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Floor load width just means bearer spacing?

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  1. #1
    Apprentice (new member)
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    Default Floor load width just means bearer spacing?

    trying to get use to using the span table book, i was confused on how i know what spacings my posts are suppose to span.
    so if my floor load width is for example 1800 is that the spacing what my bearers should be? and then in the span table under 1800 FLW then i see what timber i should use to span longways? then find the joist that will span over the 1800 bearers.
    am i on the right track?

  2. #2
    Building Designer ausdesign's Avatar
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    If you provide a sketch it may make it easier.
    The bearer span - non-loadbearing - (single or continuous) is determined from the floor load width (FLW) which for an external bearer will be half the joist span. For an internal bearer - which I assume you aren't after - it is the half span load in both directions.
    Peter Clarkson

    www.ausdesign.com.au

    This information is intended to provide general information only.
    It does not purport to be a comprehensive advice.

  3. #3
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    naa no sketch its not for anything in particular, i am just trying to figure out to the australian standards how do i determine post spacings for what size bearers and joists ect, i have the pocket span table book and like it says for the FLW its half span in both directions so does that mean my post spacings are that far apart? internal and external if you get my drift. cheers

  4. #4
    Building Designer ausdesign's Avatar
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    The bearer span, which is the stump or post spacing, is determined by A - the roof load width in conjunction with the floor load width or by B - for a bearer supporting floor loads only, the bearer spacing i.e. the joist span.
    Does that make sense ?
    Peter Clarkson

    www.ausdesign.com.au

    This information is intended to provide general information only.
    It does not purport to be a comprehensive advice.

  5. #5
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    im looking in my span book so for example, my floor load width is 1800, so does that mean that stumps for my bearers are 1800 apart and then i use my table with the RLW to determine the spacings for the posts going the other direction? If deciding to build a new home or large deck what would i do to detearmine my bearer spacings? or can you just choose any FLW you want and just use the appropiate bearers to suit.
    so whats the difference between choosing the FLW of 1800 to say 3600, would it just be bigger stump spacings for bearers but obiously a larger timber used for the bearer

  6. #6
    2K Club Member barney118's Avatar
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    confusing, you need to design joist and bearers separately.
    Your FLW is a function of your joist span so if your FLW is 1800 then your joist span should be 3600mm. Your bearer span is calculated by your FLW this is the max span between posts/piers/stump. so your 1800 FLW table will have either single span or continuous span between bearers.
    You need to select the right table for your bearer span, ie > or< 1m off the ground single span or continuous span.

  7. #7
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    now i am defenetly confused with what i have got my self into. how about ill start from the start and see how that goes?
    for example if i am about to build a house 13000 x 10000, the only load bearing walls being external and its compleatly rectangular.
    how would you go about working out proper stump spaces bearers and joists. all in order haa cheers guys
    i have only ever worked on a slab and im sure that at some point im going to have to come across this especially for decks as well

  8. #8
    2K Club Member barney118's Avatar
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    Download design IT fro free it solves a lot of issues CHH Australia - DesignIT. I would be using LVL's and wood I beams for joist if building a house. You can change your spans and have an answer straight away. Ie you could use bearers for single storey home hyspan 150x 75mm and span 2m between posts/stumps- 2 on the outside one in the middle@ 5m assuming trussed roof sheet not tile. The beauty of these product you can get long lengths and they are straight as. You must have a slope if not going for a slab.

  9. #9
    Old Chippy - 4K Club Member
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    Or go to Bricklayer's site and just plug in your numbers.
    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.

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