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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Building Regulations and Standards: Span Tables (the 'Official Version')

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  1.  
    • CommentAuthorTriassic
    • CommentTimeMar 14th 2014
     
    Where do I find the 'official' span tables, I've done a search on tinternet but I'm scratching my head as to which is the one I should be referencing on my plans for planning and building control purposes.
    • CommentAuthorneilu
    • CommentTimeMar 14th 2014
     
    I presume you mean tables for timber floor, ceiling, purlin and rafter joists.
    They were removed from the building regulations part B a long time ago.
    Then they were published by Trada, you could have a look there.
  3.  
    Quick google,

    http://www.diynot.com/forums/viewtopic.php?t=241650

    they say try:
    http://www.dfpni.gov.uk/d.pdf

    Although I think official is down to however signs off the calcs.
    • CommentAuthorTimber
    • CommentTimeMar 14th 2014
     
    Span tables to EC5 published by TRADA.

    http://bookshop.trada.co.uk/bookshop/view/7B2DAE65-515F-463D-AFCD-2C6811CB4DA1

    If you are a member of TRADA, you can use the online timber sizer software, which is an interactive version of the span tables.
    • CommentAuthortony
    • CommentTimeMar 14th 2014
     
    My rule of thumb was span in feet divided by two, call that inches and add one = joist size!

    Works for wood floor joists every time!
  6.  
    I thought it was add 2
    (Span/2)+2 for rule of thumb.
    Works with decimeters also
    • CommentAuthorfuncrusher
    • CommentTimeMar 15th 2014
     
    definitely +2 inches : but only works for standard timber single spans between about 8ft and 16ft, AND limited to domestic loadings with 16" (400mm) spacing of joists.Also, cross-bracing (blocks between joists) also reqd. Remember that deflection not strength is the usual limiting factor. Modern composite laminated "i" beams are capable of much greater spans.

    If spanning two adjacent rooms, a single long beam resting on the party wall gives much better performance than two separate shorter beams with ends resting on the wall.

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