The tables also provide information on the minimum. Depending on the type of timber being used, the span will vary. The tables provide detailed information on the maximum rafter length that can be safely used in a given application.
Centres is 300mm then it can only be used at 300mm centres.Ĭost Index is a rough estimate of the order of Joists and Centres, from cheapest to most expensive, based on RRP. The Mgp10 Rafter Span Tables are essential for any builder or professional working with timber in Australia. Centres' is 600mm then the joist can be used at 300mm, 400mm, 480mm and 600mm centres. designlT has been recently upgraded and the enhancements include: ' Beam sizing grouped in floor, wall and roofing applications ' Stud design, including design of. Centres' is the maximum centres that this joist can be used for in this application. Powerful building design software designll software is a powerful tool for all building practitioners to quickly and simply design more economical floor, wall and roof member layouts. It is assumed that for 'Built-In' joists that the masonry is 100mm wide and for joists 'On Hangers' the hanger has a 75mm bottom plate.
House Loading: 0.75kN/m2 Dead Load + 1.5kN/m2 Imposed Load.įlat Loading: 1.15kN/m2 Dead Load + 1.5kN/m2 Imposed Load.ĭeflection Limit: 0.003 x engineering span or 12mm whichever is lesser.
