Is there a minimum length for floorboards?

[Gary111]

Hi, I am having to replace some slightly rotten floorboards that are supporting a stud wall and a bath.
Is there a minimum length that they need to be to support the weight or is it ok of they just run from one joist to the next?

Thanks

 

[blup]

Are you sure they support a stud wall, or do they butt up to them? A short floorboard is fine but make sure it sits on half the width of the joist, you could add a batten to increase the support if space permits. Try to spread the weight of the bath across several joists if you can.

Blup