stud/noggin centres?

Hi,



This may seem like a strange question, I may be overthinking things......:~



If noggins are 450mm (or 600mm) why are Insulation Batts 430 & 580mm?



Is there supposed to be a 20mm gap or am I misunderstanding this.



I am making up some walls in my shed to make a room, I am using all 90x45 MGP10 Timbers and was going 450 centres/noggins.



I'm just a tad confused over the batt size or am I reading too much into it.....



Regards,



Col.





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