Home > Stramit Building Products > Commercial Roofing

Longspan® Adverse Conditions Stramit Longspan® cladding will give excellent durability in almost all locations. It is however important to choose the correct coating for each application environment. The table below shows the suitability of coating types for different exposure conditions. suitability of coating type site exposure condition benign moderate severe very severe Zincalume AZ150 ? ? Galvanised Z450 ? Colorbond XRW ? Colorbond XSE N/A N/A ? ? Question marks indicate conditions where durability may be diminished, depending on the particular application. The approximate site exposure conditions in the table above are defined below. Distance of site from site exposure conditions rough active surf calm, still salt water industrial emission fossil fuel combustion benign 1000m + 100m + 500m + 500m + moderate 400m-1000m 0-100m 250m-500m 250m-500m severe 100m-400m N/A 100m-250m 100m-250m very severe 0-100m N/A 0-100m 0-100m Spans The spans shown below take account of 'normal' foot traffic and wind resistance including local pressure zone effects. Pressures are based on AS4055 or AS1170.2 section 2. Where the two standards differ, the worst case has been taken for each classification. Data should only be used for buildings 7m or less in height, 1000m2 or less in area and unaffected by land topography. Maximum Span Chart (mm) Fasteners per sheet at each support 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 3 screws 4 screws 0.76 0.76 1.35 1.35 1750 1750 1750 1750 2100 (1750) 2100 (1750) 200 200 500 500 0.48 3 screws 4 screws 0.76 0.76 1.35 1.35 2250 2250 2250 2250 2700 (2250) 2700 (2250) 250 250 500 500 N2 or Region B (sheltered suburban) and Region A (exposed suburban) 0.42 3 screws 4 screws 0.78 0.78 1.94 1.94 1750 1750 1750 1750 2100 (1750) 2100 (1750) 150 200 450 500 0.48 3 screws 4 screws 0.78 0.78 1.94 1.94 2250 2250 2250 2250 2700 (2250) 2700 (2250) 200 250 500 500 N3 or Region A (rural) and Region B (exposed suburban) 0.42 3 screws 4 screws 5 screws 1.18 1.18 1.18 2.96 2.96 2.96 1600 1750 1750 1600 1750 1750 1900 (1550) 2100 (1750) 2100 (1750) 100 150 150 400 450 450 0.48 3 screws 4 screws 5 screws 1.18 1.18 1.18 2.96 2.96 2.96 2050 2250 2250 2050 2250 2250 2350 (1950) 2650 (2200) 2700 (2250) 150 200 250 450 500 500 Walls N1 or Region A (sheltered suburban) 0.42 3 screws 4 screws 0.61 0.61 1.04 1.04 2700 3000 2700 3000 3000 (3000) 3000 (2500) 0.48 3 screws 4 screws 0.61 0.61 1.04 1.04 3000 3000 3000 3000 3000 (2500) 3000 (2500) N2 or Region B (sheltered suburban) and Region A (exposed suburban) 0.42 3 screws 4 screws 0.61 0.61 1.49 1.49 2700 3000 2700 3000 3000 (2500) 3000 (2500) 0.48 3 screws 4 screws 0.61 0.61 1.49 1.49 3000 3000 3000 3000 3000 (2500) 3000 (2500) N3 or Region A (rural) and Region B (exposed suburban) 0.42 3 screws 4 screws 5 screws 0.92 0.92 0.92 2.25 2.25 2.25 2050 2500 2550 2050 2500 2500 2350 (1950) 2650 (2200) 3000 (2500) 0.48 3 screws 4 screws 5 screws 0.92 0.92 0.92 2.25 2.25 2.25 2500 2900 2850 2500 2900 2900 2800 (2300) 3000 (2500) 3000 (2500) Internal spans must have both end spans 20% shorter. Values are only valid for use with steel members of 0.75mm or thicker. For more specific applications Stramit Longspan® cladding must be designed to the pressure and foot traffic limitations below. Pressures Serviceability Limit State Capacity thickness bmt (mm) fasteners per sheet span type (kPa) at the spans (mm) shown 600 900 1200 1500 1800 2100 2400 2700 3000 0.42 3 internal equal double 1.66 1.58 1.58 1.66 1.58 1.58 1.53 1.42 1.42 1.39 1.25 1.25 1.25 1.07 1.07 1.10 0.90 0.90 0.95 0.75 0.75 0.82 0.62 0.62 0.70 0.54 0.54 4 internal equal double 5.58 4.93 4.93 5.58 4.93 4.93 4.52 3.78 3.78 3.60 2.82 2.82 2.82 2.05 2.05 2.16 1.45 1.45 1.63 1.03 1.03 1.22 0.77 0.77 0.93 0.66 0.66 5 internal equal double 5.58 4.93 4.33 5.58 4.93 4.33 4.52 3.78 3.60 3.60 2.82 2.87 2.82 2.05 2.19 2.16 1.45 1.59 1.63 1.03 1.11 1.22 0.77 0.78 0.93 0.66 0.65 0.48 3 internal equal double 2.66 2.39 2.39 2.66 2.39 2.39 2.24 1.98 1.98 1.92 1.69 1.69 1.69 1.49 1.49 1.52 1.34 1.34 1.39 1.18 1.18 1.26 0.99 0.99 1.12 0.71 0.71 4 internal equal double 8.67 7.17 7.17 8.67 7.17 7.17 6.31 4.88 4.88 4.57 3.35 3.35 3.35 2.42 2.42 2.54 1.88 1.88 2.03 1.55 1.55 1.70 1.25 1.25 1.46 0.77 0.77 5 internal equal double 8.67 7.17 4.97 8.67 7.17 4.97 6.31 4.88 3.94 4.57 3.35 3.09 3.35 2.42 2.39 2.54 1.88 1.84 2.03 1.55 1.40 1.70 1.25 1.05 1.46 0.77 0.79 Strength Limit State Capacity (Non-Cyclonic) thickness bmt (mm) fasteners per sheet span type (kPa) at the spans (mm) shown 600 900 1200 1500 1800 2100 2400 2700 3000 0.42 3 internal equal double 7.35 6.98 6.98 7.35 6.98 6.98 5.82 5.24 5.24 4.56 3.89 3.89 3.56 2.90 2.90 2.78 2.22 2.22 2.21 1.79 1.79 1.80 1.56 1.56 1.54 1.48 1.48 4 internal equal double 8.57 8.63 8.63 8.57 8.63 8.63 6.80 6.49 6.49 5.35 4.85 4.85 4.19 3.65 3.65 3.30 2.83 2.83 2.64 2.35 2.35 2.20 2.15 2.15 1.94 2.17 2.17 5 internal equal double 9.39 9.41 9.41 9.39 9.41 9.41 8.35 8.11 8.11 7.36 6.92 6.92 6.44 5.85 5.85 5.60 4.93 4.93 4.86 4.21 4.21 4.23 3.71 3.71 3.74 3.46 3.46 0.48 3 internal equal double 8.09 7.83 7.83 8.09 7.83 7.83 6.62 6.13 6.13 5.39 4.77 4.77 4.37 3.72 3.72 3.55 2.94 2.94 2.90 2.39 2.39 2.41 2.03 2.03 2.06 1.83 1.83 4 internal equal double 9.63 9.58 9.58 9.63 9.58 9.58 7.50 7.14 7.14 5.88 5.43 5.43 4.69 4.30 4.30 3.85 3.61 3.61 3.28 3.20 3.20 2.91 2.92 2.92 2.67 2.63 2.63 5 internal equal double 11.18 10.77 10.77 11.18 10.77 10.77 9.35 8.76 8.76 7.91 7.29 7.29 6.80 6.24 6.24 5.96 5.50 5.55 5.33 4.97 4.97 4.86 4.53 4.53 4.49 4.08 4.08 Tables are based on testing to AS1562 and AS4040 parts 0, 2 and 3. Internal spans must have bothe end spans 20% shorter. Values only valid for use with steel support members of 0.75mm or thicker. Foot Traffic Foot traffic limits for Stramit Longspan® cladding are shown for three alternate foot traffic categories. These are: High maintenance - for applications with repeated maintenance, particularly where personnel may be unfamiliar with correct procedures for walking on metal roofs. Normal - based on traditional expectations, with moderate maintenance foot traffic using designed foot paths. Controlled - spans that conform to AS1562 but require minimal careful foot traffic only on the designated foot path. Suggested for use only where occasional aesthetic imperfections from foot traffic are acceptable. Foot Traffic Limited Spans (mm) Thickness bmt span type foot traffic limits heavy normal controlled 0.42 internal - 2100 2400 equal - 1750 1800 double - 1750 1800 0.48 internal 800 2700 3000 equal 600 2250 2250 double 600 2250 2250 Tables are based on tests to AS1562 and AS4040 parts 0 and 1.