Final answer:
Each townhouse should be separated by a fire-resistant-rated wall assembly which is crucial for preventing the spread of fire and ensuring the safety of residents.
Step-by-step explanation:
The question pertains to construction specifications, more specifically to the type of wall assembly that should be used between townhouses to ensure fire safety. In this context, each townhouse is required to be separated by a fire-resistant-rated wall assembly. Such a wall is designed to prevent the spread of fire between units and must adhere to building codes and standards that specify the minimum fire-resistance rating.
The importance of fire-resistant materials and construction methods cannot be overstated, as they are crucial in protecting lives and property. For instance, materials like fiberglass, drywall, and insulated siding contribute to the overall ability of a wall assembly to resist the spread of fire. A higher R factor indicates better insulation, thus also improving the energy efficiency of the townhouses.