Physical Separation Between Different Hazards?

We have a project under NFPA 13 with different hazard classifications on the same floor. I’m designing a sprinkler system using the density/area method.

If different areas on the same floor have different occupancies and contents, for example, an OH1 workshop adjacent to an OH2 storage area, can the boundary between the two hazards be based simply on the different use/occupancy and materials present?

Or does NFPA 13 require a specific physical separation or fire-rated compartmentation between them in order to use different hazard classifications?

How stringent are these separation requirements?

​I’m not referring to the Room Design Method. Thanks in advance

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