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 Post subject: Joist hangers
PostPosted: Wed Dec 20, 2017 12:44 pm 
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Hi

Can some one help me out with joist hangers and wood size ? I want to put up 4 more joists in my garage roof to support a new roof as the current ones are quite widely spaced. I'm thinking I need 47mm x 100mm wood. I need a masonary face fixed joist hanger but they all seem to come in widths of 50mm? is this the right size or will it be too loose ?

Any comments greatly appreciated.


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 Post subject: Re: Joist hangers
PostPosted: Wed Dec 20, 2017 1:09 pm 
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Sawn timber used to be 50mm (2" really) but is often about 44/45mm these days, joist hangers just haven't caught up. On the odd occasion that one gets a decent sized piece of timber of course one is grateful for that.

It'll be fine, pack it out with some suitable sized plywood if you're worried about it.

Is this a flat roof that just needs a bit more support?

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 Post subject: Re: Joist hangers
PostPosted: Wed Dec 20, 2017 4:26 pm 
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As ajay has said Stress Grading produces sizes a few mm's less than standard sizes we were used to.
I have usually ripped down 'packings' on the saw to suit and pin them to the joist ends. You will find this takes out all the 'sloppy' fit!

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 Post subject: Re: Joist hangers
PostPosted: Wed Dec 20, 2017 4:28 pm 
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You do get hangers that take c16(sized) 45mm timber.


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 Post subject: Re: Joist hangers
PostPosted: Wed Dec 20, 2017 5:13 pm 
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Your right Stevie, but they are not always stocked by some of our Merchants, particularly if your rural! Ours offer 50mm and 75mm.
Even on-line, some popular suppliers don't offer 45mm hangers.


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 Post subject: Re: Joist hangers
PostPosted: Wed Dec 20, 2017 7:43 pm 
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Find a Simpson Strongtie stockist - they seem to carry (or can supply) most sizes, both traditional and "modern"

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 Post subject: Re: Joist hangers
PostPosted: Thu Dec 21, 2017 7:29 am 
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If they are like "Simpson strong tie" masonry to wood hangers, they will have three or four screw holes in the side so you can tighten up the joist, at least my 200x80s did. Nos


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 Post subject: Re: Joist hangers
PostPosted: Thu Dec 21, 2017 5:11 pm 
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You should use twist nails and not screws on joist hangers - they are far less likely to shear if shock loaded

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 Post subject: Re: Joist hangers
PostPosted: Thu Dec 21, 2017 6:24 pm 
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:withstupid:
Screws are a no-no on joist-jiffy hangers.
You do get high tensile screws designed for hangers but they aren’t readily available and are costly.


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 Post subject: Re: Joist hangers
PostPosted: Fri Dec 22, 2017 8:18 am 
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I didn't know that, :oops: thanks. Good job it burnt down then, :roll: Nos


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 Post subject: Re: Joist hangers
PostPosted: Fri Dec 22, 2017 10:39 am 
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If you have a keen building inspector they really will pull screwed hangers. They will also pull hangers where there aren't nails in at least 75% of the holes - manufacturers spec is for 100% nailed. My understanding is that they work on the basis of a large percentage factor of "over engineering" being able to withstand extreme loadings, etc

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