Noggins or Herringbone struts

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All,

Our upstairs floor does not feel stable under foot (3m span) and removing the ceiling downstairs for another job I found there are no noggins or struts between the joists. Am I best to install solid noggins or steel herringbone struts? I cannot install the struts on top of the joists as the flooring has not been removed above. Can I nail the struts to the side of the joists.

Many thanks
 
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make wooden ones and screw to the face

metal ones will probably just bend/flex with movement if nailed to the face
noggins will only work if you can square up the timbers or cut them individually to fit
 
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And dont forget that noggings or herringbone are useless without folding wedges between the last joist and wall.
 
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What section size are the joists?

Where the joists sit in the bearing wall pockets are they firmly wedged-in? ie. they dont spring up, even a small amount.
 
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