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PostPosted: Mon Jan 29, 2018 1:25 pm 
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Hi All,

I wish to to move a floor joist in order to create an opening. The floor joists are 50x150 (or 2 x 6 inch) and were put in as part of a loft conversion. They are separate from the ceiling joists and are at a slightly higher level so any messing around will not affect the ceiling joists or roof members.

Please see the attached image. At the top is the external wall, the grey fill denotes load bearing elements which are the wall plate at the top, an internal load bearing wall at the bottom (where you can see joists overlapping) and a chunkY timber beam along the right of the page where you can see the direction of the joist change.

The dotted part show the extent of a single joist which I need to remove. I intend to install a new joist first (orange) which will span between walls and then cut the old joist and brace as show. This is with 2no. joist hangers and then coach screwed to the joist end which is spanning in the other direction.

I have seen that it is common to double up joists but i'm not sure if that is needed in this case. This is in an area of loft so nobody can walk directly over the affected area, the useable part of the room is a corridor over the internal wall. I could install the new joist tight up against the exiting joist to the left but that will open up a gap bigger than 450mm.

Any thoughts???


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PostPosted: Mon Jan 29, 2018 4:11 pm 
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I would move the new (orange) joist to the left to double that one, put in a double trimmer where you show a single, fit the new joist from the trimmer to the l/b wall at the bottom and then close the space down from the trimmer to the outside wall at the top to whatever dimension you want with another joist, (cut the old one carefully and it will do both pieces of the single joist - you've got the thickness of a double trimmer to play with as far as where you cut it initially).

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PostPosted: Mon Jan 29, 2018 5:03 pm 
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OK, do you mean like this? see attachment.

Also would you use joist hangers and coach screws a bit like i have shown?


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PostPosted: Mon Jan 29, 2018 6:07 pm 
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DIYnot23 wrote:
OK, do you mean like this? see attachment.

Also would you use joist hangers and coach screws a bit like i have shown?


That's it, you've got it.

We don't get much choice these days, everyone expects to see Jiffy hangers on a project like that. I'd probably not use them at home but if a Building Inspector ever saw it he'd want them.

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For this message the author ayjay has received gratitude : DIYnot23
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