Results 1 to 18 of 18
  1. #1
    watson's Avatar
    watson is offline Soldiers Earned Your Right To Free Speech
    Join Date
    Sep 2006
    Location
    Avoca Victoria
    Age
    71
    Posts
    8,349
    Blog Entries
    1

    Default Decking span tables

    These are some Span Tables for use in Building your Deck.
    They were kindly provided by our well known forum member Bloss and bpj1968.
    If you have any updated information please contact the Web Master

    Deck Span Tables Treated Pine.pdf

    Timber Deck Guide.pdf

    Allseasons Span Table Set(4).pdf

  2. #2
    bpj1968 is offline Senior Member
    Join Date
    Apr 2006
    Location
    Melbourne Victoria
    Posts
    352

    Default

    Another good one for bearers and joists

    SPAN TABLE

  3. #3
    watson's Avatar
    watson is offline Soldiers Earned Your Right To Free Speech
    Join Date
    Sep 2006
    Location
    Avoca Victoria
    Age
    71
    Posts
    8,349
    Blog Entries
    1

    Default

    Thanks mate.

  4. #4
    bpj1968 is offline Senior Member
    Join Date
    Apr 2006
    Location
    Melbourne Victoria
    Posts
    352

    Default

    Another great source is
    TIMBER SOLUTIONS program.

    It is a bit hard to use for a novice but once you work it out it is excellent as you can make design specific span tables, instead of having to settle for preset floor load widths for bearers etc.

    I posted some easy to follow (I think) instructions in this thread Great Free Software for bearer and Joist estimation

  5. #5
    watson's Avatar
    watson is offline Soldiers Earned Your Right To Free Speech
    Join Date
    Sep 2006
    Location
    Avoca Victoria
    Age
    71
    Posts
    8,349
    Blog Entries
    1

    Default

    Thanks Brian,
    I'll amend the LIbrary tonight and insert those links. I won't download the software due to a couple of copyright problems, but I'll also include the link to yours and Deckies instructions

  6. #6
    bpj1968 is offline Senior Member
    Join Date
    Apr 2006
    Location
    Melbourne Victoria
    Posts
    352

    Default

    The attached PDF is a
    simple set of span tables for decks
    .

    I tried to make it as idiot proof as possible
    I calculated these using Timber Solutions software.

    I only used F5 treated pine to calculate, and the most common sizes.

    The bearer table I think is the easiest to use, as you select the size joist you want, and then can match it with the bearer to work out your calculations.

    NOTE although 90x90 and 140x45 bearers are listed these DO NOT appear in any span table I have been able to find.

    Usual disclaimer - I tried to be as accurate as possible, but take NO responsibility
    Attached Files Attached Files

  7. #7
    dukekamaya is offline Senior Member
    Join Date
    Jul 2010
    Location
    Callala Bay
    Posts
    159

    Default

    Quote Originally Posted by bpj1968 View Post


    NOTE although 90x90 and 140x45 bearers are listed these DO NOT appear in any span table I have been able to find.
    90x90 is not listed as a bearer as its generally used as a post. A 90mm high bearer is a 90x70 - either solid (F7)or laminated(GL8)
    140x45mm is generally used as a joist.
    Whilst many decks including ones I have built have single member bearers, the BCA requires treated pine bearers to 'doubled-up' either by nail lamination or glue lamination. Bearer span tables will always appear as 2/90x35, 2/140x35 etc.
    I have many times used 190x45 single member bearers on decks spanning up to 3 metres and they are as solid as a rock. The BCA bearer requirement is a massive overkill IMO

  8. #8
    zbooynick is offline Member
    Join Date
    Sep 2010
    Location
    Victoria
    Posts
    70

    Default

    Attachment from AS 1684.2 2010, F5 spans for N1 class wind
    Attached Files Attached Files

  9. #9
    Hobby builder is offline Apprentice (new member)
    Join Date
    Dec 2010
    Location
    Gold Coast
    Posts
    14

    Default

    Hi all,

    Like a lot of people on here I am in the process of building a deck. I have put quite a few together in the past (helping builder dad), however I have never planned one from scratch so I am struggling a bit with what to use where to make it solid yet not overkill to support a tank.


    A few questions:

    (1) All decks I have put together in the past are just single bearers, yet the book & AS refer to doubles. Are doubles really required?
    (2) I am planning on a single 140 x 45 bearer, sitting directly in the stirrup (only got 300mm to play with), however I can't find a 45mm stirrup. Should I just cut a 45mm block to fill up the stirrup next to the bearer then bolt through the lot?
    (3) Given the deck is only 300mm to the top of the boards, does this require council approval?

    Many thanks!

  10. #10
    charliegrub is offline Apprentice (new member)
    Join Date
    Dec 2010
    Location
    Gosford NSW
    Posts
    2

    Default decking spans for supporting a spa

    The decking span information is great, but what adjustments or considerations are to be made to support a spa on a deck?

  11. #11
    jkirky is offline Member
    Join Date
    Nov 2010
    Location
    sydney
    Posts
    80

    Default

    These span tables are great and a must for any deck builder, however we need to remember that these tables should be treated as a minimum rather thann the "standard". Some of the specs given are known to cause problems such as deck bounce with the specified spans.

    Use the tables but if budget allows, either reduce your span from the maximum allowable span, or increase your timber spec as so you allow for sufficient factor of safety.

    We have far too many decks fail and i believe this to be the cause- treating the "minimum requirements" as the "standard". Quite often the extra costs incurred are minimal but the results are far better.

    The only thing worse than deck bounce is catastrophic deck failure. I know for a fact that some of the spans indicated by the tables if used as a spec, WILL produce significant deck bounce. Best to up the size of the timber by 30 percent or reduce the maximum allowable span by 30 percent...

  12. #12
    Bloss is offline Old Chippy - 4K Club Member
    Join Date
    Mar 2007
    Location
    Canberra
    Age
    62
    Posts
    5,588

    Default

    Quote Originally Posted by jkirky View Post
    . . . . We have far too many decks fail and i believe this to be the cause- treating the "minimum requirements" as the "standard". . . .
    Anyone reading my posts will know one of my mantras - minimum standards are not best practice - but standards are not a reason for deck failures. If that were the case then the rate of failure would be very high (it actually isn't) and the litigation rates high too (they aren't) and the standards would increased (they have been much the same for a long long time) as would compliance regimes.

    Catastrophic failures are almost always high decks (>2m) and always involve incorrect construction, (ie: NOT complying to the standard in part or full), or poor maintenance, or excessive load (often dynamic) - or some or all of those factors together. Most common if a relatively new deck is that it just been incorrectly attached (eg: simply dynabolted to a brick veneer wall) and then subjected to a dynamic heavy load - many people dancing or moving about. This ca happen once and a collapse or over a number of events that eventually leads to the collapse.

    The next most common cause is due to poor maintenance (or in the case of oregon/Douglas Fir for example a material that is very unforgiving of poor maintenance) and the application of the same type of load. Fine for years & years then the 21st birthday party or 50th or a family get together increases the load, often makes it dynamic and down it comes.

    That's why we have those minimum standards - but also why understanding about maintenance is important and when looking at renovating decks more than say 8-10 years old professional advice should be used on its soundness. These are general comments though - for there are higher risks in tropics and areas with higher rainfall when proper maintenance is not done. Ignorant or intentional sub-standard design &/or construction by professionals or DIYers can happen anywhere.

    The standards are fine - and the way the BCA operates there are higher compliance requirements for higher structures than lower (as consequences will be bigger) which is another reason we have few failures. So build beyond the standards to get a better quality result and probably greater longevity (if looked after) - including less bounce - but don't make decisions out of fear or worry about small probability risks . . .
    Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.

  13. #13
    Pulse's Avatar
    Pulse is offline 1K Club Member
    Join Date
    Jan 2005
    Location
    Newcastle
    Posts
    1,214

    Default

    Deck handrails structural requirements

    Cheers
    Pulse

  14. #14
    ptt102 is offline Novice
    Join Date
    May 2009
    Location
    Melbourne
    Posts
    34

    Default

    Which is the timber Solutions program this post refers to? The link points to timber.org web site with few different programs, but I am not sure which one is suitable for deck bearer and joist calculations.

    Thanks.

  15. #15
    bails74 is offline Apprentice (new member)
    Join Date
    Oct 2011
    Location
    Gosford
    Posts
    2

    Default

    sorry of this is the wrong way to do this, but I am about to build a deck for myself with a single 190 x45 bearer with posts at 1800mm, In your mind do you think this is okay or will it be too springy, too insufficient for strength/ span. Oh, it will cover 5.4x3m, with 2 rows of bearers.

  16. #16
    mrgee is offline Apprentice (new member)
    Join Date
    Dec 2010
    Location
    Sydney
    Posts
    8

    Default

    Where can I find hardwood span tables..?
    All posts listed in this thread seem to refer to pine or softwoods..?

  17. #17
    r3nov8or is offline Love a reno - 1k club member
    Join Date
    Jun 2010
    Location
    Geelong
    Posts
    1,868

    Default

    The official Standards Australia documents specify hardwood in terms of gradings, like F17. Programs like Timber Solutions can also specify hardwood

  18. #18
    DylanB is offline Novice
    Join Date
    Nov 2011
    Location
    Victoria
    Posts
    36

    Default

    Am i correct in thinking this Standard was updated in 2010?
    I cant find a free copy the outdoor treated pine under 1 metre section.


Similar Threads

  1. Very wide span tables
    By RumpledElf in forum STRUCTURAL RENOVATION
    Replies: 17
    Last Post: 22nd Feb 2010, 07:30 PM
  2. New verandah and span tables
    By ozizu in forum PERGOLAS - GAZEBOS- STROMBRELLAS-ROTUNDAS
    Replies: 3
    Last Post: 12th Oct 2009, 09:02 PM
  3. deciphering span tables
    By hobglob in forum STRUCTURAL RENOVATION
    Replies: 4
    Last Post: 7th Apr 2009, 06:04 AM
  4. BIG span tables needed.
    By Bleedin Thumb in forum SUB FLOORING
    Replies: 10
    Last Post: 10th Feb 2008, 12:37 AM
  5. span tables
    By dno in forum STRUCTURAL RENOVATION
    Replies: 4
    Last Post: 10th Oct 2007, 09:17 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Content Relevant URLs by vBSEO 3.5.2