If the foam insulation is 600mm wide, you should naturally have exactly 600mm BETWEEN the beams. This can get a bit confusing since a standard construction typically has a center-to-center distance of 600mm. This means the distance between beams becomes 555mm, which is the usual width for insulation. In your case, the center-to-center distance will instead be 645mm.

It doesn't matter too much as long as you don't plan to install other building materials with standard dimensions. If you try to, for example, install standard plywood sheets on the inside, they won't reach between the studs.
 
That product is probably not intended to be mounted between studs. Where they mention facade insulation, they are likely envisioning a continuous layer, for example, outside the stud framework.
 
CC600 on the studs and then you have to adjust the insulation. As mentioned, it becomes a H-E with anything related to sheet material otherwise.
 
Maybe a dumb question, but...... is it okay to insulate with foam plastic? I had the impression that it was not so good considering fire gases, etc.
 
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