Roof construction help please

In the US lumber comes in multiples of 4 feet.

I don't like to be the America-centric egotist who assumes that all countries do things the same way and I know you use metric so I didn't know if your lumber comes in multiples of 4 feet or multiples of a meter or what. :D
Ah, gotcha.
For measuring length, height and weight, we generally use imperial. Don't ask me why.
 

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