![]() ![]() The span tables are a first taste of TDUK’s forthcoming Knowledge Library, which will be published over the next few months. Special Engineering Note: Open Joist trusses may be manufactured with components that provide increased structural values that may exceed the performance levels indicated in these charts. Both sets of span tables can be downloaded from our Resources pages: C16 span tables.NOTE: Clear spans shown on this chart are presented under the following conditions: (1) Bearing size varies and is determined by loading conditions, truss span and truss spacing (2) "Strongback" bracing is not considered (3) Assumes composite action with a single layer of 3/4" wood sheathing glued and nailed or screwed (4) Spans are clear distance between supports for uniformly loaded trusses and include allowable increases for repetitive use members.Spans may be increased by 10 if rafter and joist spans are no greater than 3. Lintel spans may be increased by 5 if rafter and joist spans are no greater than 4.3 m and roof truss spans are no greater than 8.6 m. The calculations apply to buildings up to three storeys in height above ground level. Lintel spans are calculated based on a maximum floor joist, roof joist or rafter span of 4.9 m and a maximum roof truss span of 9.8 m. There are numerous rafter set hand ready, and our preference is aforementioned Amer Wood Council’s web-based Reach Calculator.You can select ‘Max Span’ or ‘Span Options’, wood species, dimensions, grade, component type, deflection, spacing, live load, done unload, technical conditions, real whether it’s incised lumber or not. 4th edition’ contains section sizes and spans for solid timber members in floors, ceilings and roofs (excluding trussed rafter roofs) for dwellings. To find maximum clear span for a given truss depth in a given loading condition, refer to the bottom line of spans shown for that particular truss depth. The ‘Eurocode 5 span tables for solid timber members in floors, ceilings and roofs for dwellings. Maximum spans published on the chart above may be limited by standard joist configuration. Technical detail sheets and a dynamic AutoCAD block are available here. * Because OPEN JOIST is a "stock" product, the length of an OPEN JOIST truss determines the size and grade of the truss' chords (see table below). If your requirement is outside of the options available here, you are thinking about using Posi-Rafters, or you require further information for specification purposes please email our design team email protected. ![]() View details on fire resistance assemblies for one and two hour endurance.9-1/4" Depth Maximum Live Load Deflection (L/360 & L/480, 1-1/2" Minimum Bearing Each End)ġ1-1/4" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End)ġ1-7/8" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End)ġ4" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End)ġ6" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End)ġ8" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End)Ģ0" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End) ![]()
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