Spacing of joists

[clairelouisecook]

I have exposed my joists which are 4" x 2" joists in the kitchen/hall which seem to be either 16" or 17" apart. I intend to put a wooden enginneered floor down on 18mm ply on part of the floor and tile again laid on 18mm ply on another bit of the floor. Are my joists too far apart such that I will get too much movement causing the tile flooring to break up. Advice would be welcome. I have a lot of wood worm in the house any recommendations on treatment. Thanks

 

[big-all]

i am assuming you have intermediate supports under the floor if they are 4x2" what is the span between supports!!!