3/7/2024 0 Comments Roof rafter span tableRafters are to have minimum end bearing of 35mm. Wane as allowed in BS 4978:2007+A2:2017 is permitted in all sections included in these span tables. Timber to be covered, these span tables do not apply to timber which is fully exposed to the elements. Holes and notches cannot be drilled or cut into the rafters unless proved adequate by specialist calculations. The calculations on which these span tables are based conservatively assume that the rafters are not continuous over the purlins, but they can be continuous over the supporting purlin if required. These span tables are based on the assumption that the tiling battens fastened to the top of the rafters will provide adequate lateral restraint and also ensure that lateral loads are distributed. It is also assumed ceiling joists will be used to transmit the horizontal component of thrust occurring at eaves level to complementary rafters. These span tables only apply to roof systems with four or more rafters. These span tables do not apply to trussed rafter roofs. The dead loads shown at the top of span table above do not include the self weight of the rafters, however, the rafter self weights are included (in addition to the dead loads) in the calculations used to determine permissble clear spans. The allowable clear spans have been calculated in accordance with BS 5268-2:2002 Structural use of timber - Part 2: Code of practice for permissible stress design, materials and workmanship and BS 5268-7.5:1990 Structural use of timber - Section 7.5 Domestic rafters. All of these factors are critical for ensuring the structural integrity of any timber-based construction project.Dead load per square metre (in kN/m²) supported by raftersĬentre-to-centre spacing of rafters (in mm) Additionally, the tables specify the minimum spacing between rafters, as well as the maximum depth that can be safely used in a given application. The tables also provide information on the minimum number of nails that must be used when connecting the rafter to other components. 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. The Mgp10 Rafter Span Tables are essential for any builder or professional working with timber in Australia. The tables have been developed to make it easier for professionals to accurately determine the span of a rafter – or joist – when building a structure. The tables are based on the Australian Standard AS/NZS 1684-2010, which outlines the structural design of timber members and their connection to other structural components. This set of tables is designed to provide builders and other professionals with the necessary information needed to determine the safe span for a rafter – or joist – when used in construction. When it comes to construction and the use of timber in Australia, the Mgp10 Rafter Span Tables are an integral part of the process.
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