OSB3 subfloor missing noggins

22 Jan 2023
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United Kingdom
I have been working to renovate my first home and had to replace an area of joists and floorboards on the ground floor with OSB3 18mm sheets

Since having the kitchen installed I have noticed the floor moves a bit under foot even when screwed down which is worst under the joints between the sheets which are not supported by noggins.

I am going to instal 15mm T&G oak flooring and was thinking if I should add some noggins to the osb sheets where foot traffic is (under units not needed as no one steps there

Would this be required/advisable? Or would the park snapping lengthways over the pan add strength to the floor?

Thanks you
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A floor shouldn't move, but you don't define how much 'a bit' is.

If you haven't screwed it down yet then that will add stiffness.
If you haven't already insulated under the floor then that would be a good incentive to add noggins.

If you or anyone else wanted to change to a tiled floor in the future, then the floor as it is won't be good enough to tile into.
You say you have unsupported joints.

Support them.
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18mm is a bit skinny for a floor. If the boards aren't T & G then all joints must be supported. If it's the joists flexing (not unusual) then nogging will help, props midspan will help more.

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