Sizing of floor joists

[rickard_t]

I'm going to install a new floor structure in an extension to my house. I've made a small sketch of how I plan to do it; see the attached file. Hopefully, it's understandable
The black marked beams are my support beams.
The section with 30cc is intended for a bathroom.

The question is what dimension is required for the floor joists?

 

[injonil]

Check out Träguiden's tables! With these spans, you can have a fairly light floor structure.

 

[rickard_t]

Do you have a link to that table? I can only find for 3m span and up!

 

[pbengtsson]

You will manage ex on 145x45, but it's a little too small for insulation, so go with the dimensions you intended to insulate.