Building Codes typically address membrane structures with a life of 180 days or more whereas Fire Codes address those with life expectancy of fewer than ___________ days.

• A. 90
• B. 120
• C. 360
• D. 180

Answer: (D)

The main idea is the regulatory boundary between permanent-like structures and temporary ones. If a membrane structure is planned to be in use for 180 days or more, it’s treated as a permanent building and falls under building codes. If its life expectancy is fewer than 180 days, it’s considered temporary and regulated by fire codes, which focus on temporary occupancy safety, egress, ignition sources, and fire protection. That’s why 180 days is the correct threshold. Using any other duration would misclassify the structure’s regulatory approach.