![]() Download PDFs of the tables and see examples of how to read the table values. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. ![]() Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. Find the maximum spans for Southern Pine joists and rafters based on design values and load categories. This is the right way to fix truss clips connecting the rafter and wall plate. Vertical strapping at eaves pitched roofsĪt eaves level, vertical straps 1m long should be fixed as shown in the diagram opposite at a maximum of 2m centres. Effective strapping at gable wallĮach strap should be fixed as shown in the diagram opposite with noggins between the rafters to support the metal strap along its whole length. The first span tab is for roofs where which. Rafters with ceiling not append into rafters, sanding snow load 50 psf, died load 20 psf, flexion limit L/180. Gable walls need to be strapped to the roof at the maximum 2m centres using 30 x 5m galvanised mild steel straps. The span tables with this folio cover the following two project scenarios: Rafters with ceilings not attached to rafters, live load 20 psf, dead load 20 psf, deflection limit L/180. ![]() This diagram illustrates the typical arrangement of a rafter and purlin roof and shows the dimensions referred to in the tables above. Span tables are based on the International Building Code and International Residential Code, and are available for download or online access. Roof pitch between 30 and 45 degrees strength class C24 Size of purlins in mm Learn how to use span tables to calculate joist and rafter spans in one- and two-family dwellings, and the design values for dimension lumber.
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