Solutions for 800mm floor joist centres?

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Hi,

I would like to lay a new floor covering in the first floor bedroom in our victorian terrace. The problem is that the 5x2 floor joists (actual size 120mm x 60mm) are at 800mm centres with no noggins and span roughly 2.4m.


Ideally I would make the structure better in order to accommodate a standard 18mm chipboard or floorboard covering. Will adding noggins suffice or will this put too much stress on the existing undersized joists?

Should I add more joists to the structure - which would be quite labour intensive and disruptive and involves cob walls?


What would everyone suggest.?
 
Can't see how it would add any more stress on the current joists?

Noggins should be fine. Don't use chipboard over the top, use ply.



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