Adding extra joist and new hanger

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I am trying to gain as much usable space in a bedroom during a remodel. With a king sized bed in the room it is a bit of a squeeze to get past, so every inch counts :D

I am planning on adding an extra 8ft 3x8 joist so that I can move the stud wall back by 3 inches. The image below demonstrates where I am planning on adding this...

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My plan of action is going to be prop up the existing timber, remove the joist hangers and replace with new 150mm hangers to accommodate 2 3x8 timbers.

I have a few questions I am looking for some guidance on though...

  • Are there any weight concerns with adding an extra joist?
  • Are there specific double joist hangers, or do I just go with a single one with enough width to fit in 2 timbers?
  • What are the difference between face fix hangers and ones with a strap? Why would I choose one over the other and would either be suitable in this instance?
  • Should I also bolt the joists together?
It seems like a fairly straightforward job to do but wanted to check in to see if I am missing anything.
 
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If you're not adding any extra load, why do you need another 8x3 header? Can't you just add something like a 6x2 off bog standard face fix hangars and build the stud wall on that.
 
I want another 8x3 header as it will take up the extra space perfectly, there is a method to my madness :) Plus, I am unable to attach any new hangers as the existing flanges get in the way.
 
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My main question was one of weight though, is there any weight concerns adding another 3x8 timber to the setup?

I am pretty sure all would be fine but wanted to check in with people with more experience than me to see if anyone had any concerns with regards to loading.
 
Personally I can't see any major issues here. TBH how much is your extra 8 x 3 going to weigh? 30kg? 40kg? Maybe 50kg? Not a lot in the grand scheme of things when you consider how much weight there will be on the floor as a whole with two adults, furniture and clothes....
 

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