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Thread: Bearers joists span tables etc
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13th November 2005, 08:46 PM #16Originally Posted by ThePope"If something is really worth doing, it is worth doing badly." - GK Chesterton
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14th November 2005, 12:37 PM #17Senior Member
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Originally Posted by Terrian
Check out the cost comparisons, because I'd just spend the extra money and get the manufactured joists that will span the full distance - probably at 300 centres or therebouts, you can certainly span 6m using only 350 depth, which is neat easy, check the cch site out for it.
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15th November 2005, 09:19 AM #18Member
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- Sep 2002
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Hi Peter
I have a copy of my plan with the decking area sketched in. How can I get this to you? Could you send me a pm with an email address?
Regards
Ash
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7th December 2005, 06:13 PM #19
For those interested in Span tables, check out the free programs available from Hyne Timber (Design in Hyne) and Carter Harvey Holt (DesignIT). I found DesignIT to be user friendly and you can deisgn in a range of soft and hardwoods as well as their engineered products such as Hyspan LVL and Hybeam. It was 39mb to download (including Microsoft .NET program), 17Mb if you already have .Net
You can order the programs on a CD if your connection is slow. I still downloaded the program using dialup whilst I watched a DVD!"If something is really worth doing, it is worth doing badly." - GK Chesterton
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30th July 2007, 11:54 PM #20New Member
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- Jul 2007
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- queensland
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Timber spans
Hi Peter,
I am building a 5m wide deck out the back of my house by 7.6m long (the 5m width is perpendicular to my house slab/wall. I propose to use treated pine size 140*45 for the bearers and joists. According to the new tables and technical note 1, I can get away with spans of 2.2m for F5 (single span) and 2.3m for F7 single span. i sthis correct!
or 2.6m for F5 (continous span) and 2.8m for F7 (continous span)!
I am approx 0.5m above ground and propose to bolt a waling plate size 140*45 to my house slab/wall which the bearers can be connected to, the next support will be 2.250 meters away and then another set of supports 2.250m away follwed by a 500mm cantilever. The joists will then be at 450mm centres. For the supports I am looking to use a 300mm concrete foundation formed by using a 300m pipe as a sleeve.
Are the timber sizes I proposed okay for both the bearers and the joists?and is this a single span or continous because the first connection is bolted to the waling plate. any comments would be greatly appreciated.
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30th July 2007, 11:58 PM #21New Member
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- Jul 2007
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- queensland
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- 2
span sizes etc
I am building a 5m wide deck out the back of my house by 7.6m long (the 5m width is perpendicular to my house slab/wall. I propose to use treated pine size 140*45 for the bearers and joists. According to the new tables and technical note 1, I can get away with spans of 2.2m for F5 (single span) and 2.3m for F7 single span. i sthis correct!
or 2.6m for F5 (continous span) and 2.8m for F7 (continous span)!
I am approx 0.5m above ground and propose to bolt a waling plate size 140*45 to my house slab/wall which the bearers can be connected to, the next support will be 2.250 meters away and then another set of supports 2.250m away follwed by a 500mm cantilever. The joists will then be at 450mm centres. For the supports I am looking to use a 300mm concrete foundation formed by using a 300m pipe as a sleeve.
Are the timber sizes I proposed okay for both the bearers and the joists?and is this a single span or continous because the first connection is bolted to the waling plate. any comments would be greatly appreciated.
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1st August 2007, 04:25 PM #22Intermediate Member
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- Jul 2007
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- Brisbane Australia
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I thought those books got canned when they amalgamated to the 2006 AS for timber.
I bought a copy of the standard and have all the spans etc. What I can't find is useable information on what diagonal bracing is requried in the legs. The deck will be on a high set qld house, wrapped around one corner (L shaped). It's basically a 10X13L that is 4.5m deep. Any suggestions appreciated. I want to minimise the diagonal bracing on the legs.
Thanx
Paul
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1st August 2007, 08:18 PM #23
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1st August 2007, 08:59 PM #24SENIOR MEMBER
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That looks like a handy tool. I'd imagine that engineers wouldn't be too happy about it.
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23rd January 2008, 02:08 PM #25Novice
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- Dec 2007
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- Australia
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You may be regretting ever saying those imortal words of anybody needing any help....
I really would appreciate some guidance - I bought the Allan Staines book on decks and pergolas and the book contains the spanning tables however I must be losing the plot as I cannot make heads or tails about what he is talking about.
The top column is the size of bearers for bearer span. This gives you distances from 1200-3000 (I am assuming that this is the maximum distance of the piece of timber from start to finish). Please tell me if I am wrong. The vertical column to the left of the table denotes the "Load Width" - whats this all about? Is it the maximum gap between posts allowed? Likewise if you have a value for instance 2/120*45 I am assuming this requires 2 pieces of timber either side of the post?
I really could do with somebody telling me the following based on my attached drawing of how I want to lay my deck out:
How far apart do my posts need to be from each other?
What size ledger do I need to secure to the wall to rest my joists on to?
What size bearer timber do I need?
What size joist timber do I need to span 5.4m?
If nobody can tell me answers to this question maybe they can give me an idiots guide on how to work the tables so as I can calculate myself? Any assistance would really be appreciated.
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23rd January 2008, 02:24 PM #26
Span is the distance that the bearer must span - ie the distance between posts or other supports. It's usually given as two sets of figures: single span where the bearer spans only two posts - it is supported only at the ends; and continuous span in which the bearer spans at least three posts or supports.
Without having the table in front of me, I can only assume that by Load Width he is referring to the spacing of the bearers - which in turn gives the span of the joists. The wider the spacing, the heavier the bearers need to be because each is carrying proportionally more weight.
How far apart your posts need to be is a factor of the bearer size you select. The full length of the bearer is immaterial in this because using the continuous span sizes, you could theoretically make a deck of infinite width, as long as individual spans between posts were within the specified distance. Likewise for joists. You select the joist to suit your bearer spacing. The closer the bearer spacing, the lighter the joist required."I don't practice what I preach because I'm not the kind of person I'm preaching to."
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