1700 2100 (1750) 150 450 0.48 1.18 2.96 2050 2250 2550 (2150) 200 500 Walls N1 or Region A (sheltered suburban) 0.42 0.61 1.04 3000 2850 3000 (2500) 0.48 0.61 1.04 3000 2900 3000 (2500) N2 or Region B (sheltered suburban) and Region A (exposed suburban) 0.42 0.61 1.49 3000 2850 3000 (2500) 0.48 0.61 1.49 3000 2900 3000 (2500) N3 or Region A (rural) and Region B (exposed suburban) 0.42 0.92 2.25 2600 2350 2900 (2450) 0.48 0.92 2.25 2650 2450 2950 (2500) Internal spans must have both end spans 20% shorter. Values are only valid for use with steel members of 1.5mm or thicker. For more specific applications Stramit Speed Deck Ultra® decking must be designed to the pressure and foot traffic limitations below. Spans may exceed those shown in this table, provided the wind pressure and foot traffic limits are not exceeded. Spring Curving Stramit Speed Deck Ultra® decking can be spring curved, concave and convex, including curved ridges, provided it is within the recommended limits below: Spring-Curved Radii limits (m) restricted minimum* unrestricted minimum unrestricted maximum 0.42bmt 0.48bmt 90* 70* 100 225 * At these radii a maximum support spacing of 1200mm applies, and limit state pressure capacities are reduced by 14% for serviceability and 7% for strength. Water Carrying Stramit Speed Deck UItra decking has excellent water-carrying capacity. This and the decking stiffness enable roof slopes to be as low as one degree for many applications. Roof run lengths are the combined lengths of all roof elements contributing to a single pan drainage path. This can include the roof length upstream of a roof penetration that concentrates flow into other pans. The table below gives slopes for 100 year return period rainfall intensity. Minimum Roof Slope (degrees) rainfall intensity Total Roof Run Length (m) 50 60 70 80 90 100 110 120 130 140 150 150 1.0 1.1 1.4 175 minimum slope 1° 1.0 1.1 1.4 1.8 2.2 200 1.0 1.3 1.7 2.2 2.6 3.1 225 1.0 1.4 1.9 2.4 2.9 3.6 4.2 250 1.0 1.4 1.9 2.6 3.2 3.9 4.7 5.5 275 1.0 1.4 1.9 2.6 3.2 4.0 4.8 5.8 6.8 300 1.0 1.1 1.7 2.4 3.1 4.0 4.8 5.9 6.9 8.2 325 1.0 1.4 2.1 2.9 3.1 4.8 5.8 6.9 8.2 9.7 350 1.0 1.1 1.7 2.6 3.5 4.5 5.5 6.8 8.2 9.8 12 375 1.0 1.5 2.3 3.2 4.3 5.5 6.8 8.1 10 12 14 400 1.4 2.0 2.7 3.9 5.1 6.3 7.7 9.7 12 14 17 Maximum water protection is also ensured by the absence of fastener penetrations when using Stramit Speed Ultra® decking.