SmartLVL 15 Design Guide - Tilling Timber

UNDERPURLINS - SHEET AND TILED ROOFAS 4055 WIND CLASSIFICATION C1, C2 & C3Strutting beamUnderpurlinRafterspacingRoof strutRidge board'X' = Total of rafter spanseither side ofunderpurlinSpanSpan (backspan)Maximum cantilever = 1/4 allowable backspanMinimum backspan = 3 x actual cantileverEXAMPLE:wind speed = C3rafter spacing = 1200 mmroof load = 20 kg/m 2 (sheet roof)underpurlin span = 3500 mm (single span)‘X’ (total of rafter span) = 5400 mmroof load width = ‘X’ / 2 = 5400 / 2 = 2700 mmEnter single span table at 2700 mm roof load width column, 1200rafter spacing and read down to span equal to or greater than 3500mm in a 20 kg/m 2 rowADOPT:SmartLVL 15 — 190x58RLW = X/2 where ridge is struttedRoof load width (mm) 1800 2700 3600 1800 2700 3600rafter spacing (mm) 600 1200 600 1200 600 1200 600 1200 600 1200 600 1200Member size Roof massSingle spanContinuous spanDxB (mm) (kg/m 2 )Maximum Underpurlin span (mm)90x35 20 1800 1500 1500 1000 1300 NS 1900 1900 1400 1400 1300 NS60 1400 1200 1300 1000 1100 NS 1900 1900 1600 1400 1400 NS120x35 20 2400 2400 1900 1700 1600 1300 2500 2600 2000 1800 1500 150060 1900 1900 1600 1600 1500 1400 2600 2600 2100 2000 1600 5 1500130x35 20 2600 2600 2100 2000 1800 1500 2700 2700 2200 2100 1700 150060 2100 2000 1800 1800 1600 1500 2700 2800 2200 5 2100 5 1800 15 1500 590x42 20 2000 1900 1600 1200 1400 NS 2100 2000 1700 1400 1400 100060 1500 1400 1300 1100 1200 NS 2000 2000 1700 1700 1400 1300120x42 20 2700 2600 2200 2000 1800 1500 2700 2700 2200 2100 1900 150060 2000 2000 1700 1700 1600 1500 2700 2700 2200 2200 1900 5 1500130x42 20 2900 2800 2400 2200 2000 1800 2900 2900 2400 2500 2000 200060 2200 2200 1900 1900 1700 1700 3000 3000 2400 2600 2100 10 2000 5140x42 20 3100 3000 2500 2400 2200 2000 3100 3100 2600 2600 2200 210060 2300 2400 2100 2000 1900 1900 3200 3100 2600 5 2700 5 2200 15 2100 10150x42 20 3300 3100 2700 2600 2300 2200 3300 3300 2700 2700 2300 220060 2500 2600 2200 2200 2000 2000 3400 3300 2800 10 2800 10 2400 20 2500 2590x58 20 2400 2400 1900 1700 1600 1300 2500 2600 2000 1900 1700 170060 1700 1600 1500 1300 1300 1100 2300 2200 2000 1900 1700 1700130x58 20 3400 3300 2800 2700 2400 2300 3400 3400 2800 2800 2400 260060 2400 2500 2100 2100 1900 1900 3300 3200 2900 2900 2500 2600150x58 20 3900 3800 3200 3000 2700 2700 3900 3900 3200 3200 2800 280060 2800 2800 2500 2500 2200 2200 3800 3800 3300 3200 2800 10 2800 10170x58 20 4400 4300 3600 3400 3000 2900 4400 4400 3600 3500 3100 310060 3200 3100 2800 2800 2500 2600 4300 4300 3700 5 3600 5 3200 15 3100 15200x58 20 5100 5100 4100 4000 3600 3400 5100 5200 4200 4200 3600 10 3500 1060 3700 3700 3300 3200 3000 3000 5000 5100 4200 15 4200 15 3700 30 3600 30300x75 20 6000 6000 6000 6000 5900 5800 6000 6000 6000 10 6000 10 6000 35 5900 3560 6000 6000 5300 5300 4900 4900 6000 6000 6000 25 6000 25 6000 55 6000 55NOTES:1. D = member depth, B = member breadth, NS = not suitable.2. Maximum cantilever = 1/4 allowable backspan3. Minimum backspan = 3 x actual cantilever4. End bearing length = 45 at end supports and 45 mm at internal for continuous member. Subscript values indicate the minimum additional bearinglength where required to be greater than 45 mm at end support and 45 mm at internal for continuous member5. Not all sizes of SmartLVL 15 in this table are stocked in each state. (F17 sizes of 120, 140, 190 and 290 mm depths not currently stocked in WA).Please check with your supplier before orderingSmartLVL 15 Design Guide 65