NCIDQ Interior Design Professional Exam (IDPX) Practice Exam 2026 - Free Interior Design Practice Questions and Study Guide

A wall that separates two buildings and provides joint service is classified as a firewall. Firewalls are designed to prevent the spread of fire between buildings and are typically constructed to withstand fire exposure for a specified period, depending on the building codes and the type of occupancy. They extend continuously from the foundation to the roof and are essential for ensuring compliance with safety standards, particularly in densely populated areas or where buildings are located close together.

The primary purpose of a firewall is to create a barrier that can withstand fire for a specific duration, which is typically established by fire codes, ensuring that even if one building catches fire, the firewall will provide adequate protection to the adjacent building for that duration. This allows for safe egress and protects property and life. Understanding the importance of firewalls is crucial for interior designers when planning and designing spaces in compliance with safety regulations.