Section R302.2 is titled 'Townhouses' and covers the requirements for fire-resistant construction between townhouse units (referred to as 'attached dwellings'). The purpose of this section is to slow the spread of fire, heat, and smoke between adjacent townhouse units.
The model shows an x-ray of the skin of a three-unit townhouse, with the solid barriers showing the walls between units that must be constructed of a fire-resistant assembly.