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PostPosted: Mon Jan 08, 2018 7:18 pm 
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Coming to the end of designing the plans for my soon to be built timber shed. I'm now on to the plans for the roof, one thing that appears in many designs is that the timbers used for the rafters are fixed on their thinner side (sort of upright) like this http://rat-hole.blogspot.co.uk/2011/05/ ... aming.html

Could anyone enlighten me as to why this is? I'm using 2" x 3" can I not just fix the rafters on their 3" sides?

Thanks :-)


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PostPosted: Mon Jan 08, 2018 8:34 pm 
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Get something like the stick from an ice cream (or a ruler, or anything flat and wide) and place it on its side between two points and press down in the middle.
Then turn it to lay flat and try again....... you'll answer your question I expect.



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PostPosted: Mon Jan 08, 2018 8:39 pm 
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mike10 wrote:
Get something like the stick from an ice cream (or a ruler, or anything flat and wide) and place it on its side between two points and press down in the middle.
Then turn it to lay flat and try again....... you'll answer your question I expect.


Ah!...it won't flex when placed on its thin side as opposed to the wider side.


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PostPosted: Mon Jan 08, 2018 8:55 pm 
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There you go, you'll be a structural engineer soon :wink:


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PostPosted: Mon Jan 08, 2018 9:15 pm 
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mike10 wrote:
There you go, you'll be a structural engineer soon :wink:


...........and then those 3X2s will become 6X2s! :mrgreen:

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PostPosted: Mon Jan 08, 2018 9:25 pm 
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Of course there's always an exceprtion to a rule and it's not unknown to find rafters and joists wider than they are deep on old buildings. Mind the timbers are also larger in general rather than the 2" thickness common on newer buildings and also often not the cheap softwood we use nowadays too. I've fitted 6x4" oak rafters with the 6" face against the purlins. Although to be fair the reasoning behind this , as I was always taught, was nothing to do with strength but more because the use of cut nails and to a degree dowels exert a splitting force on thinner timbers.


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PostPosted: Tue Jan 09, 2018 10:56 am 
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mike10 wrote:
There you go, you'll be a structural engineer soon :wink:


Thanks for the vote of confidence, I'll let you know when I'm designing the new Fourth Bridge ;)


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