Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. 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. All we do now is use a calculator to multiply 1. This means that for every 1m the rafter travels horizontally, the angled length of the roof will be 1.1543m. 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 length of rafter per meter of run is 1.1543. Click the button to calculate the stock size needed for this job. (2) Spans for floor joists that are not selected from Tables A-1 and A-2 and that are required. Gable walls need to be strapped to the roof at the maximum 2m centres using 30 x 5m galvanised mild steel straps. Input the rafter span (on the flat), eave overhang and pitch of the roof. (1) Except as required in Sentence (2) and Article 9.23.13.10., the spans for wood joists and rafters shall conform to the spans shown in Tables A-1 to A-7 for the uniform live loads shown in the Tables. This diagram illustrates the typical arrangement of a rafter and purlin roof and shows the dimensions referred to in the tables above. Usually 400, 450 or 600mm, but any value can be used up to 610mm max. This is the distance between rafter centres. Roof pitch between 30 and 45 degrees strength class C24 Size of purlins in mm This demo version is fixed at 1m clear span.
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