I have a question about thermal blocks in multy family residential buildings.

I'm working with a building that has 4 floors and totly 7 appartments. Floor 1-3 have 2 appartments and the 4th floor has only 1 appartment. That means six of the appartments are facing three different orientations and one are facing four.

Is it okey to model every appartment as one thermal block even though the appartments are facing different orientations? I'm a little bit confused since Table G3.1 (8) says that a seperate zone shall be provided for every orientation. While Table G3.1 (9) says that one dwelling unit can be modelled as one thermal block.

To turn one appartment into several thermal blocks can in other cases end up with too many thermal blocks. Does anybody know which way that is the right one?

Thanks in advanced!