All of these factors are critical for ensuring the structural integrity of any timber-based construction project. The International Residential Code (IRC) 2021 specifies roof rafter spacings of 12', 16', 19.2', and 24'. 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. Download the guide for architects, specifiers and designers here.When it comes to construction and the use of timber in Australia, the Mgp10 Rafter Span Tables are an integral part of the process. Northbeam products are cut-to-length (up to 7.2m) and delivered swiftly and efficiently from Northpine’s distribution yard in Silverdale to sites all over New Zealand. Loads are calculated in accordance with Table 3.1 of AS/NZS 1170.1:2002. This is set by the roof use you selected in the previous screen and cannot be modified. Northbeam has been used for civil and commercial projects – from public walkways and wharves to farm gates and imposing entranceways – as well as in residential housing as exposed beams and rafters or pergolas and decks. The imposed uniformly distributed live load in the main span. “They will not need to pack under the engineered beams to make them the same size as standard SG8 joists on that level and their builders will be delighted not to have different fixing requirements to deal with.”Īvailable from all timber merchants, Northbeam structural products are independently verified by GradeRight to SG8 or SG10 standard and are also BRANZ Appraised. “When I told him that he could now get SG10 from his local merchant he made the change and saved his client thousands of dollars.”Īnother case involved a major Auckland housing company that changed their mid-floor joists on an apartment project from relatively costly engineered joists to SG10. Architects just need to go to the span tables to figure out how and where it can work for their clients using SG10 at 7.2m lengths.”Īs an example, Stuart cites a designer in Northland who had just finished specifying an engineered solution for all the rafters on one of his designs, because SG8 wasn’t going to span far enough and he couldn’t use a bigger timber size as the building was at maximum height. Not only is the Northbeam range procurable – at a price much more cost-effective than engineered wood products – but choosing the 7.2m length (SG8 or SG10) allows a specifier to get an additional 10% continuous span under the NZS:3604 standard. “Many specifiers these days don’t even consider choosing SG10 because they have been told that it’s simply not available. They get quite excited about the possibilities when they realise how they can specify Northbeam in the plan.” “The specifiers I visit in Auckland, Waikato and Bay of Plenty are sometimes reluctant to learn about a small timber mill up north, thinking it’s too far away to be relevant to them, but when they realise the enormous advantages they can achieve with Northbeam, it’s a light bulb moment. They are extremely strong and dense beams and posts capable of taking big loads.”īest of all, Stuart adds, Northpine’s mill is set up to process beams and posts of SG8 and SG10 up to 7.2metres long. They can be used for many different purposes – sub-floor, lintels, joists, rafters and so on … and for decks, exposed beams, walkways and pergolas. “They produce a range of high quality dressed and sawn timber beams, square posts and joists – from very strong Northland-grown pine – under the brand name Northbeam. One of his clients is a timber manufacturer in Waipu by the name of Northpine. Finding that point of difference, that key innovation, clever idea, efficient use of space or cost-effective material, is often problematic. Stuart gets to hear about the many issues facing the architectural sector as they all strive to deliver innovation and efficiencies for their clients.
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